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Valve Spring Inspection and Measurement

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. Inspect the valve springs for broken coils or coil ends.
  2. Use the J 9666  in order to measure the valve spring force. Refer to Engine Mechanical Specifications .
    3. Fig 1: Measuring Valve Spring Tension
    GM4960Courtesy of GENERAL MOTORS CORP.
    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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