Adjusting Valve Angle; Adjusting Valve Seat - Kubota WSM 05-E4B Series Workshop Manual

4. ENGINE

6.8 Adjusting valve angle

NOTE
• Before you adjust the valve, check the valve
stem and measure the I.D. of the valve guide
section.
Repair them if necessary.
Tools required
• Valve refacer
1. Adjust the valve with a valve refacer.
Valve face an- Service speci-
gle fication

6.9 Adjusting valve seat

NOTE
• Before you adjust the valve seat, check the
valve stem and measure the I.D. of the valve
guide section.
Repair them if necessary.
• After you adjust the valve seat, be sure to check
the valve recessing.
Tools required
• Valve seat cutter
• Valve lapping tool.
• Prussian Blue
1. Slightly adjust the seat surface with a 1.0 rad (60°)
or 0.79 rad (45°) valve seat cutter.
Valve seat an- Service speci-
gle fication
4-54
1.0 rad
Intake valve
60°
0.79 rad
Exhaust valve
45°
1.0 rad
Intake valve
60°
0.79 rad
Exhaust valve
45°
(a) 0.26 rad (15°) or 0.52 rad
(30°)
2. Adjust the seat width with a 0.52 rad (30°) or
0.26 rad (15°) valve seat cutter.
3. After you adjust the seat, check that the valve
seating is flat.
4. Apply a thin layer of compound between the valve
face and valve seat, and lap them with a valve
lapping tool.
5. Check the valve seating with Prussian Blue.
NOTE
• The valve seating surface must show good
contact on all sides.
Valve seat width Service specifica-
(1) tion
(1) Valve seat width
(2) Identical dimensions
(A) Check the contact
(B) Correct seat width
RELATED PAGE
6.4 Checking valve recessing on page 4-51
6.6 Checking clearance between valve stem and
valve guide on page 4-52
SERVICING
6. Servicing
(b) 0.79 rad (45°) or 1.0 rad
(60°)
2.12 mm
0.0835 in.
(C) Check the contact
(c) 0.52 rad (30°) or 0.26 rad
(15°)
05-E4B SERIES,05-E4BG SERIES
KiSC issued 03, 2023 A