5-25
VALVES AND VALVE SPRINGS
ENG
NOTE:
Valve spring compressor
90890-04019, YM-04019
Valve spring compressor
attachment
90890-04108, YM-01253
4. Remove:
S upper spring seat
1
S valve spring outer
2
S valve spring inner (intake only)
3
S valve
4
S valve stem seal
5
S lower spring seat
6
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
EAS00239
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.
1. Measure:
S valve-stem-to-valve-guide clearance
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter
a
–
Valve stem diameter
b
Out of specification ! Replace the valve
guide.
Valve-stem-to-valve-guide
clearance
Intake
0.010 X 0.037 mm
(0.0004 X 0.0015 in)
<Limit>: 0.08 mm (0.0031 in)
Exhaust
0.025 X 0.052 mm
(0.0010 X 0.0020 in)
<Limit>: 0.10 mm
(0.0039 in)
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