BMW X5 2000-05

Camshaft, Bearings & Lifters

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Removal & Installation



3.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the camshaft (Double VANOS) adjustment unit as follows:
    1. Remove the intake filter housing with Mass Air Flow (MAF) sensor.
    2.  
    3. Remove the fan impeller with fan clutch and cowl.
    4.  
    5. Remove the cylinder head covers.
    6.  
    7. Remove the spark plugs.
    8.  
    9. Remove the plastic cover for intake camshaft.
    10.  
    11. Remove the oil pressure pipe.
    12.  
    13. Install a special tool, 11-3-450, with banjo bolt on oil pressure connection unit.
    14.  
    15. Cover the camshaft adjustment unit.
    16.  
    17. Connect a compressed air hose to the special tool fitting on the oil line connection.
    18.  
    19. Rotate the engine, a least 2 turns in direction of rotation, to return the camshafts to TDC position (front cam lobes pointing to 10 o-clock and 2 o-clock positions).
    20.  
    21. Install a special locking tool, 11-2-300, into hole to lock flywheel in TDC position.
    22.  
    23. Remove the 2 studs from the rear of the cylinder head outer edge. Secure the camshafts with locking tools, 11-2-240.
    24.  
    25. Disconnect the compressed air hose from the special tool.
    26.  
    27. Using care so no oil drips onto belt drive, remove the screw plugs from the camshaft adjustment unit cover corresponding to the forward ends of the camshafts. Have a container to catch oil that runs out.
    28.  
    29. Using short, flat nose pliers, remove sealing caps through screw plug openings, then remove the fitting screws (left-hand thread) from both camshaft forward ends.
    30.  
    31. Detach the plug connection from the camshaft sensor and solenoid valves on both camshafts.
    32.  
    33. Remove the engine lifting eye from the camshaft adjustment unit cover.
    34.  
    35. Remove nuts and remove the camshaft adjustment unit
    36.  

  6.  


WARNING
Once camshaft adjust unit is removed, DO NOT crank engine. The toothed shaft on the intake side camshaft may slip out of the spline teeth and valves could rest of the piston.



Click image to see an enlarged view

Fig. Attaching compressed air hose to oil line connector-3.0L engines



Click image to see an enlarged view

Fig. Showing location of retaining nuts on camshaft adjustment unit (Double VANOS)-3.0L engines

  1. Remove the cylinder for the chain tensioning piston. Use caution as piston is under spring pressure.
  2.  
  3. Press down on the secondary chain tensioner at the top and lock the chain in place with a special tool, 11-3-292.
  4.  
  5. Remove or disconnect the following:

    Sensor gear from exhaust camshaft
     
    Spring plate from behind sensor gear
     
    Nuts on intake camshaft and remove corrugated washer
     
    Screws from chain gear on exhaust camshaft
     
    Toothed shaft with sleeve
     
    Secondary (upper) chain tensioner
     
    Release screw-in pins from exhaust camshaft chain gear
     
    Exhaust camshaft chain gear (leave chain on end of camshaft)
     
    Thrust washer on intake camshaft
     
    Intake camshaft sensor gear
     

  6.  


CAUTION
DO NOT release screws from front ends of either camshaft.



Studs from between both camshafts
 

  1. Release the special locking tool so flywheel is free.
  2.  
  3. Lift the timing chain off from end of exhaust camshaft and hold it under tension by lifting it straight up.
  4.  
  5. Rotate the engine against the normal direction of rotation about 30 degrees, using the crankshaft bolt.
  6.  


CAUTION
To prevent the intake camshaft from moving the bearing inserts, remove the camshaft no. 1 bearing cap nuts and remove the bearing cap.

  1. Install a special tool, 11-2-260, to the cylinder head and install retaining bolts into tool and into spark plug holes for cylinders no.1 and no. 4.
  2.  
  3. Turn the eccentric shaft of the special tool to pre-tension the bearing caps. Remove the nuts on all bearing caps.
  4.  
  5. Relieve the tension from the eccentric shaft of the special tool and remove the tool.
  6.  
  7. Remove the bearing caps and keep in order as removed.
  8.  
  9. Remove the camshaft. Repeat the process for the other camshaft.
  10.  


NOTE
If cylinder head is to be removed, remove the complete bearing strip with the bucket tappets. Keep in order of original locations.



Click image to see an enlarged view

Fig. Installing special tool to pre-tension camshaft bearing caps for removal-3.0L engines

To install:

  1. Check bearing points of bucket tappets for signs of scoring.
  2.  


NOTE
Bearing strips are marked -A- for exhaust side and -E- for intake side.

  1. Be sure centering dowels are in place on retaining pins at bearing points 2 and 7.
  2.  
  3. Install the bearing strips.
  4.  
  5. Oil all teeth, camshafts, bearings, bearing caps, and friction washers before installation.
  6.  


CAUTION
Bucket tappets expand when not subjected to load by the camshaft and therefore require some time before they can be pushed back down. During a rapid assembly sequence, the -closed- valves may still be open and therefore be in contact with the piston. After assembly, wait at least 30 minutes before cranking the engine back to the TDC position.

  1. Pull up the timing chain and feed in the exhaust camshaft. Position the timing chain onto the end of the exhaust camshaft.
  2.  


CAUTION
To prevent damaging valves when fitting camshafts, no pistons should be in TDC position.

