Kubota WSM J Series Workshop Manual page 125

J SERIES, WSM
Correcting Valve and Valve Seat
NOTE

• Before correcting the valve and seat, check the valve stem
and the I.D. of the valve guide section, and repair them if
necessary.
• After correcting the valve seat, be sure to check the valve
recessing.
1) Correcting Valve
1. Correct the valve with a valve refacer.
2) Correcting Valve Seat
1. Slightly correct the seat surface with seat cutter (Code No.
07909-33102).
[Z482, D722]
Intake Valve
Exhaust Valve
[D1005, V1305]
Intake Valve
Exhaust Valve
1. Resurface the seat surface with a 0.52 rad. (30) valve seat cutter
to intake valve seat and with a 0.26 rad. (15) valve seat cutter to
exhaust valve seat so that the width is close to specified valve
seat width (2.12 mm, 0.0835 in.).
2. After resurfacing the seat, inspect for even valve seating, apply a
thin film of compound between the valve face and valve seat, and
fit them with valve lapping tool.
3. Check the valve seating with prussian blue. The valve seating
surface should show good contact all the way around.
(a) Identical Dimensions
(b) Valve Seat Width
(c) 0.52 rad. (30) or 0.26 rad. (15)
(d) 0.26 rad. (15) or 0.52 rad. (30)
(e) 0.79 rad. (45) or 1.05 rad. (60)
S-79
0.79 rad
Factory spec.
0.79 rad
Factory spec.
1.05 rad
Factory spec.
0.79 rad
Factory spec.
(A) Check Contact
(B) Correct Seat Width
(C) Check Contact
KiSC issued 10, 2016 A
ENGINE
45
45
60
45
W10319540