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Installation Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Apply a liberal amount of clean engine oil GM P/N 12345501 (Canadian P/N 992704) or equivalent to the roller (2), lash adjuster and valve tip areas (1) of the camshaft followers.
    Fig 1: Locating Camshaft Followers Lubrication Areas
    G01816863Courtesy of GENERAL MOTORS CORP.

    Important:  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. Place the camshaft followers in position on the valve tip and lifter. The rounded head end of the follower goes on the lash adjuster while the flat end goes on the valve tip.
  3. Clean the camshaft journals and carriers with a clean, lint-free cloth.
    Fig 2: Installing Camshaft Followers
    G01816864Courtesy of GENERAL MOTORS CORP.

    Important:  Use the J 43032  in order to make sure that the crankshaft is in the TDC position.

  4. Select the proper camshaft for the particular installation location. The left cylinder head camshafts (1,2) are longer than those for the right cylinder head (3,4). However, both sets of camshafts share the same placement of identification rings. The ring placement is defined as follows:
    1. 4.1. The identification ring for the intake camshafts (1,3) is located between the first and second sets of lobes.
    2. 4.2. The identification ring for the exhaust camshafts (2,4) is located between the second and third sets of lobes.
    Fig 3: Identifying Camshaft Identification Rings
    G01816865Courtesy of GENERAL MOTORS CORP.
  5. Apply a liberal amount of clean engine oil GM P/N 12345501 (Canadian P/N 992704) or equivalent to the camshaft journals and the cylinder head camshaft carriers.
  6. Place the intake (1) and exhaust (2) camshafts in position in the cylinder head.
  7. Position the camshaft lobes in a neutral position with the front notch for the camshaft sprocket drive pins near the top of their rotation and the rear flats of the camshaft near the installation position of the J 42038.
    Fig 4: Installing Camshafts
    G01816866Courtesy of GENERAL MOTORS CORP.
  8. Observe the markings on the bearing caps. Each bearing cap is marked in order to identify its location. The markings have the following meanings:
    • The raised feature must always be oriented toward the outboard of the engine.
    • The "l" indicates the intake camshaft.
    • The "E" indicates the exhaust camshaft.
    • The number indicates the journal position from the front of the engine.
    Fig 5: Identifying Camshaft Markings
    G01816867Courtesy of GENERAL MOTORS CORP.
  9. Install the camshaft bearing thrust caps in the first journal of each camshaft. The thrust caps are wider than the others and have machined undercuts not present on the other caps. Make sure the orientation marking is closest to the engine valley.
  10. Install the remaining bearing caps with their orientation mark closest to the engine valley.
  11. Hand start all the camshaft bearing cap bolts.
    CAUTION: Refer to FASTENER NOTICE in Cautions and Notices.
  12. Tighten the camshaft bearing caps.

    Tighten 

    1. 12.1. Tighten the camshaft bearing cap bolts to 8 N.m (71 lb in).
    2. 12.2. Use the J 36660-A  in order to tighten the camshaft bearing cap bolts an additional 22 degrees.
    Fig 6: Installing Camshaft Bearing Thrust Caps
    G01816868Courtesy of GENERAL MOTORS CORP.

    Important:  There should be no need to rotate the camshaft more than 10 degrees.

  13. Using the hex cast into the camshaft, rotate the camshaft so the rear camshaft flat is facing the cylinder head.
  14. Install the J 42038  at the rear of the cylinder head.
    Fig 7: Installing J 42038
    G01816869Courtesy of GENERAL MOTORS CORP.

    Important:  The camshafts must be locked in place using the J 42038  before installation of the secondary timing chain.

  15. Make sure the locking tool is fully seated and locked onto the camshafts.
    Fig 8: Identifying J 42038
    G01816870Courtesy of GENERAL MOTORS CORP.
  16. Compress the secondary timing chain tensioner shoes with your hand.
  17. Lock the tensioner by inserting a piece of wire (2) into the access hole in the side of the tensioner (1).
  18. Slowly release pressure on the tensioner shoes. The tensioner should remain compressed.
    Fig 9: Locking Secondary Timing Chain Tensioner
    G01816871Courtesy of GENERAL MOTORS CORP.
  19. Slide the intake and exhaust camshaft sprockets off of the J 42042  and onto their respective camshafts and align the drive pins (1) in the camshafts.
    Fig 10: Identifying Right Secondary Camshaft Timing Components Position
    G01816872Courtesy of GENERAL MOTORS CORP.
  20. Remove the J 42042  from the left cylinder head.
  21. Install the intake camshaft sprocket bolts and exhaust camshaft sprocket bolt.

    Tighten 

    1. 21.1. Tighten the camshaft sprocket bolts to 25 N.m (18 lb ft).
    2. 21.2. Use the J 36660-A  in order to tighten the camshaft bearing cap bolts an additional 45 degrees.
  22. Remove the locking wire from the secondary timing chain tensioner allowing the tensioner shoes to expand and apply pressure to the timing chain.
    Fig 11: Removing J 42042
    G01816873Courtesy of GENERAL MOTORS CORP.
  23. Remove the J 42038  from the left camshafts.
  24. Install the left camshaft cover. Refer to Camshaft Cover Replacement - Left .
    Fig 12: Identifying J 42038
    G01816874Courtesy of GENERAL MOTORS CORP.
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