  1. Install the camshafts so the cam tips on the intake and exhaust valves on no. 1 cylinder face each other at about the 10 o-clock and 2 o-clock positions.
  2.  
  3. Install the bearing caps (caps are marked from the exhaust side, A1 through A7 for the exhaust side, and E1 through E7 for the intake side).
  4.  
  5. Install the special tool, 11-3-260, onto the cylinder head as during removal.
  6.  
  7. Turn the eccentric shaft to pre-tension the bearing caps. Tighten the bearing cap bolts as follows:
    1. M6 bolts: 7 ft. lbs. (10 Nm).
    2.  
    3. M7 bolts: 10 ft. lbs. (14 Nm).
    4.  
    5. M8 bolts: 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Remove the special tool.
  10.  
  11. Install camshaft locking tools, 11-3-240 on back end of camshafts. Use an open-end wrench to align camshafts (if necessary, machine wrench head so it does not contact cylinder head) so there is no gap at the locking tools.
  12.  
  13. Install the middle locking tool, 11-3-244 so it adjoins other tools and is bolted into spark plug hole.
  14.  
  15. Lift the timing chain straight up off the exhaust camshaft and hold it under tension.
  16.  
  17. Rotate the engine from 30 degrees BTDC to TDC, in normal direction of rotation.
  18.  
  19. Using special tool, 11-2-300, lock flywheel in this position.
  20.  
  21. Install sensor gear onto intake camshaft. Install the thrust washer over the sensor gear and torque the gear screw-in pins to 15 ft. lbs. (20 Nm).
  22.  
  23. Feed the chain wheel onto the timing chain so the arrow on the chain wheel faces the upper edge of the cylinder head.
  24.  
  25. Install a special tool, 11-4-220 into the cylinder head in the chain tensioning piston bore and bring tool adjustment screw into contact with the timing chain tensioning rail, but no further at this time.
  26.  
  27. Check the arrow mark on the chain wheel and adjust if needed so it still points to upper edge of the cylinder head.
  28.  
  29. Install and tighten the retaining screw-in pins in the exhaust chain wheel to 15 ft. lbs. (20 Nm).
  30.  
  31. Install the secondary (upper) chain tensioner.
  32.  
  33. Position the toothed sleeve into the exhaust camshaft to the toothed gaps are opposed. Secure the toothed shaft. Insert the pin of the toothed shaft into the tooth gaps of the splines on the camshaft and toothed sleeve.
  34.  
  35. Push in the toothed shaft on the exhaust camshaft until the elongated holes in the tooth sleeve wheel are centered over the bolt holes.
  36.  
  37. Place forward chain wheels onto special tool, 116-6-180, and position tooth gap on intake chain wheel as shown as feed on the timing chain.
  38.  


    Click image to see an enlarged view

    Fig. Setting timing chain and chain wheel mark in position during installation of chain-3.0L engines



    Click image to see an enlarged view

    Fig. Aligning forward timing chain on chain wheels with special tool-3.0L engines



CAUTION
DO NOT alter position of chain wheels and chain when removing the special tool.

  1. Remove the special tool and position chain wheels on camshafts, so that tooth spaces oppose each other on intake camshaft.
  2.  
  3. Align chain with sprocket wheels so tooth spaces are positioned exactly over each other on intake side.
  4.  
  5. Install and secure the toothed shaft into the tooth gaps of the splines of the camshaft and chain wheel. Push in the toothed shaft until about 0.4 inch (1 mm) of splines can still be seen.
  6.  
  7. Note the installation direction of the corrugated washed so -FRONT- is visible. Install the washer and tighten retaining nuts snug only at this time.
  8.  
  9. Install 4 bolts on exhaust side to retain chain wheel. Initially tighten to about 3 ft. lbs. (5 Nm), then slack off one-half turn.
  10.  
  11. Install the thrust washer over the exhaust side chain wheel.
  12.  
  13. Note the installation direction of the cup spring (2) so the -F- stamp is forward. If -F- is no longer visible on used engine, install the cup spring so the small locating diameter of the spring points to the sensor gear. Install the cup spring.
  14.  
  15. Position the sensor gear over the cup spring so the arrow on the sensor gear is in line with the upper edge of the cylinder head. Install retaining nuts but do not fully tighten.
  16.  
  17. Pull out the exhaust side toothed shaft to the stop.
  18.  
  19. Press down the secondary chain tensioner at the top and remove the special locking tool.
  20.  
  21. Use a special tool, 11-4-200, to preload timing chain tensioning rail by rotating the adjusting screws of the tool with a small wrench.
  22.  
  23. Preload the exhaust side cup spring slightly be pressing on the sensor gear and hand-tighten the gear retaining nuts (do not fully tighten yet).
  24.  
  25. Remove any remaining gasket material from mating face on front of cylinder head.
  26.  
  27. Check dowel sleeves for damage and for correct installation position.
  28.  
  29. Make sure sealing face is clean and free of oil.
  30.  
  31. Fit special tool, 11-6-150 without gasket over both toothed shafts. Tighten retaining nuts to hold tool in place. Hand-tighten only until special tool is uniformly in contact with cylinder head.
  32.  
  33. Insert bolts on exhaust side chain wheel and tighten to about 3 ft. lbs. (5 Nm).
  34.  
  35. Initially tighten nuts on both exhaust and intake chain wheels to about 3 ft. lbs. (5 Nm).
  36.  
  37. Torque bolts on exhaust chain wheel to 15 ft. lbs. (20 Nm).
  38.  
  39. Torque nuts on exhaust and intake chain wheels screw-in pins to 7 ft. lbs. (10 Nm).
  40.  
  41. Pull back the special tool from the flywheel.
  42.  
  43. Remove the special tools from the rear of the camshafts.
  44.  
  45. Crank the engine twice in the direction of rotation until the cam lobe tips on the front of the camshafts point inward at about the 10 o-clock and 2 o-clock positions.
  46.  
  47. Lock the flywheel with the special tool to the crankshaft is at Top Dead Center (TDC) position.
  48.  


    Click image to see an enlarged view

    Fig. Installing the cup spring on the exhaust camshaft chain wheel-3.0L engines



WARNING
DO NOT turn the engine against normal rotation.

  1. Install the special camshaft locking tool, 11-3-240, onto rear end of camshafts to hold its position.
  2.  


NOTE
The camshaft timing is correctly set if the special tool rests on the camshafts without a gap on the cylinder head or any protrusion up to 0.04 inch (1 mm) on the intake side.

  1. Remove the special tool from the camshaft forward ends.
  2.  
  3. Install the camshaft adjustment (Double VANOS) unit as follows:
    1. Ensure dowel sleeves on forward mating face of cylinder head are not damaged and are correctly installed.
    2.  
    3. Keep sealing faces clean and free of oil.
    4.  
    5. Apply a thin and even coat of sealing compound, Drei Bond 1209, to contact surface edges of the separating face between the cylinder head and the camshaft adjustment unit.
    6.  
    7. Install or connect the following:
    8.  



    New seal on mating face
     
    Camshaft adjustment unit
     
    Screws for hydraulic pistons on toothed shaft end on both camshafts (through front openings); torque to 7 ft. lbs. (10 Nm). Screws have left-hand threads.
     
    Sealing caps into camshaft adjustment unit openings
     
    Screw plugs, with new seal rings; torque to 37 ft. lbs. (50 Nm)
     
    Engine lifting eye
     

  4.  
  5. Set camshaft timing, if necessary.
  6.  
  7. Complete installation in reverse of removal procedure.
  8.  

