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Measurement Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the valve spring tension using the J 9666.  Refer to Engine Mechanical Specifications  .
  2. If low valve spring load is found, replace the valve springs. DO NOT use shims to increase spring load. The use of shims will cause the valve spring to bottom out before the camshaft lobe is at peak lift.
    Fig 1: Measuring Valve Spring Tension
    G01815884Courtesy of GENERAL MOTORS CORP.
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