Clearance Between Valve Stem And Valve Guide; Replacing Valve Guide - Kubota D1503-M Workshop Manual

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG 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.
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.
(See page "SPECIAL TOOLS".)
(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 spec.
(Intake and exhaust)
IMPORTANT
• Do not hit the valve guide with a hammer during
replacement.
(A) When Removing
S-76
DIESEL ENGINE
0.040 to 0.070 mm
0.0016 to 0.0027 in.
0.10 mm
0.0039 in.
7.960 to 7.975 mm
0.3134 to 0.3139 in.
8.015 to 8.030 mm
0.3156 to 0.3161 in.
W10774950
8.015 to 8.030 mm
0.3156 to 0.3161 in.
(B) When Installing
W10278890
KiSC issued 07, 2008 A