Bonneville, LeSabre, Park Avenue 2000-2005

Camshaft, Bearings & Lifters

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Bearing Replacement



3.8L Engine
  1. Assemble Camshaft Bearing Remover Tool J-33049.
  2.  
  3. Drive out the camshaft bearings.
  4.  

To install:

  1. Using the remover tool J-33049, Place the bearing on the tool.
    CAUTION
    Severe engine damage may result if the oil holes are not correctly aligned.

  2.  
  3. Index the bearing oil holes with the engine block oil passages.
  4.  
  5. Install the bearings.
  6.  

Inspection



3.8L Engine
  1. Clean the camshaft in solvent.
  2.  
  3. Measure the camshaft journals with a micrometer. If the camshaft journals are not within specifications, replace the camshaft. The measurement should be 1.8462-1.8448 inch (47.655-46.858 mm). If the measurement is not within specifications the engine camshaft must be replaced.
  4.  
  5. Measure the camshaft runout using a Magnetic Base Indicator Set J-7872.
  6.  
  7. Mount the camshaft in V-blocks between centers.
  8.  
  9. Check the intermediate camshaft journal.
  10.  
  11. If the camshaft journals are more than 0.0010 (0.025 mm) out-of-round, then replace the engine camshaft.
  12.  

4.6L Engine
  1. Clean the camshaft in solvent.
  2.  
  3. Dry the camshaft with compressed air.
  4.  
  5. Cover the camshafts with a clean oil soaked towel in order to prevent corrosion.
  6.  
  7. Inspect the camshaft sprocket locating pin for damage or wear.
  8.  
  9. Inspect the threads for the camshaft sprocket bolt.
  10.  
  11. Inspect the camshaft lobes and journals (4) for excessive scoring or pitting, discoloration from heat or deformation from excessive wear.
  12.  
  13. Inspect the left intake camshaft for the following additional conditions excessive wear on the camshaft seal surface or damage to the threads for the water pump pulley bolt.
  14.  
  15. If any of the above conditions exist on the camshaft, replace the camshaft.
  16.  
  17. Measure the camshaft journals for diameter and out-of-round using an outside micrometer.
  18.  
  19. If the diameter is smaller than 1.061 inch (26.948mm), replace the camshaft. If out-of-round exceeds 0.022 inch (0.0009mm), replace the camshaft.
  20.  
  21. Measure the camshaft runout. If runout exceeds 0.0020 inch, (0.050mm), replace the camshaft.
  22.  
  23. Measure the camshaft lobe wear using a dial indicator.
  24.  
  25. Place the indicator tip on the base circle of the camshaft lobe.
  26.  
  27. Place the dial at zero.
  28.  
  29. Rotate the camshaft until the indicator tip is at the highest point on the lobe. This reading is the lift of the camshaft lobe. If the lift exceeds 0.2423 inch (6.154mm) for the intake lobe, or 0.2336 inch (5.944mm) for the exhaust lobe, replace the camshaft.
  30.  

Removal & Installation



3.8L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove the engine and mount it on an engine stand.
  6.  
  7. Remove or disconnect the following:
    NOTE
    A magnet may be helpful when pulling the lifters out of their bores. Identify all parts as they are removed, so they can be reinstalled in their original locations.



    Negative battery cable
     
    Supercharger, if equipped
     
    Intake manifold
     
    Rocker arm covers
     
    Rocker arm assemblies
     
    Pushrods
     
    Lifters and guides
     



    Crankshaft balancer
     
    Timing chain front cover
     

  8.  
  9. Set the engine to Top Dead Center (TDC) No. 1 cylinder (firing position) to align the timing marks, before disassembling the timing chain and sprockets.
    WARNING
    Align the timing marks of the camshaft and crankshaft sprockets to avoid burring the camshaft journals by the crankshaft.

