3-34 ENGINE
VALVE STEM DEFLECTION
• Lift the valve about 10 mm 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: 0.35 mm
09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
VALVE STEM WEAR
• If the valve stem is worn down to the limit, as measured with a
micrometer, replace the valve.
• If the stem is within the limit, then replace the guide.
• After replacing valve or guide, be sure to recheck the deflec-
tion.
Valve stem O.D.:
Standard (IN) : 3.975 – 3.990 mm
(EX): 3.955 – 3.970 mm
09900-20205: Micrometer (0 – 25 mm)
NOTE:
If valve guides have to be removed for replacement after
inspecting related parts, carry out the steps shown in valve
guide servicing. (
below)
VALVE GUIDE SERVICING
• Using the valve guide remover, drive the valve guide out
toward the intake or exhaust camshaft side.
09916-53310: Valve guide remover/installer
NOTE:
* Discard the removed valve guide subassemblies.
* Only oversized valve guides are available as replacement
parts. (Part No. 11115-11D70)
• Re-finish the valve guide holes in cylinder head with the
reamer and handle.
09916-49030: Valve guide reamer
09916-34542: Reamer handle
When refinishing or removing the reamer from the
valve guide hole, always turn it clockwise.
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