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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (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 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. Install the valve rotator (3), the valve (4), the valve spring cap (1) and the valve stem keys (5) into the cylinder head.
    2. Fig 1: View Of Spring Cap, Valve Rotator, Valve & Valve Stem Keys
    GM635681Courtesy of GENERAL MOTORS CORP.
  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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