Lexus GS, SC 1998-06

Camshaft, Bearings & Lifters 4

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Removal & Installation



3MZ-FE Engines


Click image to see an enlarged view

Fig. Exploded view Intake Manifold-3.3L (3MZ-FE)Engine



Before servicing the vehicle, refer to the Precautions section.
 
Remove or disconnect the following:
  1. Negative battery cable. Wait at least 90 seconds before performing any other work
  2.  
  3. RH front wheel
  4.  
  5. Front suspension upper brace center
  6.  
  7. V-bank cover sub-assembly
  8.  
  9. Air cleaner assembly
  10.  
  11. Emission control valve set
  12.  
  13. Intake air surge tank
  14.  
  15. Ignition coil assembly
  16.  
  17. Cylinder head valve covers
  18.  
  19. Front fender apron seal
  20.  
  21. A/C Compressor and PS drive belts
  22.  
  23. Engine stabilizing rod
  24.  
  25. Engine mounting stay
  26.  
  27. Alternator bracket
  28.  
  29. Crankshaft pulley
  30.  
  31. Timing belt covers
  32.  
  33. Timing belt, tensioners, idlers and guides
  34.  
  35. Camshaft timing pulleys
  36.  

 


NOTE
Align the camshaft pulleys so that they can be returned to the original locations when reassembling.



Inner timing belt cover
 


WARNING
Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being removed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break.



Remove the camshaft using the following procedures
 
RH bank camshaft No.1 & LH bank camshaft No.2
  1. Align the (2 dot marks) of the camshaft drive and driven gear by turning the camshaft with a wrench.
  2.  


    Click image to see an enlarged view

    Fig. Aligning timing marks-3.3L (3MZ-FE) Engine

  3. Secure the exhaust camshaft sub gear to the main gear with service bolt. Torque to 48 inch lbs. (5.4 Nm)
  4.  

 


NOTE
When removing the camshaft, make certain that the torsional spring force of the sub gear has been eliminated by installation of the service bolt.

  1. Using several steps, loosen the 10 bearing cap bolts uniformly in the sequence shown in the illustration. Remove the 5 bearing caps and camshaft
  2.  



Click image to see an enlarged view

Fig. Camshaft bolt removal sequence Camshaft No.1-3.3L (3MZ-FE) Engine



Click image to see an enlarged view

Fig. Camshaft bolt removal sequence Camshaft No.2 -3.3L (3MZ-FE) Engine



Click image to see an enlarged view

Fig. Camshaft bolt removal sequence Camshaft No.4 -3.3L (3MZ-FE) Engine


WARNING
Do Not pry out camshaft


WARNING
Do Not damage contact surface of the cylinder head that receives the shaft thrust.

  1. LH bank camshaft No. 3 & No. 4
    1. Using several steps, loosen the 10 bearing cap bolts uniformly in the sequence shown in the illustration. Remove the 5 bearing caps and camshaft Camshaft bolt removal sequence Camshaft No. 3-3.3L (3MZ-FE) Engine
    2.  



    Click image to see an enlarged view

    Fig.



    Click image to see an enlarged view

    Fig. Camshaft bolt removal sequence Camshaft No. 4-3.3L (3MZ-FE) Engine

  2.  


WARNING
Do Not pry out camshaft


WARNING
Do Not damage contact surface of the cylinder head that receives the shaft thrust.

  1. Remove the oil seal from camshaft
  2.  

To install:

  1. Install RH No 2 Camshaft then RH Camshaft No. 1 using same procedure
  2.  


WARNING
Since the clearance of the camshaft is small, the camshaft must be kept level while bring installed. If the camshaft is not kept level, the cylinder head or camshaft may be damaged.

  1. Apply engine oil to the thrust portion and journal of camshaft
  2.  
  3. No. 2 camshaft at 90 degree angel to the timing mark (2 dot marks) on the head.
  4.  
  5. Multi-purpose grease to new oil seal
  6.  
  7. Oil seal to camshaft
  8.  


