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Installation Procedure

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    Fig 1: Identifying Roller Pivot Pocket & Valve Slot Areas Of Camshaft Followers
    GM235196Courtesy of GENERAL MOTORS COMPANY
  1. Apply a liberal amount of lubricant to the roller pivot pocket (2) and valve slot areas (1) of the camshaft followers. Refer to Adhesives, Fluids, Lubricants, and Sealers .
    2. Fig 2: Identifying the Stationary Hydraulic Lash Adjusters
    GM522872Courtesy of GENERAL MOTORS COMPANY
    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. Place the camshaft followers in position on the valve tip and the stationary hydraulic lash adjusters (SHLA) (1). The rounded head of the follower goes on the SHLA, while the flat end goes on the valve tip.
  3. Clean the camshaft carriers with a clean, lint-free cloth.
    4. Fig 3: Identifying Camshaft Lobes & Journals
    GM522807Courtesy of GENERAL MOTORS COMPANY
  4. Apply a liberal amount of lubricant to the camshaft carriers, camshaft lobes (1) and the camshaft journals (2). Refer to Adhesives, Fluids, Lubricants, and Sealers .
  5. 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.
    6. Fig 4: Identifying Camshaft Bearing Cap Markings
    GM53008Courtesy of GENERAL MOTORS COMPANY
  6. 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.
  7. Apply a liberal amount of lubricant to the camshaft bearing caps. Refer to Adhesives, Fluids, Lubricants, and Sealers .
    8. Fig 5: View of Camshaft Bearing Caps
    GM522860Courtesy of GENERAL MOTORS COMPANY
  8. Install the camshaft bearing caps according to the identification marks.
    9. Fig 6: Camshaft Bearing Cap Bolt Installation Sequence
    GM522804Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  9. Install the camshaft bearing cap bolts in sequence.

    Tighten 

    1. Alternately hand tighten the camshaft bearing cap bolts a few turns at a time until all caps are fully seated.
    2. Tighten the camshaft bearing cap bolts to 5 N.m (44 lb in).
    3. Tighten the camshaft bearing cap bolts an additional 30 degrees using the J 45059
    10. CAUTION:

    Refer to Torque Reaction Against Timing Drive Chain Caution .

  10. Align the camshafts.
    11. Fig 7: Using Camshaft Holding Tool
    GM650538Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Camshaft Holding Tool Warning .

  11. Install the J 44212 over the camshafts.
    12. NOTE:

    Ensure the camshaft sprockets properly engage the camshaft sprocket drive pins and camshafts.

  12. Install the intake and exhaust camshaft sprockets aligning the paint marks made during disassembly. Ensure that the camshaft sprockets align with the pins of the camshafts.
    13. Fig 8: Holding Camshaft
    GM749356Courtesy of GENERAL MOTORS COMPANY
  13. 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.
    14. Fig 9: Identifying Left Intake Camshaft Sprocket Bolt
    GM650547Courtesy of GENERAL MOTORS COMPANY
  14. Install the camshaft sprocket bolts.

    Tighten 

    Tighten the camshaft sprocket bolts to 120 N.m (89 lb ft).

    15. Fig 10: Identifying Timing Chain Retention Tool Components
    GM1275725Courtesy of GENERAL MOTORS COMPANY
  15. Remove the EN 46327 (1).
    16. Fig 11: Camshaft Sprocket Drive Pins At The Top Of Their Rotation
    GM517149Courtesy of GENERAL MOTORS COMPANY
  16. Verify the camshaft sprocket alignment.
    17. Fig 12: Using Camshaft Holding Tool
    GM650538Courtesy of GENERAL MOTORS COMPANY
  17. Remove the J 44212 from the camshafts.
  18. Install the left camshaft cover. Refer to Camshaft Cover Replacement - Left Side .
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