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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 7.4L V8 - VIN [N] >> Overhaul >> Valve Springs

Valve Springs

  1. Measure valve spring free length, installed height and pressure (tension). Replace valve spring if not within specification. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS.
  2. Measure installed height between cylinder head spring seat (or top of shim, if shimmed) and top of spring. If installed height exceeds specification, install shims as necessary to bring installed height to specification. Ensure installed height is not less than specified.
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