Adjusting Valve Angle; Adjusting Valve Seat - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE
Tools required
• Press tool
• Valve guide replacing tool
Removing valve guide
1. Press out the used valve guide with the valve guide
replacing tool.
(A) Removing direction
Installing valve guide
1. Clean the new valve guide and valve guide bore,
and apply engine oil to them.
2. Press fit the new valve guide with the valve guide
replacing tool.
(B) Installing direction
3. Ream accurately the I.D. of the valve guide to the
specified dimension.
Service specifi-
Valve guide I.D.
cation

7.8 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.
4-166
8.015 to 8.030 mm
0.3156 to 0.3161 in.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
Tools required
• Valve refacer
1. Adjust the valve with a valve refacer.
Service specifi-
Valve face angle
cation

7.9 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.
Service specifi-
Valve seat angle
cation
(a) 0.26 rad (15°) or 0.52 rad
(30°)
SERVICING
7. Servicing
0.79 rad
45°
0.79 rad
45°
(b) 0.79 rad (45°) or 1.0 rad
(60°)
KiSC issued 12, 2018 A