Correcting Valve And Valve Seat - Kubota D1503-M Workshop Manual

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG 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.
[D1503-M, D1703-M, D1803-M, V2003-M, V2203-M, V2403-M,
V2403-M-T]
[D1703-M-BG, V2003-M-BG,
V2403-M-BG]
Factory
Valve face angle
spec.
[D1803-M-DI, V2403-M-DI, V2403-M-DI-T]
Factory
Valve face angle
spec.
2) Correcting Valve Seat
1. Slightly correct the seat surface with a 1.0 rad (60 °) or 0.79 rad
(45 °) valve seat cutter.
2. Resurface the seat surface with a 0.52 rad (30 °) valve seat cutter
or 0.26 rad (15 °) valve seat cutter to valve seat so that the width
is close to specified valve seat width (2.12 mm, 0.0835 in.).
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.
[D1503-M, D1703-M, D1803-M, V2003-M, V2203-M, V2403-M,
V2403-M-T]
[D1703-M-BG, V2003-M-BG,
V2403-M-BG]
Factory
Valve seat angle
spec.
[D1803-M-DI, V2403-M-DI, V2403-M-DI-T]
Factory
Valve seat angle
spec.
(1) Valve Seat Width
(2) Identical Dimensions
S-78
DIESEL ENGINE
V2003-M-T-BG, V2203-M-BG,
1.0 rad
IN.
60 °
0.79 rad
EX.
45 °
0.79 rad
IN.
45 °
0.79 rad
EX.
45 °
V2003-M-T-BG, V2203-M-BG,
1.0 rad
IN.
60 °
0.79 rad
EX.
45 °
0.79 rad
IN.
45 °
0.79 rad
EX.
45 °
(A) Check Contact
(B) Correct Seat Width
(C) Check Contact
(a) 0.26 rad (15 °) or 0.52 rad (30 °)
(b) 0.79 rad (45 °) or 1.0 rad (60 °)
(c) 0.52 rad (30 °) or 0.26 rad (15 °)
W10283500
KiSC issued 07, 2008 A