NOTE
Do NOT turn over the oil seal lip


NOTE
Insert oil seal until it stops

  1. Seal packing to bearing cap No. 1
  2.  


NOTE
Install bearing cap No. 1 within 5 minutes after applying seal packing


NOTE
Do NOT expose seal packing to engine oil within 2 hours after installation

  1. 5 bearing caps in their proper locations
  2.  
  3. Apply light coat of oil to the threads of the bearing caps
  4.  
  5. Tighten the 10 bearing cap bolts in required sequence. Torque to: 12 ft. lbs. (16 Nm)
  6.  

  1. Install LH camshaft No.3 and LH camshaft No. 4 using the above procedure
  2.  
  3. Install or connect the following:
    1. Inner timing belt cover
    2.  
    3. RH then LH camshaft timing pulleys. Torque to: 92 ft. lbs. (125 Nm)
    4.  
    5. Timing belt idlers, tensioners, guide and belt
    6.  
    7. RH engine mounting bracket
    8.  
    9. Timing belt covers
    10.  
    11. Crankshaft pulley
    12.  
    13. Alternator bracket
    14.  
    15. RH engine mounting stay
    16.  
    17. Engine stabilizing rod
    18.  
    19. Inspect or adjust valve lash
    20.  
    21. A/C compressor and PS drive belts
    22.  
    23. Cylinder head valve covers
    24.  
    25. Ignition coil assembly
    26.  
    27. Intake air surge tank
    28.  
    29. Emission control valve set
    30.  
    31. Air cleaner assembly
    32.  
    33. Vacuum hoses
    34.  
    35. V-bank cover sub-assembly
    36.  
    37. Front suspension upper center brace
    38.  
    39. RF wheel
    40.  
    41. Engine coolant. Check for leaks
    42.  
    43. System initialization
    44.  

  4.  


    Click image to see an enlarged view

    Fig. Bolt torque procedure RH camshaft No. 2-3.3L (3MZ-FE) Engine



    Click image to see an enlarged view

    Fig. Bolt torque procedure RH camshaft No. 1-3.3L (3MZ-FE) Engine



    Click image to see an enlarged view

    Fig. Bolt torque procedure LH camshaft No. 3-3.3L (3MZ-FE) Engine



    Click image to see an enlarged view

    Fig. Bolt torque procedure LH camshaft No. 4-3.3L (3MZ-FE) Engine


4.0L (1UZ-FE) & 4.3L (3UZ-FE) Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel pressure from the fuel lines.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable. Wait at least 90 seconds before performing any other work
     
    Positive battery cable
     
    Battery
     
    Air cleaner inlet
     
    V bank cover by removing the bolt and 2 cap nuts
     
    Air cleaner and intake air connector assembly
     
    Drive belt
     
    Fluid coupling and the fan pulley. The drive belt tension may be slackened by turning the tensioner counterclockwise. The pulley bolt for the drive belt tensioner has a left-handed thread.
     
    Radiator
     
    The right-hand No. 3 timing belt cover
     
    Left-hand No. 3 timing belt cover
     
    Evaporative Emissions (EVAP) hose clamp from the timing belt cover. For all other vehicles, disconnect the EVAP hose from the hose clamp on the timing belt cover.
     
    4 bolts to the left-hand timing belt cover
     
    Cord grommet from the timing belt cover and remove the timing belt cover
     
    Drive belt idler pulley by removing the pulley bolt and cover plate
     
    Right-hand and left No. 2 timing belt covers
     
    No. 1 ignition coil
     
    Air conditioning compressor from the engine. Do NOT disconnect the air conditioning pressure lines.
     
    Fan bracket by removing the 2 bolts and 2 nuts
     
    Alternator from the engine
     
    Drive belt tensioner
     

  6.  
  7. Set the engine to Top Dead Center (TDC) on cylinder No. 1.
  8.  
  9. Turn the crankshaft pulley approximately 50°clockwise and put the timing mark of the crankshaft pulley in line with the centers of the crankshaft pulley bolt and the idler pulley bolt.
  10.  


WARNING
If the timing belt is disengaged, having the crankshaft pulley at the wrong angle can cause the piston head and valve head to come into contact with each other when you remove the camshaft timing pulley. Always set the crankshaft pulley at the correct angle before removing the timing belt.

