Corvette 2005-2008

Camshaft, Bearings & Lifters

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Bearing Replacement



  1. Select the expanding driver and washer from the Camshaft Bearing Service Set J-33049.
  2.  
  3. Assemble the tool.
  4.  
  5. Insert the tool through the front of the engine block and into the bearing.
  6.  
  7. Tighten the expander assembly nut until snug.
  8.  
  9. Push the guide cone into the front camshaft bearing in order to align the tool.
  10.  
  11. Drive the bearing from the block bore.
    NOTE
    In order to remove the front camshaft bearing, operate the tool from the rear of the block, using the guide cone in the rear camshaft bearing bore.

  12.  
  13. Repeat the above procedures in order to remove the remaining bearings.
  14.  
  15. Measure the engine block camshaft bearing bores (1-5) in order to identify the correct OD size bearing for each position.
  16.  
  17. Select the expanding driver and washer (2 or 3) from the bearing service set.
  18.  
  19. Insert the tool through the front of the engine block and into the bearing.
  20.  
  21. Tighten the expander assembly nut until snug.
  22.  
  23. Push the guide cone into the front camshaft bearing in order to align the tool.
  24.  
  25. Drive the bearing into the block bore.
  26.  
  27. Install the front and rear bearings to the block.
  28.  

Inspection



  1. Inspect the camshaft bearing journals for scoring or excessive wear.
  2.  
  3. Inspect the camshaft valve lifter lobes for scoring or excessive wear.
  4.  
  5. Inspect the threaded bolt holes in the front of the camshaft for damaged threads or debris.
  6.  
  7. Inspect the camshaft sprocket pin for damage.
  8.  
  9. Inspect the camshaft retainer plate for wear or a damaged sealing gasket. If the camshaft retainer plate sealing gasket is not cut or damaged, it may be used again.
  10.  
  11. Inspect the camshaft bearings for proper fit in the engine block. Camshaft bearings have an interference fit to the engine block and should not be loose in their engine block bearing bores.
  12.  
  13. Inspect the camshaft bearings for excessive wear or scoring. Bearings with excessive scoring or wear must be replaced.
  14.  
  15. Measure the camshaft journals for wear and out-of-round with a micrometer.
  16.  
  17. If bearings journals are more than 0.001 inch (0.025 mm) out of round, replace the camshaft.
  18.  
  19. If the camshaft journals are more than 2.164 inch (54.99 mm), replace the camshaft.
  20.  
  21. Mount the camshaft in wooden V blocks or between centers on a fixture.
  22.  
  23. Using a dial indicator, measure the runout of the intermediate camshaft bearing journals.
  24.  
  25. If camshaft runout exceeds 0.002 inch (0.05 mm), the camshaft is bent and should be replaced.
  26.  
  27. Measure camshaft lobe lift using a dial indicator.
  28.  
  29. Remove the valve rocker arms and bolts.
  30.  
  31. Install the dial indicator mounting stud into the valve rocker arm bolt hole and position onto the stud.
  32.  
  33. Position the shaft of the dial indicator onto the end of the pushrod.
  34.  
  35. Rotate the face of the dial indicator to zero.
  36.  
  37. Slowly rotate the crankshaft clockwise until the dial indicator obtains its highest and lowest readings.
  38.  
  39. Compare cam lobe lifts to specifications in chart.
  40.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Engine
     
    Crankshaft balancer
     
    Oil level indicator tube
     
    Left and right exhaust manifolds
     
    Water pump
     
    Intake manifold
     
    Coolant air bleed pipe
     
    Left and right valve rocker arm covers
     
    Valve rocker arms and push rods
     
    Left and right cylinder heads
     
    Guides with lifters. Note the installed position of the guides.
     
    Oil pan-to-front cover bolts
     
    Front cover and gasket. Discard the old gasket.
     

  8.  
  9. Rotate the engine to Top Dead Center (TDC) and remove:
    WARNING
    All camshaft bearings are the same diameter, extreme care must be taken during camshaft removal or installation to avoid damaging them.



    Camshaft sprocket bolts
     
    Timing chain from the camshaft sprocket, and allow the timing chain to rest on the crankshaft sprocket
     
    Camshaft Position (CMP) sensor bolt and sensor
     
    Camshaft retainer plate
     

  10.  
  11. Install 3 M8 x 100mm long bolts in the front of the camshaft to use as a handle.
  12.  
  13. Carefully remove the camshaft from the engine, be sure not to damage the camshaft bearings.
  14.  
  15. Clean and inspect the camshaft and bearings.
  16.  

To install:

  1. Lubricate the camshaft with clean engine oil.
  2.  
  3. Three M8-1.25 x 100mm long bolts in the front of the camshaft to use as a handle.
  4.  
  5. Camshaft into the engine and remove the 3 bolts.
  6.  
  7. Camshaft retainer using a new gasket and torque the bolts to 18 ft. lbs. (25 Nm).
  8.  
  9. CMP sensor with a new O-ring and torque the bolt to 18 ft. lbs. (25 Nm).
  10.  
  11. Align the camshaft sprocket alignment mark in the 6 O-clock position.
  12.  
  13. Install the camshaft sprocket and timing chain
  14.  
  15. Tighten the camshaft bolts as follows:

    All except 2007 6.0L engine and 2008 6.2L engine, tighten the camshaft sprocket bolts to 26 ft. lbs. (35 Nm)
     
    2007 6.0L engine and 2008 6.2L engine, tighten the camshaft sprocket bolt a first pass to 55ft. lbs. (75 Nm), then tighten the camshaft sprocket bolt a final pass an additional 50 degrees.

    Click image to see an enlarged view

    Fig. Timing chain alignment

     

  16.  
  17. Apply a 5 mm bead of sealant GM P/N 12378190, 0.8 inch (20mm) long to the oil pan-to-engine block junction.
  18.  
  19. Install the front cover with a new gasket.
    1. Front cover bolts until snug.
    2.  
    3. Oil pan-to-front cover bolts until snug.
    4.  

  20.  
  21. Install tool J-41476 and crankshaft balancer bolt to the front cover. Align the tapered legs of the tool with the machined alignment surfaces on the front cover.
  22.  
  23. Install the crankshaft balancer bolt until snug. Tighten the oil pan-to-front cover bolts to 18 ft. lbs. (25 Nm) and the engine front cover bolts to 18 ft. lbs. (25 Nm).
  24.  
  25. Remove the tool.

    Click image to see an enlarged view

    Fig. Remove the Cover Alignment tool J-41476

  26.  
  27. Install or connect the following:

    New crankshaft front oil seal.
     
    Valve lifters
     
    Right and left cylinder heads
     
    Valve rocker arms and push rods
     
    Right and left valve rocker arm covers
     
    Coolant air bleed pipe
     
    Intake manifold
     
    Water pump
     
    Exhaust manifolds
     
    Oil level indicator tube
     
    Crankshaft balancer, refer to Crankshaft Balancer section.
     
    Engine assembly
     

  28.  

 
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