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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Cylinder Head Assemble >> Checking Valve Spring Installed Height

Checking Valve Spring Installed Height

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Spring Cap, Valve Rotator, Valve & Valve Stem Keys
    GM635681Courtesy of GENERAL MOTORS CORP.
  1. Install the valve rotator (3), the valve (4), the valve spring cap (1) and the valve stem keys (5) into the cylinder head.
  2. Using a snap gage or inside micrometer, measure the distance from the top of the valve rotator to the bottom of the valve spring cap. Refer to Engine Mechanical Specifications  for proper valve spring installed height specifications.
    3. IMPORTANT:
    • Never shim the spring to obtain an installed height under the specified amount.
    • Install the valve spring seat shims under the rotator, between the rotator and the cylinder head spring seat.
    • Add a maximum of one valve spring seat shim, up to 0.726 mm (0.030 in) thick to achieve the valve spring installed height specification.
  3. Install a valve spring seat shim if the valve spring installed height measurement is above the specification.
  4. Recheck the valve spring installed height, replace the cylinder head if the valve spring installed height cannot be obtained.
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