  1. If the timing belt is to be reused, turn the crank pulley slowly; check that the 3 installation marks are present on the belt. If the marks are not present, make new installation marks before removing the belt. The marks should align with the timing marks on each camshaft pulley and the crank pulley.
  2.  
  3. Remove or disconnect the following:

    Timing belt tensioner
     
    Timing belt from the camshaft timing pulleys
     
    Camshaft timing pulleys
     
    No. 2 ignition coil
     
    Rear timing belt plates
     
    Throttle body
     
    Spark plug wires, wire clamps and the wire cover assembly from the right cylinder head
     
    Right cylinder head cover by removing the 8 bolts and 8 washers
     
    Transmission oil dipstick
     
    Evaporative Emission (EVAP) control hose from the Vacuum Switching Valve (VSV)
     
    Engine wire clamp from the wire bracket on the delivery pipe
     
    Spark plug wires and clamps from the left-hand cylinder head cover
     
    Left cylinder head cover by removing the 8 bolts and 8 seal washers
     
    Semi-circular plugs, if necessary
     

  4.  


WARNING
Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being removed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break.

  1. To remove the exhaust camshaft from the right side cylinder head:
    1. Position the service bolt hole of the drive subgear to the upright position. Secure the camshaft subgear to drive gear with a service bolt.
    2.  
    3. Set the timing mark (single dot) on the camshaft drive gear at approximately 10 degrees. Turn the camshaft with a wrench on the hexagonal flats.
    4.  
    5. Alternately loosen and remove the bearing cap bolts holding the intake camshaft side of the oil feed pipe to the cylinder head.
    6.  
    7. Uniformly loosen (in several passes) and remove the bearing cap bolts, in sequence.
    8.  
    9. Remove the oil feed pipe and the bearing caps. Remove the camshaft.
    10.  
    11. To remove the intake camshaft from the right side cylinder head:
    12.  
    13. Set the timing mark (single dot) on the camshaft drive gear at approximately 45 degrees. Turn the camshaft with a wrench on the hexagonal flats.
    14.  
    15. Uniformly loosen (in several passes) and remove the bearing cap bolts in the proper sequence.
    16.  
    17. Remove the bearing caps, oil seal and the intake camshaft.
    18.  

  2.  
  3. To remove the exhaust camshaft of the left side cylinder head:
    1. Position the service bolt hole of the drive subgear to the upright position. Secure the camshaft subgear to drive gear with a service bolt.
    2.  

  4.  


NOTE
When removing the camshaft, be sure the torsional spring force of the subgear has been eliminated.

  1. Set the timing mark (2 dots) on the camshaft drive gear at approximately 15 degrees, by turning the camshaft with the proper tool.
  2.  
  3. Alternately loosen and remove the bearing cap bolts holding the intake camshaft side of the oil feed pipe to the cylinder head.
  4.  
  5. Uniformly loosen (in several passes) and remove the bearing cap bolts in the proper sequence.
  6.  
  7. Remove the oil feed pipe and the bearing caps. Remove the camshaft.
  8.  

  1. To remove the intake camshaft from the left side cylinder head:
    1. Set the timing mark (single dot) of the camshaft drive gear at approximately 60 degrees, by turning the camshaft with the proper tool.
    2.  
    3. Uniformly loosen (in several passes) and remove the bearing cap bolts, in sequence.
    4.  
    5. Remove the bearing caps, oil seal and the intake camshaft.
    6.  
    7. Remove the valve lash adjuster shims and hydraulic lash adjusters. Identify each lash adjuster and shim as it is removed so it can be reinstalled in the same position. If the lash adjusters are to be reused, store them upside down in a sealed container.
    8.  

  2.  


    Click image to see an enlarged view

    Fig. Bolt loosening sequence for the exhaust camshaft on the right cylinder head-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Loosen the bearing cap bolts for the intake camshaft on the right cylinder head in the sequence shown-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Turning the exhaust camshaft on the left cylinder head 15 degrees-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Bolt removal sequence for the intake camshaft on the left cylinder head-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Bolt removal sequence for the exhaust camshaft on the left cylinder head-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)


To install:

  1. Install or connect the following:

    Valve lash adjusters and shims. Check the valve clearance and replace the shims as necessary.
     