  10.  
  11. Remove or disconnect the following:
    WARNING
    If the camshaft was replaced the lifters must also be replaced. The old lifters have developed a wear pattern and will cause the new camshaft to wear prematurely.



    Camshaft sprocket and timing chain
     
    Camshaft thrust plate
     
    Camshaft
     

  12.  

To install:

  1. Coat the camshaft lobes and bearings with camshaft break-in prelube prior to installation.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Camshaft thrust plate. Torque the bolts to 10 ft. lbs. (14 Nm).
     
    Camshaft sprocket and timing chain with timing marks aligned. Torque the camshaft sprocket bolt to 74 ft. lbs. (100 Nm) plus an additional 90 degree ( 1 / 4 ) turn.

    Click image to see an enlarged view

    Fig. The timing marks should face each other when the chain and gears are installed properly

     
    Timing chain front cover
     
    Crankshaft balancer. Torque the mounting bolt to 111 ft. lbs. (150 Nm). plus an additional 76 degree turn.
     

  4.  
  5. Coat the valve lifters with camshaft break-in prelube.
  6.  
  7. Install or connect the following:

    Valve lifters
     
    Lifter guides and lifter guide retainer. Torque the retainer mounting bolts to 22 ft. lbs. (30 Nm).
     
    Pushrods and rocker arms. Torque the rocker arm bolts to 11 ft. lbs. (15 Nm) plus an additional 90 degree turn.
     
    Rocker arm covers
     
    Intake manifold
     
    Supercharger, if equipped
     
    Engine
     
    Negative battery cable
     

  8.  
  9. Verify that all fluid levels are full and correct.
  10.  
  11. Start the engine and check for leaks. Check engine operation.
  12.  

4.6L Engine
Left Side

Tools Required



J 45059 Torque Angle/Meter
 
J 44212 Camshaft Holding Tool
 
EN 46327 Timing Chain Retention Tool
 
J 38185 Hose Clamp Pliers
 
J 38823 Water Pump Drive Pulley Installer
 
J 38825 Water Pump Drive Pulley Remover
 

  1. Remove the fuel injector sight shield.
  2.  
  3. Partially drain the cooling system.
  4.  
  5. Position tool J 38185 to the clamp in order to remove the radiator inlet hose from the water housing crossover.
  6.  
  7. Disconnect the PCV fresh air tube from the camshaft cover.
  8.  
  9. Remove the ignition coil cassette.
  10.  
  11. Remove the 4 spark plug boots.
  12.  
  13. Disconnect the cable harness clips at the front of the camshaft cover and position the cable harness aside.
  14.  
  15. Remove the secondary AIR valve bracket nut closest to the center of the engine.
  16.  
  17. Pry outward slightly on the secondary AIR valve bracket in order to gain clearance to remove the water pump drive belt shield nut.
  18.  
  19. Remove the water pump drive belt shield fasteners.
  20.  
  21. Remove the water pump drive belt shield.
  22.  
  23. Disconnect the water pump drive belt.
  24.  
  25. Loosen the 2 bolts attaching the water pump belt tensioner to the water crossover.
  26.  
  27. Remove the water pump belt tensioner .
  28.  
  29. Remove the plastic dust cap from the end of the intake camshaft.
  30.  
  31. Remove the water pump drive pulley from the intake camshaft using tool J 38825.

    Click image to see an enlarged view

    Fig. Remove the water pump drive pulley from the intake camshaft using tool J 38825-4.6L engine



    Click image to see an enlarged view

    Fig. Remove the camshaft seal-4.6L engine

  32.  
  33. Remove the 3 camshaft seal retainer bolts.
    NOTE
    DO NOT reuse the camshaft seal.