  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the camshaft (Double VANOS) adjustment unit as follows:
    1. Remove the intake filter housing with Mass Air Flow (MAF) sensor.
    2.  
    3. Remove the fan impeller with fan clutch and cowl.
    4.  
    5. Remove the cylinder head covers.
    6.  
    7. Remove the spark plugs.
    8.  
    9. Remove the plastic cover for intake camshaft.
    10.  
    11. Remove the oil pressure pipe.
    12.  
    13. Install a special tool, 11-3-450, with banjo bolt on oil pressure connection unit.
    14.  
    15. Cover the camshaft adjustment unit.
    16.  
    17. Connect a compressed air hose to the special tool fitting on the oil line connection.
    18.  
    19. Rotate the engine, a least 2 turns in direction of rotation, to return the camshafts to TDC position (front cam lobes pointing to 10 o-clock and 2 o-clock positions).
    20.  
    21. Install a special locking tool, 11-2-300, into hole to lock flywheel in TDC position.
    22.  
    23. Remove the 2 studs from the rear of the cylinder head outer edge. Secure the camshafts with locking tools, 11-2-240.
    24.  
    25. Disconnect the compressed air hose from the special tool.
    26.  
    27. Using care so no oil drips onto belt drive, remove the screw plugs from the camshaft adjustment unit cover corresponding to the forward ends of the camshafts. Have a container to catch oil that runs out.
    28.  
    29. Using short, flat nose pliers, remove sealing caps through screw plug openings, then remove the fitting screws (left-hand thread) from both camshaft forward ends.
    30.  
    31. Detach the plug connection from the camshaft sensor and solenoid valves on both camshafts.
    32.  
    33. Remove the engine lifting eye from the camshaft adjustment unit cover.
    34.  
    35. Remove nuts and remove the camshaft adjustment unit
      WARNING
      Once camshaft adjust unit is removed, DO NOT crank engine. The toothed shaft on the intake side camshaft may slip out of the spline teeth and valves could rest of the piston.



      Click image to see an enlarged view

      Fig. Attaching compressed air hose to oil line connector-3.0L engines



      Click image to see an enlarged view

      Fig. Showing location of retaining nuts on camshaft adjustment unit (Double VANOS)-3.0L engines

    36.  

  6.  
  7. Remove the cylinder for the chain tensioning piston. Use caution as piston is under spring pressure.
  8.  
  9. Press down on the secondary chain tensioner at the top and lock the chain in place with a special tool, 11-3-292.
  10.  
  11. Remove or disconnect the following:
    CAUTION
    DO NOT release screws from front ends of either camshaft.



    Sensor gear from exhaust camshaft
     
    Spring plate from behind sensor gear
     
    Nuts on intake camshaft and remove corrugated washer
     
    Screws from chain gear on exhaust camshaft
     
    Toothed shaft with sleeve
     
    Secondary (upper) chain tensioner
     
    Release screw-in pins from exhaust camshaft chain gear
     
    Exhaust camshaft chain gear (leave chain on end of camshaft)
     
    Thrust washer on intake camshaft
     
    Intake camshaft sensor gear
     



    Studs from between both camshafts
     

  12.  
  13. Release the special locking tool so flywheel is free.
  14.  
  15. Lift the timing chain off from end of exhaust camshaft and hold it under tension by lifting it straight up.
  16.  
  17. Rotate the engine against the normal direction of rotation about 30 degrees, using the crankshaft bolt.
    CAUTION
    To prevent the intake camshaft from moving the bearing inserts, remove the camshaft no. 1 bearing cap nuts and remove the bearing cap.

  18.  
  19. Install a special tool, 11-2-260, to the cylinder head and install retaining bolts into tool and into spark plug holes for cylinders no.1 and no. 4.
  20.  
  21. Turn the eccentric shaft of the special tool to pre-tension the bearing caps. Remove the nuts on all bearing caps.
  22.  
  23. Relieve the tension from the eccentric shaft of the special tool and remove the tool.
  24.  
  25. Remove the bearing caps and keep in order as removed.
  26.  
  27. Remove the camshaft. Repeat the process for the other camshaft.
    NOTE
    If cylinder head is to be removed, remove the complete bearing strip with the bucket tappets. Keep in order of original locations.



    Click image to see an enlarged view

    Fig. Installing special tool to pre-tension camshaft bearing caps for removal-3.0L engines

  28.  

To install:

  1. Check bearing points of bucket tappets for signs of scoring.
    NOTE
    Bearing strips are marked -A- for exhaust side and -E- for intake side.

  2.  
  3. Be sure centering dowels are in place on retaining pins at bearing points 2 and 7.
  4.  
  5. Install the bearing strips.
  6.  
  7. Oil all teeth, camshafts, bearings, bearing caps, and friction washers before installation.
    CAUTION
    Bucket tappets expand when not subjected to load by the camshaft and therefore require some time before they can be pushed back down. During a rapid assembly sequence, the -closed- valves may still be open and therefore be in contact with the piston. After assembly, wait at least 30 minutes before cranking the engine back to the TDC position.

  8.  
  9. Pull up the timing chain and feed in the exhaust camshaft. Position the timing chain onto the end of the exhaust camshaft.
    CAUTION
    To prevent damaging valves when fitting camshafts, no pistons should be in TDC position.

  10.  
  11. Install the camshafts so the cam tips on the intake and exhaust valves on no. 1 cylinder face each other at about the 10 o-clock and 2 o-clock positions.
  12.  
  13. Install the bearing caps (caps are marked from the exhaust side, A1 through A7 for the exhaust side, and E1 through E7 for the intake side).
  14.  
  15. Install the special tool, 11-3-260, onto the cylinder head as during removal.
  16.  
  17. Turn the eccentric shaft to pre-tension the bearing caps. Tighten the bearing cap bolts as follows:
    1. M6 bolts: 7 ft. lbs. (10 Nm).
    2.  
    3. M7 bolts: 10 ft. lbs. (14 Nm).
    4.  
    5. M8 bolts: 15 ft. lbs. (20 Nm).
    6.  

  18.  
  19. Remove the special tool.
  20.  
  21. Install camshaft locking tools, 11-3-240 on back end of camshafts. Use an open-end wrench to align camshafts (if necessary, machine wrench head so it does not contact cylinder head) so there is no gap at the locking tools.
  22.  
  23. Install the middle locking tool, 11-3-244 so it adjoins other tools and is bolted into spark plug hole.
  24.  
  25. Lift the timing chain straight up off the exhaust camshaft and hold it under tension.
  26.  
  27. Rotate the engine from 30 degrees BTDC to TDC, in normal direction of rotation.
  28.  
  29. Using special tool, 11-2-300, lock flywheel in this position.
  30.  
  31. Install sensor gear onto intake camshaft. Install the thrust washer over the sensor gear and torque the gear screw-in pins to 15 ft. lbs. (20 Nm).
  32.  
  33. Feed the chain wheel onto the timing chain so the arrow on the chain wheel faces the upper edge of the cylinder head.

