1-S30
ZD25F, WSM
ENGINE
Clearance between Valve Stem and Valve Guide
1. Remove carbon from the valve guide section.
2. Measure the valve stem O.D. with an outside micrometer.
3. Measure the valve guide I.D. with a small hole gauge, and
calculate the clearance.
4. If the clearance exceeds the allowable limit, replace the valves.
If it still exceeds the allowable limit, replace the valve guide.
W10311740
Replacing Valve Guide
(When removing)
1. Press out the used valve guide using a valve guide replacing tool.
(When installing)
1. Clean a new valve guide and valve guide bore, and apply engine
oil to them.
2. Press in a new valve guide using a valve guide replacing tool.
3. Ream precisely the I.D. of the valve guide to the specified
dimension.
IMPORTANT
• Do not hit the valve guide with a hammer during
replacement.
W10314690
Clearance between
valve stem and valve
guide
Factory spec.
0.035 to 0.065 mm
0.00138 to 0.00256 in.
Allowable limit
0.10 mm
0.0039 in.
Valve stem O.D. Factory spec.
6.960 to 6.975 mm
0.27402 to 0.27461 in.
Valve guide I.D. Factory spec.
7.010 to 7.025 mm
0.27599 to 0.27657 in.
Valve guide I.D.
(Intake and exhaust)
Factory spec.
7.010 to 7.025 mm
0.27599 to 0.27657 in.
(1) Intake Valve Guide
(2) Exhaust Valve Guide
(A) When Removing
(B) When Installing
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