  34.  
  35. Remove the camshaft seal.
  36.  
  37. Remove the camshaft cover bolts.
  38.  
  39. Lift the camshaft drive end of the camshaft cover up.
  40.  
  41. Remove the camshaft cover reward to clear the water pump drive shaft.
  42.  
  43. Discard the camshaft cover perimeter seals and spark plug seals if there is any evidence of damage or if the seal comes out of the groove in the cover during removal.
  44.  
  45. Clean and inspect the camshaft cover.
  46.  
  47. Rotate the crankshaft to TDC of the # 1 cylinders compression stroke, both camshaft sprocket drive pins should be at the top of their rotation.
    CAUTION
    The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury.



    Click image to see an enlarged view

    Fig. Rotate the crankshaft to TDC of the # 1 cylinders compression stroke, both camshaft sprocket drive pins should be at the top of their rotation-4.6L engine

  48.  
  49. Install tool J 44212 over the camshafts.

    Click image to see an enlarged view

    Fig. Install tool J 44212 over the camshafts-4.6L engine

  50.  
  51. Use a paint stick to create a mark on the timing chain link adjacent to each camshaft sprocket timing mark.

    Click image to see an enlarged view

    Fig. Use a paint stick to create a mark on the timing chain link adjacent to each camshaft sprocket timing mark-4.6L engine



    Click image to see an enlarged view

    Fig. Timing chain retention tools-4.6L engine

  52.  
  53. Install the timing chain retention tools using the procedure below:
    1. Rotate the wing nut of the to the top of its travel.
    2.  
    3. Position the bottom retention tool on the cylinder head with the V-notch of the block adjacent to the left exhaust camshaft sprocket and chain.

      Click image to see an enlarged view

      Fig. Position the bottom retention tool on the cylinder head with the V-notch of the block adjacent to the left exhaust camshaft sprocket and chain-4.6L engine

    4.  
    5. Insert the hook end into a secondary timing chain link as shown.

      Click image to see an enlarged view

      Fig. Insert the hook end into a secondary timing chain link as shown-4.6L engine

    6.  
    7. Rotate the wing nut until it contacts the retention tool block. DO NOT tighten the wing nut at this time.
    8.  
    9. Rotate the wing nut to the top of its travel.
    10.  
    11. Position the top retention tool on the cylinder head with the V-notch of the block adjacent to the left intake camshaft sprocket and chain.

      Click image to see an enlarged view

      Fig. Position the top retention tool on the cylinder head with the V-notch of the block adjacent to the left intake camshaft sprocket and chain-4.6L engine

    12.  
    13. Insert the hook end into a secondary timing chain link as shown.

      Click image to see an enlarged view

      Fig. Insert the hook end into a secondary timing chain link as shown-4.6L engine

    14.  
    15. Rotate the wing nut until it contacts the retention tool block. Alternately tighten both wing nuts to retain the chain.
    16.  

  54.  
  55. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when removing the camshaft sprocket bolts.
  56.  
  57. Remove the camshaft sprocket bolts.
  58.  
  59. Remove the camshaft sprockets.
  60.  
  61. Alternately loosen the camshaft bearing cap bolts a few turns at a time until all valve spring pressure has been released.
  62.  
  63. Remove the camshaft bearing caps.
  64.  
  65. Remove tool J 44212 from the camshafts.
  66.  
  67. Remove the camshafts.
  68.  
  69. Remove the camshaft followers.
  70.  
  71. Clean and inspect the camshafts.
  72.  

To install:

  1. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the roller pivot pocket and valve slot areas of the camshaft followers.
    NOTE
    The follower must be positioned squarely on the valve tip so that the full width of the roller will completely contact the camshaft lobe. If the followers are being reused you must put them back in their original location.

  2.  
  3. Place the camshaft followers in position on the valve tip and the stationary hydraulic lash adjusters (SHLA). The rounded head of the follower goes on the SHLA, while the flat end goes on the valve tip.
  4.  
  5. Clean the camshaft carriers with a clean, lint-free cloth.
  6.  
  7. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the camshaft carriers, camshaft lobes and the camshaft journals.
  8.  
  9. Place the camshaft in the camshaft carriers with the camshaft sprocket drive pins near the top of their rotation and the camshaft lobes in a neutral position. The camshafts can be identified by a stamping near the rear journal. For example: L-EXH is defined as Left bank Exhaust.
  10.  
  11. Observe the markings on the camshaft bearing caps. Each camshaft bearing cap is marked in order to identify its location. The markings have the following meanings:

    The arrow should point to the front of the engine.
     
