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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 >> Removal Procedure

Removal 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. Remove the lower valve rocker arm covers. Refer to Valve Rocker Arm Cover Replacement - Lower Left  or Valve Rocker Arm Cover Replacement - Lower Right .
  2. Loosen the valve clearance lock nuts on each rocker arm.
  3. Loosen the valve clearance adjusting screw on each rocker arm in order to relieve tension on the valvetrain.
    4. Fig 1: View Of Valve Clearance Adjusting Screws
    GM660481Courtesy of GENERAL MOTORS CORP.
  4. Remove the rocker arm shaft assembly bolts in the sequence shown. Leave the bolts in the rocker arm shaft brackets.
    5. Fig 2: Rocker Arm Shaft Assembly Bolts Removal Sequence
    GM660486Courtesy of GENERAL MOTORS CORP.
  5. Remove the rocker arm shaft assembly from the cylinder head.
    6. Fig 3: View Of Rocker Arm Shaft Assembly
    GM663833Courtesy of GENERAL MOTORS CORP.
  6. Remove the valve bridge pins.
  7. Remove the valve bridges.
  8. Remove the pushrods.
    9. Fig 4: View Of Pushrods, Valve Spring Caps & Valve Lifter Bridges
    GM660488Courtesy of GENERAL MOTORS CORP.
  9. Remove the rocker arm shaft bracket bolts (1), if necessary.
  10. Remove the bracket (12), rocker arm (11), and spring (10), if necessary.
  11. Remove the remaining rocker arms, springs, and brackets, if necessary.
    12. Fig 5: View Of Rocker Arm Components
    GM667358Courtesy of GENERAL MOTORS CORP.
  12. If required, clean and inspect the valve rocker arm and shaft. Refer to Valve Rocker Arm and Shaft Cleaning and Inspection .
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