    New seal packing to the bearing caps
     
    Bearing cap on the right side cylinder head, markedI1I6
     
    Oil on the threads of the cap bolts. Install the bearing cap bolts with new washers and tighten to 12 ft. lbs. (16 Nm).
     

  2.  
  3. To install the right side cylinder head intake camshaft:
    1. Apply grease to the thrust portion of the camshaft.
    2.  
    3. Place the intake camshaft at a 45 degree angle of the timing mark (single dot) on the cylinder head.
    4.  
    5. Remove any old packing and apply new seal packing to the bearing cap markedI6I6
    6.  
    7. Align the arrows at the front and rear of the cylinder head with the bearing cap.
    8.  
    9. Install the remaining bearing caps in the proper sequence with the arrow mark facing rearward. Install the oil feed pipe and the mounting bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  

  4.  
  5. To install the right side cylinder head exhaust camshaft:
    1. Set the timing mark (single dot) on the camshaft drive gear at a 10 degree angle by turning the intake camshaft with the proper tool.
    2.  
    3. Apply grease to the thrust portion of the camshaft.
    4.  
    5. Align the timing marks (single dots) on the camshaft drive and driven gears.
    6.  
    7. Place the exhaust camshaft in the cylinder head. Install the rear bearing cap with the arrow mark facing rearward.
    8.  
    9. Align the arrow marks at the front and rear of the cylinder head with the mark on the bearing cap. Apply a light coat of oil on the threads of the bearing cap bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  
    13. Bring the service bolt installed upward by turning the camshaft with the proper tool. Remove the service bolt.
    14.  

  6.  
  7. To install the left side cylinder head intake camshaft:
    1. Apply grease to the thrust portion of the camshaft.
    2.  
    3. Place the intake camshaft with the timing mark (single dot) at a 60 degree angle on the cylinder head.
    4.  
    5. Remove any old packing and apply new seal packing to the bearing cap markedI6I1
    6.  
    7. Align the arrows at the front and rear of the cylinder head with the bearing cap. Apply a light coat of oil on the threads of the bearing cap bolts.
    8.  
    9. Install the remaining bearing caps in the proper sequence with the arrow mark facing rearward. Install the oil feed pipe and the mounting bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  

  8.  
  9. Install the left side cylinder head exhaust camshaft by:
    1. Set the timing mark (2 dots) on the camshaft drive gear at a 15 degree angle by turning the intake camshaft with the proper tool.
    2.  
    3. Apply grease to the thrust portion of the camshaft.
    4.  
    5. Align the timing marks (2 dots each) on the camshaft drive and driven gears.
    6.  
    7. Place the exhaust camshaft on the cylinder head. Install the rear bearing cap with the arrow mark facing rearward.
    8.  
    9. Align the arrow marks at the front and rear of the cylinder head with the mark on the bearing cap. Apply a light coat of oil on the threads of the bearing cap bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  

  10.  
  11. Bring the service bolt installed upward by turning the camshaft with the proper tool. Remove the service bolt.
  12.  
  13. Install or connect the following:

    Camshaft oil seals. Be sure to apply Multi-Purpose (MP) grease to the new oil seal lip.
     
    Semi-circular plugs to the cylinder heads
     
    Left cylinder head cover and bolts. Tighten the bolts to 52 inch lbs. (6 Nm).
     
    Spark plug wires and clamps to the left cylinder head cover
     
    Engine wire clamp to the wire bracket on the delivery pipe
     
    EVAP hose to the VSV
     
    Transmission oil dipstick
     
    Right cylinder head cover and bolts. Tighten the bolts to 52 inch lbs. (6 Nm).
     
    Spark plug wires and clamps to the right cylinder head cover
     
    Throttle body to the air intake chamber. Install the 2 bolts and 2 nuts and tighten to 13 ft. lbs. (18 Nm).
     
    Timing belt rear plates by installing the bolts. Tighten the bolts to 66 inch lbs. (8 Nm).
     
