Valve Spring: Testing and Inspection
Valve Spring InspectionValve Spring Free Length and Preload
Referring to data, check to be sure that each spring is in sound condition, free of any evidence of breakage or weakening. Remember, weakened valve springs can cause chatter, not to mention possibility of reducing power output due to gas leakage caused by decreased seating pressure.
Valve spring free length
Standard: 51.13 mm (2.013 in.)
Limit: 50.13 mm (1.974 in.)
Valve spring preload
Standard: 209 - 241 N (20.9 - 24.1 kgf) for 37.60 mm (46.1 - 53.1 lb/1.480 in.)
Limit: 208 N (20.8 kgf) for 37.60 mm (45.9 lb/1.480 in.)
Spring Squareness
Use a square and surface plate to check each spring for squareness in terms of clearance between end of valve spring and square. Valve springs found to exhibit a larger clearance than limit must be replaced.
Valve spring squareness
Limit: 2.2 mm (0.087 in.)
