Kubota WSM J Series Workshop Manual page 124

J SERIES, WSM
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.
[Z482, D722]
Factory spec.
Clearance between
valve stem and valve
guide
Allowable limit
Valve stem O.D. Factory spec.
Valve guide I.D. Factory spec.
[D1005, V1305]
Factory spec.
Clearance between
valve stem and valve
guide
Allowable limit
Valve stem O.D. Factory spec.
Valve guide I.D. Factory spec.
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.
Valve guide I.D. Factory
(Intake and exhaust) spec.
IMPORTANT

• Do not hit the valve guide with a hammer during
replacement.
(A) When Removing
S-78
ENGINE
0.030 to 0.057 mm
0.00118 to 0.00224 in.
0.10 mm
0.0039 in.
5.968 to 5.980 mm
0.23496 to 0.23543 in.
6.010 to 6.025 mm
0.23661 to 0.23720 in.
0.035 to 0.065 mm
0.00138 to 0.00256 in.
0.10 mm
0.0039 in.
6.960 to 6.975 mm
0.27402 to 0.27461 in.
7.010 to 7.025 mm
0.27599 to 0.27657 in.
W10311740
Z482 6.010 to 6.025 mm
D722 0.23661 to 0.23720 in.
D1005 7.010 to 7.025 mm
V1305 0.27599 to 0.27657 in.
(B) When Installing
W10314690
KiSC issued 10, 2016 A