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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 38 (Engine Mechanical - 6.6L - Off Vehicle Repair Instructions (2 Of 3)) >> Off-Vehicle Repair Instructions (Part 2) >> Valve Lifters Cleaning and Inspection

Valve Lifters Cleaning and Inspection

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  1. Push the roller towards the roller lifter body and measure the distance between the bottom of the roller and the roller lifter body. The production value is 0.989-1.0 mm (0.0389-0.0394 in) and the service limit is 0.9 mm (0.0354 in).
    Fig 1: Measuring Distance Between Bottom Of Roller & Roller Lifter Body
    GM663574Courtesy of GENERAL MOTORS CORP.
  2. Replace the valve lifter if the measurement exceeds the service limit.
  3. Inspect the valve lifters for the following:
    • The valve lifter body for scuffing and wear
    • The valve lifter roller assembly for wear
    • The valve lifter roller for smooth rotation
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