Kubota WSM F2880 Workshop Manual page 104

F2880, F3680, RCK72-F36, RCK72R-F36, RCK60-F36, RCK60R-F36, WSM
Cylinder Head Flaw
1. Prepare an air spray red check.
2. Clean the surface of the cylinder head with detergent (2).
3. Spray the cylinder head surface with the red permeative liquid
(1). Leave it five to ten minutes after spraying.
4. Wash away the read permeative liquid on the cylinder head
surface with the detergent (2).
5. Spray the cylinder head surface with white developer (3).
6. If flawed, it can be identified as red marks.
(1) Red Permeative Liquid
(2) Detergent
Valve Recess
1. Clean the cylinder head surface, valve face and valve seat.
2. Insert the valve into the valve guide.
3. Measure the valve recess with a depth gauge.
4. If the measurement exceeds the allowable limit, replace the
valve.
5. If it still exceeds the allowable limit after replacing the valve,
replace the cylinder head.
Factory spec.
Valve recess
Allowable limit
(1) Cylinder Head Surface
Clearance between Valve Stem and Valve Guide
1. Remove carbon from the valve stem.
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.
1-S38
ENGINE
(3) White Developer
W1076542
0.05 (protrusion) to
0.25 (recessing) mm
0.0020 (protrusion) to
0.0098 (recessing) in.
0.40 (recessing) mm
0.0157 (recessing) in.
(A) Recess
(B) Protrusion
W10768800
0.035 to 0.065 mm
0.0014 to 0.0025 in.
0.10 mm
0.0039 in.
6.960 to 6.975 mm
0.2741 to 0.2746 in.
7.010 to 7.025 mm
0.2760 to 0.2765 in.
W10774950
KiSC issued 04, 2006 A