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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 Cleaning and Inspection >> Valve Spring Inspection and Measurement

Valve Spring Inspection and Measurement

WARNING: This page is about a different variant/trim than selected.
  1. Inspect the valve springs for broken coils or coil ends.
    2. Fig 1: Measuring Valve Spring Tension
    GM4960Courtesy of GENERAL MOTORS CORP.
  2. Use the J 9666  in order to measure the valve spring force. Refer to Engine Mechanical Specifications .
    3. IMPORTANT: Add a maximum of one shim up to 0.726 mm (0.030 in) thick to increase tension.
  3. If the valve spring tension is low, use a shim to increase tension.
  4. Recheck the valve spring tension, a valve spring that does not meet specification must be replaced.
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