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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 994 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Valve Rocker Arm, Shaft, and Push Rod Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Lubricate the rocker arm shaft (7) and the inside of the rocker arms with clean engine oil, if necessary.
  2. Install the rocker arm bracket (12) and bolt (1) on one end of the rocker arm shaft, if necessary.
  3. Install the intake rocker arm (9), spring (10), exhaust rocker arm (11), and bracket (12) with bolt (1). Continue in the same sequence to the last bracket, if necessary.
  4. Push the bracket (12) to compress the springs and then install the bolt (1), if necessary.
    5. Fig 1: View Of Rocker Arm Components
    GM667358Courtesy of GENERAL MOTORS CORP.
  5. Lubricate the top of the valves, the valve bridge stem, the valve lifter bridge, and the valve spring caps with clean engine oil.
  6. Install the valve bridge.
  7. Install the valve bridge pins.
  8. Lubricate the valve lifter end of the pushrod with clean engine oil.
    9. Fig 2: View Of Pushrods, Valve Spring Caps & Valve Lifter Bridges
    GM660488Courtesy of GENERAL MOTORS CORP.
  9. Install the pushrods.

    To ensure the pushrod is properly installed, gently pull up on the pushrod. Resistance should be felt from the pushrod trying to lift the valve lifter.

    10. NOTE: The pushrods must be correctly seated in the valve lifter and valve rocker arms before the rocker arm shaft assembly is torqued into place. Improper seating of the pushrods can cause damage to the pushrods or the valve rocker arm shaft assembly components.
  10. Install the rocker arm shaft assembly.
    11. Fig 3: View Of Rocker Arm Shaft Assembly
    GM663833Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  11. Tighten the rocker arm shaft bolts in the sequence shown.

    Tighten:  Tighten the bolts to 41 N.m (30 lb ft).

    12. Fig 4: Rocker Arm Shaft Bolts Tightening Sequence
    GM721463Courtesy of GENERAL MOTORS CORP.
  12. Adjust the valve clearance. Refer to Valve Lash Adjustment .
  13. Install the lower valve rocker arm covers. Refer to Valve Rocker Arm Cover Replacement - Lower Left  or Valve Rocker Arm Cover Replacement - Lower Right .
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