(d) Remove water pump line and pump line gasket.
(e) Remove thermostat housing and gasket.
(f) Remove thermostat. Do not disassemble
further unless base gasket must be replaced.
(3) Testing. Test the thermostat for proper operation
by suspending it and a thermometer in a container of
water. Heat the water. When the thermometer indicates
between 160 and 165 degrees Fahrenheit, the thermostat
should begin to open. It should be fully open when the
temperature has risen to between 185 and 190 degrees
Fahrenheit. Remove the thermostat from the water when
it is fully open. The cool surrounding air should now
cause the thermostat to dose rapidly. Replace a defective
(4) Repair. No repair of a faulty thermostat is
possible. It must be replaced. Replace all gaskets when
disassembly has occurred. Replace faulty hoses or hose
thermostat housing, and lines.
d. Water Pump. Drain the coolant system be- low
the level of the water pump before removing the pump.
figure 3-51 and loosen the alternator V-belt until the belts
Figure 3-34. Engine speed governor, removal and
can be removed from the water pump sheaves. Refer to
figure 3-49 and remove the water pump and drive sheave.
clean with a damp cloth. Keep the petcock (fig.
e. Water Pump Drive Belt. The water pump drive
(2) Removal. With the engine stopped, open
information on water pump drive belt adjustment or
remove the upper connection hose attached to the top
of the thermostat housing. Then proceed as follows:
and replace a faulty water temperature sender.
3-49. Electrical System
a. General. This machine uses 24 volt compon-
Note that the Oildex filter will be removed from its
ents. Refer to figure 1-14 for a view of the electrical
mounting on the thermostat housing by removing
system schematic diagram. The system consists of two
12 volt batteries, a magnetic switch, an alternator with
internal voltage regulator, the starter motor, and other
(b) Remove the clamp which secure the
minor components as shown on the schematic diagram.
water pump line to the thermostat housing.
The system is of the negative ground type.