Valve Spring Inspection
Precautions: General safety (00)
Valve Spring Free Length and Preload
•Check each valve spring for breakage or weakening.
•Measure valve spring free length and preload.
If measured value is less than limit, replace valve spring.
•Measure valve spring free length and preload.
If measured value is less than limit, replace valve spring.
NOTE:
Weakened valve spring can cause chatter, not to mention possibility of reducing power output due to gas leakage caused by decreased seating pressure.
Valve spring free length (Reference)
44.1 mm (1.73 in.)
Valve spring preload
228 – 252 N (23.2 – 25.7 kgf, 51.3 – 56.7 lbf) for 34.0 mm (1.339 in.)
439 – 481 N (44.8 – 49.0 kgf, 98.7 – 108.1 lbf) for 25.5 mm (1.004 in.)
