GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Camshaft

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Fig. Fig. 1 Camshaft and bearings

REMOVAL & INSTALLATION



For the removal of the camshaft the engine assembly must be removed from the vehicle.

  1. Remove the engine assembly from the vehicle.
  2.  
  3. Remove the rocker covers and remove the valve lifters.
  4.  
  5. Remove the front cover assembly, timing chain and sprockets.
  6.  
  7. Remove the camshaft by sliding it from the block,
  8.  

To install:

  1. Coat the camshaft journals with engine oil. Coat the camshaft lobes with gm Engine Oil Supplement (E.O.S) or equivalent.
  2.  
  3. Slide the camshaft into the block.
  4.  
  5. Install the timing chain and sprockets, making sure to align the timing marks.
  6.  
  7. Install the front cover assembly. Install the valve lifters.
  8.  
  9. Install the engine assembly into the vehicle. Run the engine and check for leaks.
  10.  

INSPECTION



  1. Check the camshaft sprocket, keyway and threads, bearing journals and lobes for wear, galling, gouges or overheating. If any of these conditions exist, replace the camshaft.
  2.  

Do not attempt to repair the camshaft. Always replace the camshaft and lifters as an assembly. Old valve lifters will destroy a new camshaft in less time than it took to replace the camshaft.

  1. Camshaft Lift Measurement:
  2.  
    1. Lubricate the camshaft bearings with Assembly Lube 1051396 or equivalent.
    2.  
    3. Carefully install the camshaft into the block. If the cam bearings are damaged badly, set the camshaft on `V' blocks instead.
    4.  
    5. Install a dial indicator J-8520 and measure the camshaft lift.
    6.  
    7. Measure the bearing journals with a micrometer. Take measurements for run-out and diameter. If not within specification in the `Camshaft' chart in the beginning of this Section, replace the camshaft.
    8.  



CAUTION
Always apply Assembly Lube (gm E.O.S 1052367 or equivalent) to the cam journals and lobes. If this procedure is not done, cam damage may result.

 
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