Kubota WSM 07-E3B Series Workshop Manual page 189

07-E3B SERIES, WSM
Correcting Valve and Valve Seat
NOTE

• Before correcting the valve and seat, check the valve stem
and the I.D. of 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.
Valve face angle
Factory spec.
(Intake and exhaust)
2) Correcting Valve Seat
1. Slightly correct the seat surface with a 0.79 rad (45 °) valve seat
cutter.
2. Resurface the seat surface with a 0.26 rad (15 °) valve seat cutter
so that the width is close to specified valve seat width.
Valve seat width
Factory spec.
(Intake and exhaust)
3. 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.
4. Check the valve seating with prussian blue. The valve seating
surface should show good contact all the way around.
Valve seat angle
Factory spec.
(Intake and exhaust)
(1) Valve Seat Width
(2) Identical Dimensions
Free Length and Tilt of Valve Spring
1. Measure the free length (B) with vernier calipers.
measurement is less than the allowable limit, replace it.
2. Put the spring on a surface plate, place a square on the side of
the spring, and check to see if the entire side is contact with the
square. Rotate the spring and measure the maximum tilt (A). If
the measurement exceeds the allowable limit, replace.
3. Check the entire surface of the spring for scratches. Replace it,
if any.
Tilt (A) Allowable limit
V2607-DI-E3B
V2607-DI-T-E3B
Free length (B)
V3007-DI-T-E3B
V3307-DI-T-E3B
(A) Tilt
S-86
ENGINE
0.79 rad
45 °
3.3 to 3.6 mm
0.13 to 0.14 in.
0.79 rad
45 °
(A) Check Contact
(B) Correct Seat Width
(C) Check Contact
(a) 0.26 rad (15 °)
(b) 0.79 rad (45 °)
(c) 0.52 rad (30 °)
W10283500
1.0 mm
0.039 in.
Factory 35.4 to 35.9 mm
spec. 1.40 to 1.41 in.
Allowable 34.9 mm
limit 1.37 in.
Factory 35.1 to 35.6 mm
spec. 1.39 to 1.40 in.
Allowable 34.6 mm
limit 1.36 in.
(B) Free length
W1063303
KiSC issued 06, 2020 A
If the