Kubota D1803-CR-E4, Workshop Manual

Page: 198 / 309

4. Checking and adjusting
4.1 Checking compression pressure
of cylinder
NOTE
• Check the compression pressure with the
specified valve clearance.
• Always use a fully charged battery for you do
this test.
• Variances in cylinder compression values must
be less than 10%.
Tools required
• Compression tester
• Injector adapter
1. Warm-up the engine.
2. Remove the air cleaner and muffler.
3. Remove the glow lead and glow plugs.
4. Disconnect the injector connectors.
5. Set a compression tester (1) with the compression
tester adapter (2) to the glow plug hole.
(1) Compression tester (2) Compression tester adaptor
6. Crank the engine with the starter to operate the
engine approx. 200 to 300 min
-1
(rpm).
7. Measure a maximum value of the compression
pressure.
Compression pres-
sure
Service specifi-
cation
2.95 to 3.23 MPa
30.1 to 32.9 kgf/cm
2
428 to 468 psi
Service limit
2.35 MPa
24.0 kgf/cm
2
341 psi
8. Do the same steps twice for each cylinder.
9. Install the removed parts.
Tightening tor-
que
Glow plug
14.7 to 19.6 N
⋅
m
1.50 to 1.99 kgf
⋅
m
10.9 to 14.4 lbf ⋅ ft
Glow lead mount-
ing nut
0.980 to 1.77 N ⋅ m
0.100 to 0.180 kgf
⋅
m
0.723 to 1.30 lbf ⋅ ft
4.2 Adjusting valve clearance
IMPORTANT
• You must check and adjust the valve clearance
when the engine is cold.
Tools required
• Feeler gauge
1. Remove the air cleaner and muffler.
2. Remove the cylinder head cover.
3. Align the
[1TC] mark (2) line on the flywheel and
projection on the housing.
(1) Align mark (2) [1TC] mark
4. Make sure that the No. 1 piston comes to the
compression or overlap top dead center.
4. ENGINE
SERVICING
4. Checking and adjusting
4-98
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A