    The number indicates the position from the front of the engine.
     
    The "E" indicates the exhaust camshaft.
     
    The "I" indicates the Intake camshaft.
     

  12.  
  13. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the camshaft bearing caps.
  14.  
  15. Install the camshaft bearing caps according to the identification marks.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  16.  
  17. Install the camshaft bearing cap bolts in sequence.
    1. Alternately hand tighten the camshaft bearing cap bolts a few turns at a time until all caps are fully seated.
    2.  
    3. Tighten the camshaft bearing cap bolts to 44 inch lbs. (5 Nm).
    4.  
    5. Tighten the camshaft bearing cap bolts an additional 30 degrees using tool J 36660-A.
    6.  

  18.  
  19. Align the camshafts.
    CAUTION
    The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury.

  20.  
  21. Install tool J 44212 over the camshafts.
    NOTE
    Ensure the camshaft sprockets properly engage the camshaft sprocket drive pins and camshafts.

  22.  
  23. Slide the intake and exhaust camshaft sprockets off the pins of tool J 44213 and onto the pins of the camshafts.
  24.  
  25. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when tightening the camshaft sprocket bolts.
  26.  
  27. Install the camshaft sprocket bolts. Tighten the camshaft sprocket bolts to 89 ft. lbs. (120 Nm).
  28.  
  29. Verify the camshaft sprocket alignment.
  30.  
  31. Remove tool J 44212 from the camshafts.
  32.  
  33. Install the camshaft cover seal as required.
    NOTE
    Be careful to prevent the exposed section of the camshaft cover seal from being damaged by the edge of the cylinder head casting.

  34.  
  35. Insert the intake camshaft end through the hole in the camshaft cover.
  36.  
  37. Work the camshaft cover into position by pivoting the cover down and to the left allowing the cover to clear the camshaft drive chain and then aligning the bolt holes.
  38.  
  39. Install the 9 camshaft cover bolts. Tighten the camshaft cover bolts to 89 inch lbs. (10 Nm).

    Click image to see an enlarged view

    Fig. Left side camshaft bearing cap torque sequence-4.6L engine

  40.  
  41. Install the NEW seal as follows:
  42.  
  43. Lubricate the camshaft seal lips with engine oil.
  44.  
  45. Push the camshaft seal into position around the intake camshaft using the protective sleeve supplied with the seal.
  46.  
  47. Coat the bolt threads with sealant GM P/N 1052080 (Canadian P/N 10953480) or equivalent.
  48.  
  49. Install the camshaft seal bolts. Tighten the camshaft seal bolts to 27 inch lbs. (3 Nm).
  50.  
  51. Place the water pump drive pulley in position on the intake camshaft.
  52.  
  53. Install the water pump pulley using tool J 38823. During installation, the tool will bottom out on the camshaft at the proper depth.
  54.  
  55. Install the plastic dust cap into the end of the camshaft.
  56.  
  57. Position the water pump belt tensioner to the water crossover. Tighten the water pump belt tensioner bolts to 89 inch lbs. (10 Nm).
  58.  
  59. Connect the water pump drive belt.
  60.  
  61. Install the water pump drive belt shield.
  62.  
  63. Install the water pump drive belt shield fasteners. Tighten the water pump drive belt shield fasteners to 89 inch lbs. (10 Nm). Tighten the secondary AIR valve bracket nut to 80 inch lbs. (9 Nm).
  64.  
  65. Connect the cable harness clips to the cable harness at the front of the camshaft cover.
  66.  
  67. Install the spark plug boots onto the coil cassette. Ensure that the boots are fully seated against the cassette.
  68.  
  69. Install the ignition coil cassette.
  70.  
  71. Connect the PCV fresh air tube to the left camshaft cover.
  72.  
  73. Position tool J 38185 to the clamp in order to connect the radiator inlet hose to the water housing crossover.
  74.  
  75. Install the fuel injector sight shield.
  76.  
  77. Fill the cooling system.
  78.  