    Click image to see an enlarged view

    Fig. Setting timing chain and chain wheel mark in position during installation of chain-3.0L engines

  34.  
  35. Install a special tool, 11-4-220 into the cylinder head in the chain tensioning piston bore and bring tool adjustment screw into contact with the timing chain tensioning rail, but no further at this time.
  36.  
  37. Check the arrow mark on the chain wheel and adjust if needed so it still points to upper edge of the cylinder head.
  38.  
  39. Install and tighten the retaining screw-in pins in the exhaust chain wheel to 15 ft. lbs. (20 Nm).
  40.  
  41. Install the secondary (upper) chain tensioner.
  42.  
  43. Position the toothed sleeve into the exhaust camshaft to the toothed gaps are opposed. Secure the toothed shaft. Insert the pin of the toothed shaft into the tooth gaps of the splines on the camshaft and toothed sleeve.
  44.  
  45. Push in the toothed shaft on the exhaust camshaft until the elongated holes in the tooth sleeve wheel are centered over the bolt holes.
  46.  
  47. Place forward chain wheels onto special tool, 116-6-180, and position tooth gap on intake chain wheel as shown as feed on the timing chain.
    CAUTION
    DO NOT alter position of chain wheels and chain when removing the special tool.



    Click image to see an enlarged view

    Fig. Aligning forward timing chain on chain wheels with special tool-3.0L engines

  48.  
  49. Remove the special tool and position chain wheels on camshafts, so that tooth spaces oppose each other on intake camshaft.
  50.  
  51. Align chain with sprocket wheels so tooth spaces are positioned exactly over each other on intake side.
  52.  
  53. Install and secure the toothed shaft into the tooth gaps of the splines of the camshaft and chain wheel. Push in the toothed shaft until about 0.4 inch (1 mm) of splines can still be seen.
  54.  
  55. Note the installation direction of the corrugated washed so -FRONT- is visible. Install the washer and tighten retaining nuts snug only at this time.
  56.  
  57. Install 4 bolts on exhaust side to retain chain wheel. Initially tighten to about 3 ft. lbs. (5 Nm), then slack off one-half turn.
  58.  
  59. Install the thrust washer over the exhaust side chain wheel.
  60.  
  61. Note the installation direction of the cup spring (2) so the -F- stamp is forward. If -F- is no longer visible on used engine, install the cup spring so the small locating diameter of the spring points to the sensor gear. Install the cup spring.

    Click image to see an enlarged view

    Fig. Installing the cup spring on the exhaust camshaft chain wheel-3.0L engines

  62.  
  63. Position the sensor gear over the cup spring so the arrow on the sensor gear is in line with the upper edge of the cylinder head. Install retaining nuts but do not fully tighten.
  64.  
  65. Pull out the exhaust side toothed shaft to the stop.
  66.  
  67. Press down the secondary chain tensioner at the top and remove the special locking tool.
  68.  
  69. Use a special tool, 11-4-200, to preload timing chain tensioning rail by rotating the adjusting screws of the tool with a small wrench.
  70.  
  71. Preload the exhaust side cup spring slightly be pressing on the sensor gear and hand-tighten the gear retaining nuts (do not fully tighten yet).
  72.  
  73. Remove any remaining gasket material from mating face on front of cylinder head.
  74.  
  75. Check dowel sleeves for damage and for correct installation position.
  76.  
  77. Make sure sealing face is clean and free of oil.
  78.  
  79. Fit special tool, 11-6-150 without gasket over both toothed shafts. Tighten retaining nuts to hold tool in place. Hand-tighten only until special tool is uniformly in contact with cylinder head.
  80.  
  81. Insert bolts on exhaust side chain wheel and tighten to about 3 ft. lbs. (5 Nm).
  82.  
  83. Initially tighten nuts on both exhaust and intake chain wheels to about 3 ft. lbs. (5 Nm).
  84.  
  85. Torque bolts on exhaust chain wheel to 15 ft. lbs. (20 Nm).
  86.  
  87. Torque nuts on exhaust and intake chain wheels screw-in pins to 7 ft. lbs. (10 Nm).
  88.  
  89. Pull back the special tool from the flywheel.
  90.  
  91. Remove the special tools from the rear of the camshafts.
  92.  
  93. Crank the engine twice in the direction of rotation until the cam lobe tips on the front of the camshafts point inward at about the 10 o-clock and 2 o-clock positions.
  94.  
  95. Lock the flywheel with the special tool to the crankshaft is at Top Dead Center (TDC) position.
    WARNING
    DO NOT turn the engine against normal rotation.

  96.  
  97. Install the special camshaft locking tool, 11-3-240, onto rear end of camshafts to hold its position.
    NOTE
    The camshaft timing is correctly set if the special tool rests on the camshafts without a gap on the cylinder head or any protrusion up to 0.04 inch (1 mm) on the intake side.

  98.  
  99. Remove the special tool from the camshaft forward ends.
  100.  
  101. Install the camshaft adjustment (Double VANOS) unit as follows:
    1. Ensure dowel sleeves on forward mating face of cylinder head are not damaged and are correctly installed.
    2.  
    3. Keep sealing faces clean and free of oil.
    4.  
    5. Apply a thin and even coat of sealing compound, Drei Bond 1209, to contact surface edges of the separating face between the cylinder head and the camshaft adjustment unit.
    6.  
    7. Install or connect the following:

      New seal on mating face
       
      Camshaft adjustment unit
       
      Screws for hydraulic pistons on toothed shaft end on both camshafts (through front openings); torque to 7 ft. lbs. (10 Nm). Screws have left-hand threads.
       
      Sealing caps into camshaft adjustment unit openings
       
      Screw plugs, with new seal rings; torque to 37 ft. lbs. (50 Nm)
       
      Engine lifting eye
       

    8.  

  102.  
  103. Set camshaft timing, if necessary.
  104.  
  105. Complete installation in reverse of removal procedure.
  106.  

4.4L (M62) & 4.6L Engines
Left Camshaft (Cylinder Bank 5-8)
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Splash guard
     
    Left and right cylinder head covers
     
    Spark plugs
     
    Timing chain tensioning piston
     
    Top left timing case cover
     
    Left camshaft adjustment unit and distributor
     
    Oil lines to the left and right cylinder head
     

  4.  
  5. Install special tool 11-2-300 and pull back on it until the flywheel is no longer secured in position.
  6.  
  7. Lift the timing chain and hold it under tension.
  8.  
  9. Crank the engine counter-engine wise on the central screw into the 45° Before Top Dead Center (BTDC) position.
  10.  
  11. Rotate the exhaust camshaft at the hex head until the cam at cylinder No. 6 faces upward.
  12.  
  13. Rotate the inlet camshaft at the hex head until the cam at cylinder No. 8 faces upward.
  14.  
  15. Evenly release the bearing covers on the exhaust and inlet camshafts in 1 / 2 turn steps from the outside working in.
  16.  
  17. Remove the bearing covers and remove the camshafts.
  18.  
  19. Remove the hydraulic valve lifters. To remove, use tool No. 11-3-250 to pull them out of the cylinder head. Be sure that no damage occurs to the guides in the head. Inspect the bearing surfaces of the tappets for wear and scoring.
  20.  