    No. 2 ignition coil
     

  14.  
  15. Align the knock pin on the right side camshaft with the knock pin of the timing pulley. Slide on the timing pulley with the right side mark facing forward. Tighten the bolt to 80 ft. lbs. (108 Nm).
  16.  
  17. Align the knock pin on the left side camshaft with the knock pin of the timing pulley. Slide on the timing pulley with the left side mark facing forward. Tighten the bolt to 80 ft. lbs. (108 Nm).
  18.  
  19. Turn the crankshaft pulley and align its groove with the0
  20.  
  21. Turn each camshaft timing pulley and align the timing marks of the pulley with the timing belt rear plate.
  22.  
  23. Attach the timing belt to the left side camshaft timing pulley:
  24.  
  25. Using the proper tool, slightly turn the left side timing pulley clockwise. Align the installation mark of the timing belt with the timing mark of the camshaft timing pulley and hang the timing belt on the left side camshaft pulley.
  26.  
  27. Align the timing marks of the left side camshaft pulley and the timing belt rear plate.
  28.  
  29. Check that the timing belt has tension between crankshaft timing pulley and the left side camshaft pulley.
  30.  
  31. Install the timing belt to the right side camshaft timing pulley:
  32.  
  33. Using the proper tool, slightly turn the right side timing pulley clockwise. Align the installation mark of the timing belt with the timing mark of the camshaft timing pulley and hang the timing belt on the right side camshaft pulley.
  34.  
  35. Align the timing marks of the right side camshaft pulley and the timing belt rear plate.
  36.  
  37. Check that the timing belt has tension between crankshaft timing pulley and the right side camshaft pulley.
  38.  
  39. The timing belt tensioner must be set prior to installation. The tensioner can be set by:
    1. Place a plate washer between the tensioner and a block. Using a press, press in the pushrod using 220-225 lbs. (100-102 kg.) of pressure.
    2.  
    3. Align the holes of the pushrod and housing, pass a 0.05 in. (1.27mm) rod through the holes to keep the setting position of the pushrod.
    4.  
    5. Release the press and install the dust boot to the tensioner.
    6.  
    7. Loosely install the tensioner. Evenly and alternately tighten the bolts to 20 ft. lbs. (26 Nm). Remove the tool from the tensioner.
    8.  
    9. Turn the crankshaft pulley 2 complete revolutions from TDC to TDC. Always turn the crankshaft clockwise. Check that all belt and pulley marks align with their reference marks. If any mark is out of perfect alignment, the timing belt must be removed and reinstalled.
    10.  

  40.  
  41. Install or connect the following:

    Remaining components
     
    V bank cover
     
    Coolant
     
    Battery and battery tray
     
    Battery cables, positive cable first
     
    Air cleaner inlet
     
    Battery clamp cover
     
    Engine undercover
     
    Oil pan protector
     

  42.  


    Click image to see an enlarged view

    Fig. Right side intake camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Right side exhaust camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Left side intake camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)



    Click image to see an enlarged view

    Fig. Left side exhaust camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines (Except 2004)


  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Relieve the fuel pressure from the fuel lines.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable. Wait at least 90 seconds before performing any other work
     
    Positive battery cable
     
    Battery.
     
    Air cleaner inlet
     
    V bank cover by removing the bolt and 2 cap nuts.
     
    Air cleaner and intake air connector assembly.
     
    Drive belt
     
    Fluid coupling and the fan pulley. The drive belt tension may be slackened by turning the tensioner counterclockwise. The pulley bolt for the drive belt tensioner has a left-handed thread.
     
    Radiator.
     
    The right-hand No. 3 timing belt cover
     
    Left-hand No. 3 timing belt cover
     
    Evaporative Emissions (EVAP) hose clamp from the timing belt cover. For all other vehicles, disconnect the EVAP hose from the hose clamp on the timing belt cover.
     
    4 bolts to the left-hand timing belt cover.
     
    Cord grommet from the timing belt cover and remove the timing belt cover.
     
    Drive belt idler pulley by removing the pulley bolt and cover plate.
     
    Right-hand and left No. 2 timing belt covers.
     
    Distributor housings
     
    No. 1 ignition coil
     
    Air conditioning compressor from the engine. Do not disconnect the air conditioning pressure lines.
     
    Fan bracket by removing the 2 bolts and 2 nuts.
     
