Valve Spring Inspection
Valve Spring InspectionReference: Valves and Cylinder Head Disassembly and Reassembly:N32A
Valve Spring Free Length and Preload
Referring to data, check that each spring is in good 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: 42.5 - 45.5 mm (1.6732 - 1.7913 in.)
Limit: 42 mm (1.6535 in.)
Valve spring preload
Standard: 247 - 273 N (25.2 - 27.8 kgf) for 35 mm (55.5 - 61.4 lbf/1.378 in.)
Limit: 240 N (24.5 kgf / 54.0 lbf) for 35 mm (1.3780 in.)