To install:

  1. If the lifters were removed, install them with tool No. 11-32-250.
  2.  
  3. Lubricate and install the camshafts in their correct position.
  4.  
  5. Install or connect the following:

    Exhaust and inlet camshafts and rotate them until exhaust cam at cylinder No. 6 faces up and inlet cam at cylinder No. 8 faces up
     
    Bearing caps. The exhaust camshaft bearing covers are marked A1 to A5 and the inlet covers are marked E1 to E5. Evenly tighten the bearing covers in 1 / 2 turn steps from the outside working in.
     

  6.  
  7. Torque the camshaft bearing covers as follows:
    1. M6 to 89 inch lbs. (10 Nm).
    2.  
    3. M7 to 9 ft. lbs. (14 Nm).
    4.  
    5. M8 to 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Rotate the camshafts until the markings face upwards.
  10.  
  11. Using special tools 11-2-446 and 11-2-442 align the inlet and exhaust camshafts with an open-end wrench so the tools rest without a gap on the cylinder head.
  12.  
  13. Crank the engine from the 45 degrees BTDC position in the direction of rotation up to the TDC position.
  14.  
  15. Hold the crankshaft and install the distributor on the camshaft adjustment unit.
  16.  
  17. Install or connect the following:

    Camshaft adjustment unit
     
    Left timing case cover
     
    Timing chain tensioning piston
     
    Spark plugs
     
    Cylinder head covers
     
    Splash guard
     
    Negative battery cable
     

  18.  

4.4L (N62) & 4.8L Engines
Left Exhaust
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the acoustic cover and ignition coil cover.
  4.  
  5. Disconnect the electrical connector on the servomotor.
  6.  
  7. Unbolt and remove the servomotor.
  8.  
  9. Remove the ignition coils. For additional information, please refer to the following topic: -Ignition Coils, Removal & Installation-.
  10.  
  11. Remove the spark plugs.
  12.  
  13. Remove the cylinder head cover. For additional information, please refer to the following topic: -Cylinder Head Covers, Removal & Installation-.
  14.  
  15. Remove the upper timing chain cover.
  16.  
  17. Remove the intake and exhaust adjustment unit.
  18.  
  19. Remove the slide rail.
  20.  
  21. Rotate the camshaft at the hexagonal head until the cam lobe on the 6th cylinder is facing upwards.
  22.  
  23. Remove the nuts and remove bearing cap RA1.
  24.  
  25. Remove the nuts and remove the bearing caps RA2 through RA5.
  26.  
  27. Remove the exhaust camshaft.
  28.  

To install:

  1. Lubricate the bearing caps and exhaust camshaft journals with clean engine oil.
  2.  
  3. Install the exhaust camshaft. Rotate until the exhaust cam on the 6th cylinder is facing upwards.
  4.  
  5. Install bearing caps RA2 through RA5. Make sure the retaining clips for the oil line are fitted on the bearing caps 3 and 5. Hand tighten the caps at first and then tighten in 1 / 2 turn increments evenly from the inside to the outside.
  6.  
  7. Install bearing cap RA1.
  8.  
  9. Install the slide rail with a new gasket.
  10.  
  11. Rotate the camshaft against the direction of rotation until the cam lobe on the 5th cylinder points upwards.
  12.  
  13. The remainder of the installation is the reverse order of removal.
  14.  

Left Intake
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the acoustic cover and ignition coil cover.
  4.  
  5. Disconnect the electrical connector on the servomotor.
  6.  
  7. Unbolt and remove the servomotor.
  8.  
  9. Remove the ignition coils. For additional information, please refer to the following topic: -Ignition Coils, Removal & Installation-.
  10.  
  11. Remove the spark plugs.
  12.  
  13. Remove the cylinder head cover. For additional information, please refer to the following topic: -Cylinder Head Covers, Removal & Installation-.
  14.  
  15. Remove the upper timing chain cover.
  16.  
  17. Remove the intake and exhaust adjustment unit.
  18.  
  19. Rotate the intake camshaft against the direction of rotation until the lettering on the 8th cylinder points upwards and cam is horizontal.
  20.  
  21. Remove the nuts and remove bearing cap RE1.
  22.  
  23. Remove the eight nuts of the bearing bracket from the outside to the inside
  24.  
  25. Clamp Special Tool 11-9-470 in a vice to accept the bearing bracket.
  26.  
  27. Carefully lift out the bearing bracket and place on Special Tool 11-9-470 and secure with a nut.
  28.  
  29. Remove the intermediate levers and torsion springs on each cylinder as follows:
    1. Raise one end of the torsion spring with Special Tool 11-9-480.
    2.  
    3. Left out the intermediate lever.
      NOTE
      Keep all valvetrain components in order for reinstallation is the same position.

    4.  
    5. Attach Special Tool 11-9-490 to the end of the torsion spring and support it on the intake camshaft.
    6.  
    7. Raise the second end of the torsion spring with Special Tool 11-9-480. Remove the intermediate lever.
    8.  
    9. Attach Special Tool 11-9-490 to the second end of the torsion spring and support it on the intake camshaft.
    10.  
    11. Remove the center bolt securing the torsion spring and remove the torsion spring assembly.
    12.  
    13. Repeat this procedure for the remaining cylinders.
    14.  

  30.  
  31. Remove the bearing cap nuts and remove the bearing caps.
    NOTE
    Keep the bearing caps in order for reinstallation.

  32.  
  33. Remove the intake camshaft.
  34.  

To install:

  1. Install the camshaft into the bearing bracket so the 5th cylinder cam lobes point upward.
  2.  
  3. Ensure the bearing shells of the eccentric shaft are engaged in the bearing bracket.
  4.  
  5. Install the bearing caps in the correct order.
  6.  
  7. Hand tighten all of the bearing cap nuts, then tighten the nuts using Special Tool 11-9-473.
  8.  
  9. Install Special Tool 11-9-472 to the bearing bracket and align the intake camshaft.
  10.  
  11. Fit the centering sleeves and align Special Tool 11-9-472 to bearing caps 2 and 3.
  12.  
  13. Install Special Tool 11-9-474 and tighten so there is no play.
    NOTE
    These alignment tools stay in place while the torsion springs and intermediate levers are being installed.