    Alternator from the engine
     
    Drive belt tensioner
     

  6.  
  7. Set the engine to Top Dead Center (TDC) on cylinder No. 1.
  8.  
  9. Turn the crankshaft pulley approximately 50° clockwise and put the timing mark of the crankshaft pulley in line with the centers of the crankshaft pulley bolt and the idler pulley bolt.
    WARNING
    If the timing belt is disengaged, having the crankshaft pulley at the wrong angle can cause the piston head and valve head to come into contact with each other when you remove the camshaft timing pulley. Always set the crankshaft pulley at the correct angle before removing the timing belt.

  10.  
  11. If the timing belt is to be reused, turn the crank pulley slowly; check that the 3 installation marks are present on the belt. If the marks are not present, make new installation marks before removing the belt. The marks should align with the timing marks on each camshaft pulley and the crank pulley.
  12.  
  13. Remove or disconnect the following:
    WARNING
    Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being removed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break.



    Timing belt tensioner
     
    Timing belt from the camshaft timing pulleys
     
    Camshaft timing pulleys
     
    No. 2 ignition coil
     
    Rear timing belt plates
     
    Throttle body
     
    Spark plug wires, wire clamps and the wire cover assembly from the right cylinder head.
     
    Right cylinder head cover by removing the 8 bolts and 8 washers.
     
    Transmission oil dipstick
     
    Evaporative Emission (EVAP) control hose from the Vacuum Switching Valve (VSV)
     
    Engine wire clamp from the wire bracket on the delivery pipe.
     
    Spark plug wires and clamps from the left-hand cylinder head cover.
     
    Left cylinder head cover by removing the 8 bolts and 8 seal washers.
     
    Semi-circular plugs, if necessary.
     

  14.  
  15. To remove the exhaust camshaft from the right side cylinder head:
    1. Position the service bolt hole of the drive subgear to the upright position. Secure the camshaft subgear to drive gear with a service bolt.
    2.  
    3. Set the timing mark (single dot) on the camshaft drive gear at approximately 10 degrees. Turn the camshaft with a wrench on the hexagonal flats.
    4.  
    5. Alternately loosen and remove the bearing cap bolts holding the intake camshaft side of the oil feed pipe to the cylinder head.
    6.  
    7. Uniformly loosen (in several passes) and remove the bearing cap bolts, in sequence.
    8.  
    9. Remove the oil feed pipe and the bearing caps. Remove the camshaft.
    10.  
    11. To remove the intake camshaft from the right side cylinder head:
    12.  
    13. Set the timing mark (single dot) on the camshaft drive gear at approximately 45 degrees. Turn the camshaft with a wrench on the hexagonal flats.
    14.  
    15. Uniformly loosen (in several passes) and remove the bearing cap bolts in the proper sequence.
    16.  
    17. Remove the bearing caps, oil seal and the intake camshaft.
    18.  

  16.  
  17. To remove the exhaust camshaft of the left side cylinder head:
    1. Position the service bolt hole of the drive subgear to the upright position. Secure the camshaft subgear to drive gear with a service bolt.
      NOTE
      When removing the camshaft, be sure the torsional spring force of the subgear has been eliminated.

    2.  
    3. Set the timing mark (2 dots) on the camshaft drive gear at approximately 15 degrees, by turning the camshaft with the proper tool.
    4.  
    5. Alternately loosen and remove the bearing cap bolts holding the intake camshaft side of the oil feed pipe to the cylinder head.
    6.  
    7. Uniformly loosen (in several passes) and remove the bearing cap bolts in the proper sequence.
    8.  
    9. Remove the oil feed pipe and the bearing caps. Remove the camshaft.
    10.  

  18.  
  19. To remove the intake camshaft from the left side cylinder head:
    1. Set the timing mark (single dot) of the camshaft drive gear at approximately 60 degrees, by turning the camshaft with the proper tool.
    2.  
    3. Uniformly loosen (in several passes) and remove the bearing cap bolts, in sequence.
    4.  
    5. Remove the bearing caps, oil seal and the intake camshaft.
    6.  
    7. Remove the valve lash adjuster shims and hydraulic lash adjusters. Identify each lash adjuster and shim as it is removed so it can be reinstalled in the same position. If the lash adjusters are to be reused, store them upside down in a sealed container.

