Checking Opening Temperature Of Thermostat Valve; Checking Injection Timing - Kubota WSM 05-E4B Series Workshop Manual

SERVICING
4. Checking and adjusting
Thus, refer to the test pressure of each radiator
specification to do the leakage test.
Tools required
• Radiator tester and an adapter
1. Fill a specified quantity of water into the radiator.
2. Set a radiator tester and an adapter on the radiator.
3. Increase the water pressure to the specified
pressure with the radiator tester and an adapter.
4. Check the radiator for water leakage.
Radiator water Service specifi-
leakage test cation
NOTE
• For water leakages from the pinhole, replace
the radiator or repair with the radiator
cement.
• When water leak is too much, replace the
radiator.
4.8 Checking opening temperature of
thermostat valve
Tools required
• Thermometer
1. Push down the thermostat valve and put the thread
between the valve and the valve seat.
2. Put the thermostat and the thermometer in the
container and increase the temperature of the water
gradually.
3. Take the thread, and float the thermostat in the
water.
4. As the coolant temperature rises, the valve will
open, and the thermostat will separate from the
thread.
5. Measure the temperature at this moment.
Thermostat valve
Service specifica-
opening tempera-
tion
ture
05-E4B SERIES,05-E4BG SERIES
No leak at specified pres-
sure
69.5 to 72.5 ℃
157.1 to 162.5 ℉
6. Continue to increase the temperature and read the
temperature when the valve full opens gap.
Valve full opens gap
Full opening tem- Service specifica-
perature tion
NOTE
• If the measurement is out of the service
specifications, replace the thermostat.

4.9 Checking injection timing

1. Remove the injection pipes.
2. Turn the flywheel counterclockwise (viewed from
flywheel side), until the fuel fills up to the hole of the
delivery valve holder (1) of No. 1 cylinder.
(1) Delivery valve holder
3. After the fuel fills up to the hole of the delivery valve
holder (1) of No. 1 cylinder, turn back (clockwise)
the flywheel around 1.6 rad (90°).
4. Turn the flywheel counterclockwise to set at around
0.44 rad (25°) before T.D.C..
5. Slowly turn the flywheel counterclockwise and stop
turning, when the fuel begins to come up to get
present injection timing.
4. ENGINE
Approx. 8 mm
Approx. 0.3 in.
85 ℃
185 ℉
4-21
KiSC issued 03, 2023 A