  14.  
  15. Install the torsion springs and intermediate levers in the reverse order they were removed, using Special Tools 11-9-480 and 11-9-490.
  16.  
  17. Remove the camshaft alignment tools.
  18.  
  19. Remove the bearing bracket from Special Tool 11-9-470.
  20.  
  21. Without tilting the bearing bracket assembly, slowly lower the bearing bracket and carefully bring it into contact with the cylinder head. Install the bearing bracket nuts and hand tighten. Then tighten the bearing bracket nuts from the inside to the outside.
  22.  
  23. Install bearing cap RE1 and tighten the nuts.
  24.  
  25. Rotate the camshaft in the direction of rotation until the marking on the hex portion of the camshaft faces upwards.
  26.  
  27. The remainder of the installation is the reverse order of removal.
  28.  

Right Exhaust
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the acoustic cover and ignition coil cover.
  4.  
  5. Disconnect the electrical connector on the servomotor.
  6.  
  7. Unbolt and remove the servomotor.
  8.  
  9. Remove the ignition coils. For additional information, please refer to the following topic: -Ignition Coils, Removal & Installation-.
  10.  
  11. Remove the spark plugs.
  12.  
  13. Remove the cylinder head cover. For additional information, please refer to the following topic: -Cylinder Head Covers, Removal & Installation-.
  14.  
  15. Remove the upper timing chain cover.
  16.  
  17. Remove the intake and exhaust adjustment unit.
  18.  
  19. Remove the slide rail.
  20.  
  21. Rotate the camshaft at the hexagonal head until the cam lobe on the 2nd cylinder is facing upwards.
  22.  
  23. Remove the nuts and remove bearing cap LA1.
  24.  
  25. Remove the nuts and remove the bearing caps LA2 through LA5.
  26.  
  27. Remove the exhaust camshaft.
  28.  

To install:

  1. Lubricate the bearing caps and exhaust camshaft journals with clean engine oil.
  2.  
  3. Install the exhaust camshaft. Rotate until the exhaust cam lobe on the 2nd cylinder is facing upwards.
  4.  
  5. Install bearing caps LA2 through LA5. Make sure the retaining clips for the oil line are fitted on the bearing caps 3 and 5. Hand tighten the caps at first and then tighten in 1 / 2 turn increments evenly from the inside to the outside.
  6.  
  7. Install bearing cap LA1.
  8.  
  9. Install the slide rail with a new gasket.
  10.  
  11. Rotate the camshaft against the direction of rotation until the cam lobe on the 1st cylinder points upwards.
  12.  
  13. The remainder of the installation is the reverse order of removal.
  14.  

Right Intake
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the acoustic cover and ignition coil cover.
  4.  
  5. Disconnect the electrical connector on the servomotor.
  6.  
  7. Unbolt and remove the servomotor.
  8.  
  9. Remove the ignition coils. For additional information, please refer to the following topic: -Ignition Coils, Removal & Installation-.
  10.  
  11. Remove the spark plugs.
  12.  
  13. Remove the cylinder head cover. For additional information, please refer to the following topic: -Cylinder Head Covers, Removal & Installation-.
  14.  
  15. Remove the upper timing chain cover.
  16.  
  17. Remove the intake and exhaust adjustment unit.
  18.  
  19. Rotate the intake camshaft against the direction of rotation until the cam love on the 1st cylinder is positioned horizontally.
  20.  
  21. Remove the nuts and remove bearing cap LE1.
  22.  
  23. Remove the eight nuts of the bearing bracket from the outside to the inside
  24.  
  25. Clamp Special Tool 11-9-470 in a vice to accept the bearing bracket.
  26.  
  27. Carefully lift out the bearing bracket and place on Special Tool 11-9-470 and secure with a nut.
  28.  
  29. Remove the intermediate levers and torsion springs on each cylinder as follows:
    1. Raise one end of the torsion spring with Special Tool 11-9-480.
    2.  
    3. Left out the intermediate lever.
      NOTE
      Keep all valvetrain components in order for reinstallation is the same position.

    4.  
    5. Attach Special Tool 11-9-490 to the end of the torsion spring and support it on the intake camshaft.
    6.  
    7. Raise the second end of the torsion spring with Special Tool 11-9-480. Remove the intermediate lever.
    8.  
    9. Attach Special Tool 11-9-490 to the second end of the torsion spring and support it on the intake camshaft.
    10.  
    11. Remove the center bolt securing the torsion spring and remove the torsion spring assembly.
    12.  
    13. Repeat this procedure for the remaining cylinders.
    14.  

  30.  
  31. Remove the bearing cap nuts and remove the bearing caps.
    NOTE
    Keep the bearing caps in order for reinstallation.

  32.  
  33. Remove the intake camshaft.
  34.  

To install:

  1. Install the camshaft into the bearing bracket so the 4th cylinder cam lobes point upward.
  2.  
  3. Ensure the bearing shells of the eccentric shaft are engaged in the bearing bracket.
  4.  
  5. Install the bearing caps in the correct order.
  6.  
  7. Hand tighten all of the bearing cap nuts, then tighten the nuts using Special Tool 11-9-473.
  8.  
  9. Install Special Tool 11-9-472 to the bearing bracket and align the intake camshaft.
  10.  
  11. Fit the centering sleeves and align Special Tool 11-9-472 to bearing caps 2 and 3.
  12.  
  13. Install Special Tool 11-9-474 and tighten so there is no play.
    NOTE
    These alignment tools stay in place while the torsion springs and intermediate levers are being installed.

  14.  
  15. Install the torsion springs and intermediate levers in the reverse order they were removed, using Special Tools 11-9-480 and 11-9-490.
  16.  
  17. Remove the camshaft alignment tools.
  18.  
  19. Remove the bearing bracket from Special Tool 11-9-470.
  20.  
  21. Without tilting the bearing bracket assembly, slowly lower the bearing bracket and carefully bring it into contact with the cylinder head. Install the bearing bracket nuts and hand tighten. Then tighten the bearing bracket nuts from the inside to the outside.
  22.  
  23. Install bearing cap LE1 and tighten the nuts.
  24.  
  25. Rotate the camshaft against the direction of rotation until the markings on the 1st cylinder hexagonal portion face upwards.
  26.  
  27. The remainder of the installation is the reverse order of removal.
  28.  

