Valve Spring: Inspection

With valve spring removed, check spring tension while compressed to specified length in a suitable spring tester. Check valve spring free length, if less than specified, springs must be replaced. See Valve Springs specification table  for correct specifications. Check valve spring squareness with a steel square. If inner spring is out of square more than 0.063" (1.6 mm) or outer spring is out of square more than 0.074" (1.9 mm) valve springs must be replaced.