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VALVES AND VALVE SPRINGS
INSPECTION
Valve
1. Measure:
2. Replace:
Replacement steps:
NOTE:
To ease guide removal, installation and to
maintain correct fit heat the cylinder head in
an over to 100 ˚C (212 ˚F).
NOTE:
After replacing the valve guide reface the
valve seat.
4 - 26
Stem-to-guide clearance
Stem-to-guide clearance =
valve guide inside diameter a –
valve stem diameter b
Out of specification → Replace the
valve guide.
Clearance (stem to guide):
Intake:
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
<Limit>: 0.08 mm (0.0031 in)
Exhaust:
0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)
<Limit>: 0.10 mm (0.0040 in)
Valve guide
Remove the valve guide using a valve
guide remover 1.
Install the new valve guide using a valve
guide remover and valve guide installer.
After installing the valve guide, bore the
valve guide using a valve guide reamer 2
to obtain proper stem-to-guide clearance.
Valve guide remover (5.0 mm):
YM-04097/90890-04097
Valve guide installer:
YM-04098/90890-04098
Valve guide reamer (5.0 mm):
YM-04099/90890-04099
ENG
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