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Reelmaster 3100−D Page 5 − 33 Electrical Systems (Rev. C)
High Temperature Warning and Shutdown Switches
The high temperature warning and shut down switches
are located on the water pump, which is located on the
rear end of the engine block. The high temperature shut-
down switch is on the alternator side of the engine (Fig.
11).
CAUTION
Make sure engine is cool before removing the
temperature switch.
1. Lower coolant level in the engine and remove the
temperature switch.
2. Put switch in a container of oil with a thermometer
and slowly heat the oil (Fig. 12).
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
Note: On units with serial numbers from 90101 to
90150, the high temperature shutdown switch settings
are the same as the high temperature warning switch
below.
3. Check continuity of the switch with a multimeter
(ohms setting).
A. The high temperature warning switch is normally
open and should close between 216 to 226
o
F (102 to
108
o
C).
B. The high temperature shutdown switch is normal-
ly open and should close between 225 to 235
o
F (107
to 113
o
C).
1. Temp. warning switch
2. Temp. shutdown switch
3. Water pump
Figure 11
1
2
3
Figure 12
4. Allow oil to cool while observing temperature.
A. The high temperature warning switch should
open at about 208
o
F (98
o
C).
B. The high temperature shutdown switch should
open at about 219
o
F (104
o
C).
5. Replace switch if necessary.
Electrical
System