Right Side
  1. Remove the 2 nuts from the intake manifold sight shield.
  2.  
  3. Remove the sight shield from the engine.
  4.  
  5. Disconnect the PCV dirty air tube from the camshaft cover.
  6.  
  7. Disconnect the oxygen sensor wire.
  8.  
  9. Disconnect the vacuum tubes from the secondary AIR vent solenoid.
  10.  
  11. Disconnect the secondary AIR vent solenoid electrical connector.
  12.  
  13. Remove the secondary AIR control valve bracket.
  14.  
  15. Remove the nut securing the secondary AIR tube.
  16.  
  17. Remove the ignition coil cassette.
  18.  
  19. Remove the 4 spark plug boots.
  20.  
  21. Disconnect the cable harness clips at the front of the camshaft cover and position the cable harness aside.
  22.  
  23. Remove the 9 camshaft cover bolts.
  24.  
  25. Remove the camshaft cover.
  26.  
  27. Discard the camshaft cover perimeter seals and spark plug seals if there is any evidence of damage or if the seal comes out of the groove in the cover during removal.
  28.  
  29. Clean and inspect the camshaft cover.
  30.  
  31. Remove the camshaft position sensor.
  32.  
  33. Rotate the crankshaft to TDC of the # 1 cylinders compression stroke, both camshaft sprocket drive pins should be at the top of their rotation.
    WARNING
    The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury.



    Click image to see an enlarged view

    Fig. Rotate the crankshaft to TDC of the # 1 cylinders compression stroke, both right side camshaft sprocket drive pins should be at the top of their rotation-4.6L engine

  34.  
  35. Install tool J 44212 over the camshafts.

    Click image to see an enlarged view

    Fig. Install tool J 44212 over the camshafts

  36.  
  37. Use a paint stick to create a mark on the timing chain link adjacent to each camshaft sprocket timing mark.

    Click image to see an enlarged view

    Fig. Use a paint stick to create a mark on the timing chain link adjacent to each camshaft sprocket timing mark

  38.  
  39. Install the using the procedure below:
    1. Rotate the wing nut to the top of its travel.
    2.  
    3. Position the bottom retention tool on the cylinder head with the V-notch of the block adjacent to the right exhaust camshaft sprocket and chain.
    4.  
    5. Insert the hook end into a secondary timing chain link as shown.
    6.  
    7. Rotate the wing nut until it contacts the retention tool block. DO NOT tighten the wing nut at this time.
    8.  
    9. Rotate the wing nut to the top of its travel.
    10.  
    11. Position the top retention tool on the cylinder head with the V-notch of the block adjacent to the right intake camshaft sprocket and chain.
    12.  
    13. Insert the hook end into a secondary timing chain link as shown.
    14.  
    15. Rotate the wing nut until it contacts the retention tool block. Alternately tighten both wing nuts to retain the chain.
    16.  

  40.  
  41. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when removing the camshaft sprocket bolts.
  42.  
  43. Remove the camshaft sprocket bolts.
  44.  
  45. Alternately loosen the camshaft bearing cap bolts a few turns at a time until all valve spring pressure has been released.
  46.  
  47. Remove the camshaft bearing caps.
  48.  
  49. Remove tool J 44212 from the camshafts.
  50.  
  51. Remove the camshafts.
  52.  
  53. Remove the camshaft followers.
  54.  
  55. Clean and inspect the camshafts.
  56.  

