6-14 CYLINDER HEAD, CYLINDER AND PISTON
VALVE HEAD RADIAL RUNOUT
• Place the dial gauge at a right angle to the valve head face
and measure the valve head radial runout.
• If it measures more than the service limit, replace the valve.
Valve head radial runout (IN. & EX.):
Service Limit: 0.03 mm (0.001 in)
09900-20607: Dial gauge
09900-20701: Dial gauge chuck
09900-21304: V blocks
VALVE STEM AND VALVE FACE WEAR CONDITION
• Visually inspect each valve stem and valve face for wear and
pitting.
• If it is worn or damaged, replace the valve with a new one.
VALVE STEM DEFLECTION
• Lift the valve about 10 mm (0.39 in) from the valve seat.
• Measure the valve stem deflection in two directions, perpen-
dicular to each other, by positioning the dial gauge as shown.
• If the deflection measured exceeds the limit, then determine
whether the valve or the guide should be replaced with a new
one.
Valve stem deflection (IN. & EX.):
Service Limit: 0.25 mm (0.010 in)
09900-20607: Dial gauge
09900-20701: Dial gauge chuck
Be careful not to damage the valve head and valve
stem when handling it.
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