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Camshaft Installation - Left Side (LF4)

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    Fig 1: Camshaft Sealing Rings In Camshaft Grooves
    GM1306287Courtesy of GENERAL MOTORS COMPANY
  1. Ensure that the camshaft sealing rings (1) are in place in the camshaft grooves. Camshaft sealing rings must be in place below the surface of the camshaft journal in order to avoid being pinched between the cylinder head and the camshaft caps.
    2. Fig 2: Applying Lubricant To Camshaft Journals & Left Cylinder Head Camshaft Carriers
    GM1978038Courtesy of GENERAL MOTORS COMPANY
  2. Apply a liberal amount of lubricant to the camshaft journals and the left cylinder head camshaft carriers. Refer to Adhesives, Fluids, Lubricants, and Sealers (LF4) for recommended lubricant.
    3. Fig 3: Positioning Left Intake And Exhaust Camshafts In Left Cylinder Head
    GM1977898Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The left intake camshaft has a laser inscription marking on the rear of the shaft to identify it as left bank intake (LI).

  3. Place the left intake and left exhaust camshafts in position in the left cylinder head.
    4. Fig 4: Camshaft Neutral (Low Tension) Position
    GM1306293Courtesy of GENERAL MOTORS COMPANY
  4. Position the camshaft lobes in a neutral position with the flats on the back of the camshafts up and parallel (1) with the left cylinder head camshaft cover rail.
    5. Fig 5: Left Cylinder Head Camshaft Bearing Cap Markings
    GM2537337Courtesy of GENERAL MOTORS COMPANY
  5. Observe the markings on the left cylinder head camshaft bearing caps. Each bearing cap is marked in order to identify its location. The markings have the following meanings:
    • The raised feature (1) must always be oriented toward the center of the cylinder head.
    • The I indicates the intake camshaft.
    • The E indicates the exhaust camshaft.
    • The number 2, 4, 6 indicates the cylinder position from the front of the engine.
  6. Apply a liberal amount of lubricant to the camshaft bearing caps. Refer to Adhesives, Fluids, Lubricants, and Sealers (LF4) for recommended lubricant.
    7. Fig 6: Camshaft Bearing Cap And Camshaft Thrust Surface
    GM2537341Courtesy of GENERAL MOTORS COMPANY
  7. Apply a liberal amount of lubricant to the camshaft bearing cap (1) and camshaft thrust surface (2). Refer to Adhesives, Fluids, Lubricants, and Sealers (LF4) for recommended lubricant.
    8. Fig 7: Camshaft Bearing Caps And Bolts
    GM2537349Courtesy of GENERAL MOTORS COMPANY
  8. Install the camshaft bearing thrust cap (1) in the first journal of the left cylinder head.
  9. Install the remaining bearing caps (2) with their orientation mark toward the center of the cylinder head.
  10. Hand start all the camshaft bearing cap bolts.
    11. Fig 8: Camshaft Bearing Cap Bolt Tightening Sequence
    GM1978043Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  11. Tighten the camshaft bearing cap bolts in the sequence shown and tighten to 10 N.m (89 lb in).
  12. Loosen the center intake camshaft bearing cap bolts 1, 2 and the center exhaust camshaft bearing cap bolts 3, 4.
  13. Retighten the center camshaft bearing cap bolts 1, 2, 3, 4 and retighten the camshaft bearing cap bolts to 10 N.m (89 lb in).
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