Left Camshaft (Cylinder Bank 5-8)-4.4L & 4.6L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Splash guard
     
    Left and right cylinder head covers
     
    Spark plugs
     
    Timing chain tensioning piston
     
    Top left timing case cover
     
    Left camshaft adjustment unit and distributor
     
    Oil lines to the left and right cylinder head
     

  4.  
  5. Install special tool 11-2-300 and pull back on it until the flywheel is no longer secured in position.
  6.  
  7. Lift the timing chain and hold it under tension.
  8.  
  9. Crank the engine counter-engine wise on the central screw into the 45° Before Top Dead Center (BTDC) position.
  10.  
  11. Rotate the exhaust camshaft at the hex head until the cam at cylinder No. 6 faces upward.
  12.  
  13. Rotate the inlet camshaft at the hex head until the cam at cylinder No. 8 faces upward.
  14.  
  15. Evenly release the bearing covers on the exhaust and inlet camshafts in12
  16.  
  17. Remove the bearing covers and remove the camshafts.
  18.  
  19. Remove the hydraulic valve lifters. To remove, use tool No. 11-3-250 to pull them out of the cylinder head. Be sure that no damage occurs to the guides in the head. Inspect the bearing surfaces of the tappets for wear and scoring.
  20.  

To install:

  1. If the lifters were removed, install them with tool No. 11-32-250.
  2.  
  3. Lubricate and install the camshafts in their correct position.
  4.  
  5. Install or connect the following:

    Exhaust and inlet camshafts and rotate them until exhaust cam at cylinder No. 6 faces up and inlet cam at cylinder No. 8 faces up
     
    Bearing caps. The exhaust camshaft bearing covers are marked A1 to A5 and the inlet covers are marked E1 to E5. Evenly tighten the bearing covers in12
     

  6.  
  7. Torque the camshaft bearing covers as follows:
    1. M6 to 89 inch lbs. (10 Nm).
    2.  
    3. M7 to 9 ft. lbs. (14 Nm).
    4.  
    5. M8 to 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Rotate the camshafts until the markings face upwards.
  10.  
  11. Using special tools 11-2-446 and 11-2-442 align the inlet and exhaust camshafts with an open-end wrench so the tools rest without a gap on the cylinder head.
  12.  
  13. Crank the engine from the 45 degrees BTDC position in the direction of rotation up to the TDC position.
  14.  
  15. Hold the crankshaft and install the distributor on the camshaft adjustment unit.
  16.  
  17. Install or connect the following:

    Camshaft adjustment unit
     
    Left timing case cover
     
    Timing chain tensioning piston
     
    Spark plugs
     
    Cylinder head covers
     
    Splash guard
     
    Negative battery cable
     

  18.  

Left Camshaft (Cylinder Bank 5-8)
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Splash guard
     
    Left and right cylinder head covers
     
    Spark plugs
     
    Timing chain tensioning piston
     
    Top left timing case cover
     
    Left camshaft adjustment unit and distributor
     
    Oil lines to the left and right cylinder head
     

  4.  
  5. Install special tool 11-2-300 and pull back on it until the flywheel is no longer secured in position.
  6.  
  7. Lift the timing chain and hold it under tension.
  8.  
  9. Crank the engine counter-engine wise on the central screw into the 45 degrees Before Top Dead Center (BTDC) position.
  10.  
  11. Rotate the exhaust camshaft at the hex head until the cam at cylinder No. 6 faces upward.
  12.  
  13. Rotate the inlet camshaft at the hex head until the cam at cylinder No. 8 faces upward.
  14.  
  15. Evenly release the bearing covers on the exhaust and inlet camshafts in 1 / 2 turn steps from the outside working in.
  16.  
  17. Remove the bearing covers and remove the camshafts.
  18.  
  19. Remove the hydraulic valve lifters. To remove, use tool No. 11-3-250 to pull them out of the cylinder head. Be sure that no damage occurs to the guides in the head. Inspect the bearing surfaces of the tappets for wear and scoring.
  20.  

To install:

  1. If the lifters were removed, install them with tool No. 11-32-250.
  2.  
  3. Lubricate and install the camshafts in their correct position.
  4.  
  5. Install or connect the following:

    Exhaust and inlet camshafts and rotate them until exhaust cam at cylinder No. 6 faces up and inlet cam at cylinder No. 8 faces up
     
    Bearing caps. The exhaust camshaft bearing covers are marked A1 to A5 and the inlet covers are marked E1 to E5. Evenly tighten the bearing covers in 1 / 2 turn steps from the outside working in.
     

  6.  
  7. Torque the camshaft bearing covers as follows:
    1. M6 to 89 inch lbs. (10 Nm).
    2.  
    3. M7 to 9 ft. lbs. (14 Nm).
    4.  
    5. M8 to 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Rotate the camshafts until the markings face upwards.
  10.  
  11. Using special tools 11-2-446 and 11-2-442 align the inlet and exhaust camshafts with an open-end wrench so the tools rest without a gap on the cylinder head.
  12.  
  13. Crank the engine from the 45 degrees BTDC position in the direction of rotation up to the TDC position.
  14.  
  15. Hold the crankshaft and install the distributor on the camshaft adjustment unit.
  16.  
  17. Install or connect the following:

    Camshaft adjustment unit
     
    Left timing case cover
     
    Timing chain tensioning piston
     
    Spark plugs
     
    Cylinder head covers
     
    Splash guard
     
    Negative battery cable
     

  18.  

Right Camshaft (Cylinder Bank 1-4)
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Splash guard
     
    Left and right cylinder head covers
     
    Spark plugs
     
    Timing chain tensioning piston
     
    Top right timing case cover
     
    Right camshaft adjustment unit and distributor
     
    Oil lines to the left and right cylinder head
     

  4.  
  5. Install special tool 11-2-300 and pull back on it until the flywheel is no longer secured in position.
  6.  
  7. Lift the timing chain and hold it under tension.
  8.  
  9. Crank the engine counter-engine wise on the central screw into the 45 degrees Before Top Dead Center (BTDC) position.
  10.  
  11. Rotate the exhaust camshaft at the hex head until the cam at cylinder No. 6 faces upward.
  12.  
  13. Rotate the inlet camshaft at the hex head until the cam at cylinder No. 8 faces upward.
  14.  
  15. Evenly release the bearing covers on the exhaust and inlet camshafts in12
  16.  
  17. Remove the bearing covers and remove the camshafts.
  18.  
  19. Remove the hydraulic valve lifters. To remove, use tool No. 11-3-250 to pull them out of the cylinder head. Be sure that no damage occurs to the guides in the head. Inspect the bearing surfaces of the tappets for wear and scoring.
  20.  

