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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Mechanical - 4.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Valve Spring Inspection and Measurement >> Tools Required

Tools Required

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J 22738-B  Valve Spring Tester. See Special Tools .

    Fig 1: Inspecting Valve Spring
    GM1254502Courtesy of GENERAL MOTORS CORP.
  1. Place the valve spring in the J 22738-B  . See Special Tools .
  2. Compress the J 22738-B  to the valve open, valve spring compressed, dimension listed in the Engine Mechanical Specifications . See Special Tools .
    3. NOTE: DO NOT use shims in order to increase valve spring load. The use of shims will cause the valve spring to bottom out before the camshaft lobe is at peak lift and engine damage could result.
  3. If low valve spring load is found to be too low, replace the valve spring, DO NOT shim.
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