To install:

  1. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the roller pivot pocket and valve slot areas of the camshaft followers.
    NOTE
    The follower must be positioned squarely on the valve tip so that the full width of the roller will completely contact the camshaft lobe. If the followers are being reused you must put them back in their original location.

  2.  
  3. Place the camshaft followers in position on the valve tip and the stationary hydraulic lash adjusters (SHLA). The rounded head of the follower goes on the SHLA, while the flat end goes on the valve tip.
  4.  
  5. Clean the camshaft carriers with a clean, lint-free cloth.
  6.  
  7. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the camshaft carriers, camshaft lobes and the camshaft journals.
  8.  
  9. Place the camshaft in the camshaft carriers with the camshaft sprocket drive pins near the top of their rotation and the camshaft lobes in a neutral position. The camshafts can be identified by a stamping near the rear journal. For example: R-EXH is defined as Right bank Exhaust.
  10.  
  11. Observe the markings on the camshaft bearing caps. Each camshaft bearing cap is marked in order to identify its location. The markings have the following meanings:

    The arrow should point to the front of the engine.
     
    The number indicates the position from the front of the engine.
     
    The "E" indicates the exhaust camshaft.
     
    The "I" indicates the Intake camshaft.

    Click image to see an enlarged view

    Fig. Right side camshaft bearing cap torque sequence-4.6L engine

     

  12.  
  13. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the camshaft bearing caps.
  14.  
  15. Install the camshaft bearing caps according to the identification marks.
  16.  
  17. Install the camshaft bearing cap bolts in sequence. Alternately hand tighten the camshaft bearing cap bolts a few turns at a time until all caps are fully seated.
    1. Tighten the camshaft bearing cap bolts to 44 inch lbs. (5 Nm).
    2.  
    3. Tighten the camshaft bearing cap bolts an additional 30 degrees using tool J 36660-A.
    4.  

  18.  
  19. Align the camshafts.
    CAUTION
    The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury.

  20.  
  21. Install tool J 44212 over the camshafts.
    NOTE
    Ensure the camshaft sprockets properly engage the camshaft sprocket drive pins and camshafts.

  22.  
  23. Slide the intake and exhaust camshaft sprockets off the pins of tool J 44213 and onto the pins of the camshafts.
  24.  
  25. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when tightening the camshaft sprocket bolts.
  26.  
  27. Install the camshaft sprocket bolts. Tighten the camshaft sprocket bolts to 89 ft. lbs. (120 Nm).
  28.  
  29. Verify the camshaft sprocket alignment.
  30.  
  31. Remove tool J 44212 from the camshafts.
  32.  
  33. Install the camshaft position sensor.
  34.  
  35. Install the camshaft cover seal as required.
    NOTE
    Be careful to prevent the exposed section of the camshaft cover seal from being damaged by the edge of the cylinder head casting.

  36.  
  37. Install the camshaft cover.
  38.  
  39. Install the 9 camshaft cover bolts. Tighten the camshaft cover bolts to 89 inch lbs. (10 Nm).
  40.  
  41. Install the spark plug boots onto the coil cassette. Ensure that the boots are fully seated against the cassette.
  42.  
  43. Install the ignition coil cassette.
  44.  
  45. Install the secondary AIR control valve bracket.
  46.  
  47. Connect the cable harness clips to the cable harness at the front of the camshaft cover.
  48.  
  49. Connect the secondary AIR vent solenoid electrical connector.
  50.  
  51. Connect the vacuum tubes to the secondary AIR vent solenoid.
  52.  
  53. Connect the oxygen sensor wire.
  54.  
  55. Connect the PCV dirty air tube to the camshaft cover.
  56.  
  57. Position the intake manifold sight shield to the engine.
  58.  
  59. Install the 2 intake manifold sight shield nuts. Tighten the nuts to 27 inch lbs. (3 Nm).
  60.  

 
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