3-22 ENGINE
VALVE STEM DEFLECTION
Lift the valve about 10 mm (0.39 in) from the valve seat. Mea-
sure the valve stem deflection in two directions, “X” and “Y”, per-
pendicular to each other. Position the dial gauge as shown. If
the deflection exceeds the service limit, determine whether the
valve or the guide should be replaced with a new one.
& 09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
% Valve stem deflection
Service Limit: 0.35 mm (0.014 in)
VALVE STEM WEAR
Measure the valve stem outside diameter using the micrometer.
If the outside diameter is not within the specified value, replace
the valve with a new one. If the valve stem outside diameter is
within specification, but the valve stem deflection is not, replace
the valve guide with a new one. After replacing the valve or
valve guide, check the deflection.
& 09900-20205: Micrometer (0 – 25 mm)
% Valve stem O.D.
Standard
IN: 4.975 – 4.990 mm (0.1959 – 0.1965 in)
EX: 4.955 – 4.970 mm (0.1951 – 0.1957 in)
VALVE GUIDE SERVICING
• Drive the valve guide out toward the camshaft side using the
valve guide remover.
& 09916-44310: Valve guide remover/installer
NOTE:
* Discard the removed valve guide.
* Only oversized valve guides are available as replacement
parts.
• Refinish the valve guide holes in the cylinder head using the
valve guide reamer and handle.
& 09916-34580: Valve guide reamer (10.8 mm)
09916-34542: Reamer handle
X
Y
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