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 "
'("
, per-
pendicular to each olher. 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.
mtJ
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
va
lve guide, check the deflection.
mtJ
09900-20205: Micrometer
(0
- 25 mm)
~
Valve stem
0.0.
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.
em
09916
·4
4310: Valve guide removerlinstaller
NOTE:
..
Discard the removed valve guide.
• Only oversized valve guides are available as replacement
parls.
• Refinish the valve guide hol
es
In
the cylinder head u
si
ng the
valve
gu
id
e reamer and handle.
mil
09916--34580: Valve
guide
reamer
(1
0.8 mm)
09916--34542: Reamer handle
..
.
,
,
-
..
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