Kubota B1220 Workshop Manual page 110

B1220, B1620, B1820, WSM
Replacing Valve Guide
(When removing)
1. Press out the used valve guide using a valve guide replacing
tool. (Refer to "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-S41
ENGINE
6.010 to 6.025 mm
0.2367 to 0.2372 in.
(B) When Installing
9Y1210272ENS0061US0
2.12 mm
0.0835 in.
(3) Incorrect
9Y1210272ENS0062US0
KiSC issued 07, 2011 A
(EU)