S10 Pickup, Sonoma 2000-2004

Camshaft, Bearings & Lifters

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Inspection



Camshaft & Bearings
2.2L Engine
  1. Measure the camshaft journals with a micrometer. If journals are more than 0.025 mm (0.0010 in) out-of-round, replace the camshaft.
  2.  
  3. Measure camshaft runout using a dial indicator.
  4.  
  5. Mount the camshaft in wooden V-blocks or between centers on a fixture.
  6.  
  7. Use a dial indicator to check the intermediate camshaft journal.
  8.  
  9. If runout exceeds 0.05 mm (0.002 in), camshaft is excessively bent and should be replaced.
  10.  

4.3L Engine
  1. Clean the engine camshaft in cleaning solvent.
  2.  
  3. Dry the engine camshaft with compressed air.
  4.  
  5. Inspect the camshaft retainer plate for damage. If the camshaft retainer plate is damaged, replace as necessary.
  6.  
  7. Inspect the camshaft bearings for correct fit into the engine block camshaft bearing bores. The camshaft bearings have an interference fit to the engine block camshaft bearing bores and must not be loose in the engine block camshaft bearing bores.
  8.  
  9. Inspect the camshaft bearings for excessive wear or scoring. If any camshaft bearing is excessively worn or scored, replace all the camshaft bearings.
  10.  
  11. Inspect the engine camshaft for the following:

    Worn, scored, or damaged bearing journals 
     
    Worn engine camshaft lobes 
     
    Damaged bolt hole threads 
     
    Damaged camshaft sprocket locator pin 
     

  12.  
  13. Measure the engine camshaft journals with a micrometer. If the camshaft journals are more than 0.025 mm (0.0010 in) out-of-round, then replace the engine camshaft.
  14.  
  15. Measure for a bent engine camshaft or excessive engine camshaft runout using a magnetic base dial indicator. Check the intermediate engine camshaft journals. If the runout exceeds 0.065 mm (0.0026 in), the engine camshaft is bent and must be replaced.
  16.  

Removal & Installation



4.3L Engine
  1. Properly relieve the fuel system pressure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the engine cooling system.
  6.  
  7. Discharge and recover the refrigerant from the air conditioning system.
  8.  
  9. Remove or disconnect the following:

    Radiator
     
    Air conditioning condenser
     
    Rocker arm covers
     
    Intake manifold assembly
     
    Rocker arms, pushrods and lifters
     
    Crankshaft pulley and hub
     
    Engine front (timing) cover
     

  10.  
  11. Align the timing marks on the crankshaft and camshaft sprockets.
  12.  
  13. Remove or disconnect the following:
    NOTE
    Take care not to damage the camshaft bearings when removing the camshaft.



    Camshaft sprocket and timing chain
     
    Balance shaft drive gear, if equipped
     
    Camshaft thrust plate
     
    Camshaft by installing the sprocket bolts or longer bolts the camshaft end to act as a handle; then, remove the camshaft while turning slightly from side to side, as necessary.
     



    Click image to see an enlarged view

    Fig. Thread 3 long bolts into the camshaft to use as a handle, then withdraw it from the engine

  14.  

To install:

  1. Lubricate the camshaft journals with clean engine oil or a suitable pre-lube.
  2.  
  3. Install or connect the following:

    Camshaft being extremely careful not to contact the bearings with the cam lobes
     
    Thrust plate. Torque the bolts to 106 inch lbs. (12 Nm).
     
    Balance shaft drive gear, if equipped
     
    Timing chain and camshaft sprocket
     
    Engine front (timing) cover
     
    Crankshaft pulley and hub
     
    Valve lifters, pushrods and rocker arms. Adjust the valve clearance.
     
    Intake manifold assembly
     
    Rocker arm covers
     
    Radiator
     
    Negative battery cable
     

  4.  
  5. Refill the engine cooling system.
  6.  

 
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