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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1678 (Engine Mechanical - 6.6L (LMM) - Repair Instructions - On Vehicle) >> Valve Rocker Arm, Shaft, and Push Rod Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Valve Clearance Adjusting Screw
    GM660481Courtesy of GENERAL MOTORS CORP.
  1. Remove the lower valve rocker arm covers. Refer to Valve Rocker Arm Lower Cover Replacement - Left Side  or Valve Rocker Arm Lower Cover Replacement - Right Side .
  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 2: Rocker Arm Shaft Bolts Loosening Sequence
    GM660486Courtesy 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 3: View Of Rocker Arm Shaft
    GM663833Courtesy of GENERAL MOTORS CORP.
  5. Remove the rocker arm shaft assembly from the cylinder head.
    6. Fig 4: View Of Pushrods, Valve Spring Caps & Valve Lifter Bridges
    GM660488Courtesy of GENERAL MOTORS CORP.
  6. Remove the valve bridge pins.
  7. Remove the valve bridges.
  8. Remove the pushrods.
    9. Fig 5: View Of Rocker Arm Components
    GM667358Courtesy 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. 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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