To install:

  1. If the lifters were removed, install them with tool No. 11-32-250.
  2.  
  3. Lubricate and install the camshafts in their correct position.
  4.  
  5. Install or connect the following:

    Exhaust and inlet camshafts and rotate them until exhaust cam at cylinder No. 6 faces up and inlet cam at cylinder No. 8 faces up
     
    Bearing caps. The exhaust camshaft bearing covers are marked A1 to A5 and the inlet covers are marked E1 to E5. Evenly tighten the bearing covers in12
     

  6.  
  7. Torque the camshaft bearing covers as follows:
    1. M6 to 89 inch lbs. (10 Nm).
    2.  
    3. M7 to 9 ft. lbs. (14 Nm).
    4.  
    5. M8 to 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Rotate the camshafts until the markings face upwards.
  10.  
  11. Using special tools 11-2-446 and 11-2-442 align the inlet and exhaust camshafts with an open-end wrench so the tools rest without a gap on the cylinder head.
  12.  
  13. Crank the engine from the 45 degrees BTDC position in the direction of rotation up to the TDC position.
  14.  
  15. Hold the crankshaft and install the distributor on the camshaft adjustment unit.
  16.  
  17. Install or connect the following:

    Camshaft adjustment unit
     
    Both timing case covers
     
    Timing chain tensioning piston
     
    Spark plugs
     
    Cylinder head covers
     
    Splash guard
     
    Negative battery cable
     

  18.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Splash guard
     
    Left and right cylinder head covers
     
    Spark plugs
     
    Timing chain tensioning piston
     
    Top right timing case cover
     
    Right camshaft adjustment unit and distributor
     
    Oil lines to the left and right cylinder head
     

  4.  
  5. Install special tool 11-2-300 and pull back on it until the flywheel is no longer secured in position.
  6.  
  7. Lift the timing chain and hold it under tension.
  8.  
  9. Crank the engine counter-engine wise on the central screw into the 45 degrees Before Top Dead Center (BTDC) position.
  10.  
  11. Rotate the exhaust camshaft at the hex head until the cam at cylinder No. 6 faces upward.
  12.  
  13. Rotate the inlet camshaft at the hex head until the cam at cylinder No. 8 faces upward.
  14.  
  15. Evenly release the bearing covers on the exhaust and inlet camshafts in 1 / 2 turn steps from the outside working in.
  16.  
  17. Remove the bearing covers and remove the camshafts.
  18.  
  19. Remove the hydraulic valve lifters. To remove, use tool No. 11-3-250 to pull them out of the cylinder head. Be sure that no damage occurs to the guides in the head. Inspect the bearing surfaces of the tappets for wear and scoring.
  20.  

To install:

  1. If the lifters were removed, install them with tool No. 11-32-250.
  2.  
  3. Lubricate and install the camshafts in their correct position.
  4.  
  5. Install or connect the following:

    Exhaust and inlet camshafts and rotate them until exhaust cam at cylinder No. 6 faces up and inlet cam at cylinder No. 8 faces up
     
    Bearing caps. The exhaust camshaft bearing covers are marked A1 to A5 and the inlet covers are marked E1 to E5. Evenly tighten the bearing covers in 1 / 2 turn steps from the outside working in.
     

  6.  
  7. Torque the camshaft bearing covers as follows:
    1. M6 to 89 inch lbs. (10 Nm).
    2.  
    3. M7 to 9 ft. lbs. (14 Nm).
    4.  
    5. M8 to 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Rotate the camshafts until the markings face upwards.
  10.  
  11. Using special tools 11-2-446 and 11-2-442 align the inlet and exhaust camshafts with an open-end wrench so the tools rest without a gap on the cylinder head.
  12.  
  13. Crank the engine from the 45 degrees BTDC position in the direction of rotation up to the TDC position.
  14.  
  15. Hold the crankshaft and install the distributor on the camshaft adjustment unit.
  16.  
  17. Install or connect the following:

    Camshaft adjustment unit
     
    Both timing case covers
     
    Timing chain tensioning piston
     
    Spark plugs
     
    Cylinder head covers
     
    Splash guard
     
    Negative battery cable
     

  18.  

  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Splash guard
     
    Left and right cylinder head covers
     
    Spark plugs
     
    Timing chain tensioning piston
     
    Top right timing case cover
     
    Right camshaft adjustment unit and distributor
     
    Oil lines to the left and right cylinder head
     

  4.  
  5. Install special tool 11-2-300 and pull back on it until the flywheel is no longer secured in position.
  6.  
  7. Lift the timing chain and hold it under tension.
  8.  
  9. Crank the engine counter-engine wise on the central screw into the 45 degrees Before Top Dead Center (BTDC) position.
  10.  
  11. Rotate the exhaust camshaft at the hex head until the cam at cylinder No. 6 faces upward.
  12.  
  13. Rotate the inlet camshaft at the hex head until the cam at cylinder No. 8 faces upward.
  14.  
  15. Evenly release the bearing covers on the exhaust and inlet camshafts in 1 / 2 turn steps from the outside working in.
  16.  
  17. Remove the bearing covers and remove the camshafts.
  18.  
  19. Remove the hydraulic valve lifters. To remove, use tool No. 11-3-250 to pull them out of the cylinder head. Be sure that no damage occurs to the guides in the head. Inspect the bearing surfaces of the tappets for wear and scoring.
  20.  

To install:

  1. If the lifters were removed, install them with tool No. 11-32-250.
  2.  
  3. Lubricate and install the camshafts in their correct position.
  4.  
  5. Install or connect the following:

    Exhaust and inlet camshafts and rotate them until exhaust cam at cylinder No. 6 faces up and inlet cam at cylinder No. 8 faces up
     
    Bearing caps. The exhaust camshaft bearing covers are marked A1 to A5 and the inlet covers are marked E1 to E5. Evenly tighten the bearing covers in 1 / 2 turn steps from the outside working in.
     

  6.  
  7. Torque the camshaft bearing covers as follows:
    1. M6 to 89 inch lbs. (10 Nm).
    2.  
    3. M7 to 9 ft. lbs. (14 Nm).
    4.  
    5. M8 to 15 ft. lbs. (20 Nm).
    6.  

  8.  
  9. Rotate the camshafts until the markings face upwards.
  10.  
  11. Using special tools 11-2-446 and 11-2-442 align the inlet and exhaust camshafts with an open-end wrench so the tools rest without a gap on the cylinder head.
  12.  
  13. Crank the engine from the 45 degrees BTDC position in the direction of rotation up to the TDC position.
  14.  
  15. Hold the crankshaft and install the distributor on the camshaft adjustment unit.
  16.  
  17. Install or connect the following:

    Camshaft adjustment unit
     
    Both timing case covers
     
    Timing chain tensioning piston
     
    Spark plugs
     
    Cylinder head covers
     
    Splash guard
     
    Negative battery cable
     

  18.  

 
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