Kubota ZD221-48 Workshop Manual page 114

ZD221 , WSM ENGINE
(A) (8)
3EEABAB1 P117A
3TMABABl P059A
o o
(1 ) (2)
(3)
3TMABAB1 P060A
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 1.0. 6.010 to 6.025 mm
Factory spec.
(Intake and exhaust) 0.2366 to 0.2372 in.
• IMPORTANT
• Do not hit the valve guide with a hammer during
replacement.
(A) When Removing
(B) When Installing
W10278890
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.
2,12 mm
Valve seat width Factory spec.
0.0835 in.
(1) Correct (3) Incorrect
(2) Incorrect
W10282190
1-S42