      Click image to see an enlarged view

      Fig. Bolt loosening sequence for the exhaust camshaft on the right cylinder head-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



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      Fig. Loosen the bearing cap bolts for the intake camshaft on the right cylinder head in the sequence shown-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



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      Fig. Turning the exhaust camshaft on the left cylinder head 15 degrees-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



      Click image to see an enlarged view

      Fig. Bolt removal sequence for the intake camshaft on the left cylinder head-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



      Click image to see an enlarged view

      Fig. Bolt removal sequence for the exhaust camshaft on the left cylinder head-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines

    8.  

  20.  

To install:

  1. Install or connect the following:

    Valve lash adjusters and shims. Check the valve clearance and replace the shims as necessary.
     
    New seal packing to the bearing caps
     
    Bearing cap on the right side cylinder head, marked I1 , in position with the arrow mark facing the rear. Install the bearing cap on the left side cylinder head, marked I6 , in position with the arrow mark facing the front.
     
    Oil on the threads of the cap bolts. Install the bearing cap bolts with new washers and tighten to 12 ft. lbs. (16 Nm).
     

  2.  
  3. To install the right side cylinder head intake camshaft:
    1. Apply grease to the thrust portion of the camshaft.
    2.  
    3. Place the intake camshaft at a 45 degree angle of the timing mark (single dot) on the cylinder head.
    4.  
    5. Remove any old packing and apply new seal packing to the bearing cap marked I6 and install the front bearing cap, marked I6 with the arrow facing rearward.
    6.  
    7. Align the arrows at the front and rear of the cylinder head with the bearing cap.
    8.  
    9. Install the remaining bearing caps in the proper sequence with the arrow mark facing rearward. Install the oil feed pipe and the mounting bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).

      Click image to see an enlarged view

      Fig. Right side intake camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



      Click image to see an enlarged view

      Fig. Right side exhaust camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



      Click image to see an enlarged view

      Fig. Left side intake camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines



      Click image to see an enlarged view

      Fig. Left side exhaust camshaft bracket bolt tightening sequence-4.0L (1UZ-FE) and 4.3L (3UZ-FE) Engines

    12.  

  4.  
  5. To install the right side cylinder head exhaust camshaft:
    1. Set the timing mark (single dot) on the camshaft drive gear at a 10 degree angle by turning the intake camshaft with the proper tool.
    2.  
    3. Apply grease to the thrust portion of the camshaft.
    4.  
    5. Align the timing marks (single dots) on the camshaft drive and driven gears.
    6.  
    7. Place the exhaust camshaft in the cylinder head. Install the rear bearing cap with the arrow mark facing rearward.
    8.  
    9. Align the arrow marks at the front and rear of the cylinder head with the mark on the bearing cap. Apply a light coat of oil on the threads of the bearing cap bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  
    13. Bring the service bolt installed upward by turning the camshaft with the proper tool. Remove the service bolt.
    14.  

  6.  
  7. To install the left side cylinder head intake camshaft:
    1. Apply grease to the thrust portion of the camshaft.
    2.  
    3. Place the intake camshaft with the timing mark (single dot) at a 60 degree angle on the cylinder head.
    4.  
    5. Remove any old packing and apply new seal packing to the bearing cap marked I6 and install the front bearing cap, marked I1 with the arrow facing rearward.
    6.  
    7. Align the arrows at the front and rear of the cylinder head with the bearing cap. Apply a light coat of oil on the threads of the bearing cap bolts.
    8.  
    9. Install the remaining bearing caps in the proper sequence with the arrow mark facing rearward. Install the oil feed pipe and the mounting bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  

  8.  
  9. Install the left side cylinder head exhaust camshaft by:
    1. Set the timing mark (2 dots) on the camshaft drive gear at a 15 degree angle by turning the intake camshaft with the proper tool.
    2.  
    3. Apply grease to the thrust portion of the camshaft.
    4.  
    5. Align the timing marks (2 dots each) on the camshaft drive and driven gears.
    6.  
    7. Place the exhaust camshaft on the cylinder head. Install the rear bearing cap with the arrow mark facing rearward.
    8.  
    9. Align the arrow marks at the front and rear of the cylinder head with the mark on the bearing cap. Apply a light coat of oil on the threads of the bearing cap bolts.
    10.  
    11. Uniformly tighten the bearing cap bolts in the proper sequence to 12 ft. lbs. (16 Nm).
    12.  

