Kubota B1830 Workshop Manual page 154

B1830,B2230,B2530,B3030, WSM
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 specification
(Intake and exhaust)
IMPORTANT
• Do not hit the valve guide with a hammer during
replacement.
(A) When Removing
Valve Seating
1. Coat the valve face lightly with prussian blue and put the valve
on its seat to check the contact.
2. If the valve does not seat all the way around the valve seat or
the valve contact is less than 70 %, correct the valve seating as
follows.
3. If the valve contact does not comply with the reference value,
replace the valve or correct the contact of valve seating.
Valve seat width Factory specification
(1) Correct
(2) Incorrect
1-S53
ENGINE
7.010 to 7.025 mm
0.2760 to 0.2765 in.
(B) When Installing
9Y1210003ENS0080US0
2.12 mm
0.0835 in.
(3) Incorrect
9Y1210003ENS0081US0
KiSC issued 05, 2012 A