Toro Workman 3000 Series, Service Manual

Page: 183 / 306

High Temperature Shutdown Switch (Briggs/Daihatsu Gas and Diesel Engine)
The high temperature shutdown switch is threaded into
i
tached to the switch.
CAUTION
Make sure engine is cool before removing the
temperature shutdown switch.
1
2
the thermostat housing (Fig. 15). There s a blue wire at-
Testing
temperature switch.
1. Lower coolant level in the engine and remove the
2. Put switch in a container of oil with a thermometer
Figure 15
and slowly heat the oil (Fig. 16).
1. Temp. shutdown switch 2. Thermostat housing
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
VOA
3. Check continuity of the switch with a multimeter
(ohms setting). The temperature switch is normally open
and should close at approximately 238
o
F (114
o
C).
Figure 16
4. Allow oil to cool while observing temperature. The
temperature switch should open at about 232
o
F (111
o
C).
5. Replace switch if necessary.
6. Install switch to the water pump.
A. Clean threads of water pump housing and switch
thoroughly. Apply thread sealant to the threads of the
switch.
B. Screw switch into the water pump housing and
tighten.
C. Connect blue wire to switch.
7. Fill engine cooling system (see Operator’s Manual).
Workman 3000/4000 Series Page 8 – 13 Electrical System
Electrical
System