  10.  
  11. Bring the service bolt installed upward by turning the camshaft with the proper tool. Remove the service bolt.
  12.  
  13. Install or connect the following:

    Camshaft oil seals. Be sure to apply Multi-Purpose (MP) grease to the new oil seal lip.
     
    Semi-circular plugs to the cylinder heads.
     
    Left cylinder head cover and bolts. Tighten the bolts to 52 inch lbs. (6 Nm).
     
    Spark plug wires and clamps to the left cylinder head cover
     
    Engine wire clamp to the wire bracket on the delivery pipe
     
    EVAP hose to the VSV
     
    Transmission oil dipstick
     
    Right cylinder head cover and bolts. Tighten the bolts to 52 inch lbs. (6 Nm).
     
    Spark plug wires and clamps to the right cylinder head cover
     
    Throttle body to the air intake chamber. Install the 2 bolts and 2 nuts and tighten to 13 ft. lbs. (18 Nm).
     
    Timing belt rear plates by installing the bolts. Tighten the bolts to 66 inch lbs. (8 Nm).
     
    No. 2 ignition coil
     

  14.  
  15. Align the knock pin on the right side camshaft with the knock pin of the timing pulley. Slide on the timing pulley with the right side mark facing forward. Tighten the bolt to 80 ft. lbs. (108 Nm).
  16.  
  17. Align the knock pin on the left side camshaft with the knock pin of the timing pulley. Slide on the timing pulley with the left side mark facing forward. Tighten the bolt to 80 ft. lbs. (108 Nm).
  18.  
  19. Turn the crankshaft pulley and align its groove with the 0 timing mark on the timing belt cover.
  20.  
  21. Turn each camshaft timing pulley and align the timing marks of the pulley with the timing belt rear plate.
  22.  
  23. Attach the timing belt to the left side camshaft timing pulley:
  24.  
  25. Using the proper tool, slightly turn the left side timing pulley clockwise. Align the installation mark of the timing belt with the timing mark of the camshaft timing pulley and hang the timing belt on the left side camshaft pulley.
  26.  
  27. Align the timing marks of the left side camshaft pulley and the timing belt rear plate.
  28.  
  29. Check that the timing belt has tension between crankshaft timing pulley and the left side camshaft pulley.
  30.  
  31. Install the timing belt to the right side camshaft timing pulley:
  32.  
  33. Using the proper tool, slightly turn the right side timing pulley clockwise. Align the installation mark of the timing belt with the timing mark of the camshaft timing pulley and hang the timing belt on the right side camshaft pulley.
  34.  
  35. Align the timing marks of the right side camshaft pulley and the timing belt rear plate.
  36.  
  37. Check that the timing belt has tension between crankshaft timing pulley and the right side camshaft pulley.
  38.  
  39. The timing belt tensioner must be set prior to installation. The tensioner can be set by:
    1. Place a plate washer between the tensioner and a block. Using a press, press in the pushrod using 220-225 lbs. (100-102 kg.) of pressure.
    2.  
    3. Align the holes of the pushrod and housing, pass a 0.05 in. (1.27mm) rod through the holes to keep the setting position of the pushrod.
    4.  
    5. Release the press and install the dust boot to the tensioner.
    6.  
    7. Loosely install the tensioner. Evenly and alternately tighten the bolts to 20 ft. lbs. (26 Nm). Remove the tool from the tensioner.
    8.  
    9. Turn the crankshaft pulley 2 complete revolutions from TDC to TDC. Always turn the crankshaft clockwise. Check that all belt and pulley marks align with their reference marks. If any mark is out of perfect alignment, the timing belt must be removed and reinstalled.
    10.  

  40.  
  41. Install or connect the following:

    Remaining components
     
    V bank cover.
     
    Coolant
     
    Battery and battery tray
     
    Battery cables, positive cable first
     
    Air cleaner inlet
     
    Battery clamp cover
     
    Engine undercover
     
    Oil pan protector
     

  42.  

 
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