Clearance Between Valve Stem And Valve Guide; Replacing Valve Guide - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service

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. of the cylinder head at the most
wear part as shown in the figure below 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.
Factory
spec.
Clearance between
valve stem and guide
Allowable limit
Factory
Valve stem O.D.
spec.
Factory
Valve guide I.D.
spec.

Replacing Valve Guide

(When removing)
1. Using a valve guide replacing tool, press out the used valve
guide.
(When installing)
1. Clean a new valve guide, and apply engine oil to it.
2. Using a valve guide replacing tool, press in a new valve guide
until it is flush with the cylinder head as shown in the figure.
3. Ream precisely the I.D. of the valve guide to the specified
dimension.
IMPORTANT
• Do not hit the valve guide with a hammer, etc. during
replacement.
(A) When Removing
III-S-148
Intake 0.055 to 0.085 mm
valve 0.0022 to 0.0033 in.
Exhaust 0.055 to 0.085 mm
valve 0.0022 to 0.0033 in.
0.1 mm
0.0039 in.
Intake 6.960 to 6.975 mm
valve 0.2740 to 0.2746 in.
Exhaust 6.960 to 6.975 mm
valve 0.2740 to 0.2746 in.
Intake 7.030 to 7.045 mm
valve 0.2768 to 0.2774 in.
Exhaust 7.030 to 7.045 mm
valve 0.2768 to 0.2774 in.
W1061883
(B) When Installing
W1062212
Engine