• Remove the upper spring retainer, valve spring, lower spring seat, and valve stem oil seal. Note: remove the
parts and place them aside in order to aid reassembly.
• Remove the valve from the other side. Keep the intake valve and exhaust valve parts separate.
VALVE AND VALVE SPRING INSPECTION
• Inspect if the valves are bent or burned.
• Inspect if the action is smooth between the valve and the valve guide.
Measuring the outer diameter of the valve stem:
Service limit 4.9 mm 1.930 in.
Measuring the free length of the inner and outer valve spring:
Valve Inlet Valve Exhaust Valve
Inner spring 31.2 mm 31.2 mm (1.228 in.)
Outer spring 34.1 mm 34.1 mm (1.342 in.)
VALVE AND VALVE SPRING INSTALLATION
• Mount the spring retainer, valve guide oil seal.
• Replace the valve guide oil seal with a new one.
• After applying oil on the valve stem, mount it
• Mount the inner and outer valve springs.
• Mount the valve keeper with a spring compressor. 3-1-91
• When mounting, the twisting direction of the
inner and outer springs must be opposite, and cannot
• Seat the keepers on the valve by tapping the valve
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