Kubota L2800 Workshop Manual page 130

L2800, L3400, WSM
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland
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.
Clearance between
valve stem and guide
Valve stem O.D.
Valve guide I.D.
Replacing Valve Guide
(A) (When removing)
1. Press out the used valve guide using a valve guide replacing tool.
(B) (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.
(Intake and exhaust)
IMPORTANT
• Do not hit the valve guide with a hammer during
replacement.
(A) When Removing
1-S43
0.040 to 0.070 mm
Factory spec.
0.00157 to 0.00276 in.
0.1 mm
Allowable limit
0.0039 in.
7.960 to 7.975 mm
Factory spec.
0.31339 to 0.31398 in.
8.015 to 8.030 mm
Factory spec.
0.31555 to 0.31614 in.
8.015 to 8.030 mm
Factory spec.
0.31555 to 0.31614 in.
(B) When Installing
ENGINE
W1077495
W1027889
KiSC issued 08, 2007 A