Valve and Valve Springs
VALVES1. Clean valves thoroughly and discard burned, warped and cracked valves.
2. Measure valve stems for wear. Measure stem about 60 mm beneath the valve lock grooves.
3. If valve stems are worn more than 0.05 mm (0.002 inch), replace the valve.
VALVE SPRINGS
1. Whenever valves have been removed for inspection, reconditioning or replacement, valve springs should be tested for correct tension. Discard the springs that do not meet specifications. The following specifications apply to both intake and exhaust valves springs:
- Valve Closed Nominal Tension-76 lbs. @ 38.0 mm (1.50 inch)
- Valve Open Nominal Tension-136 lbs. @ 29.75 mm (1.17 inch)
2. Inspect each valve spring for squareness with a steel square and surface plate, test springs from both ends. If the spring is more than 1.5 mm (1/16 inch) out of square, install a new spring.