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57 COOLING SYSTEM
FIGURE 2
FAN BELT ADJUSTMENT
1. Loosen generator adjusting bracket bolt (A)
Figure 2 nut (B) and two generator support
bracket bolts (D) three t o four turns.
2. Apply a torque wrench approximately 12"
long and as nearly vertical as possible to the
head of generator adjusting bracket bolt (C)
and pull generator against fan belt.
3. With torque wrench indicating 10-1/2 foot
pounds tighten generator adjusting nut (B)
securely. Remove torque wrench and tighten
remaining three bolts securely.
THERMOSTATS
The temperature at which the thermostat
opens is very important and it should be
checked whenever the complete cooling system
is being checked.
CAUTION: In cases of extreme overheating
or freezing, check the thermostat, as exces-
sive temperature may have caused the bel-
lows to take a set in the expanded position.
FIGURE 3
Place the thermostat in a pail of water with a ther-
mometer and heat the water until the thermostat starts
to open.
The thermometer should show from 150° to 155°
F, Figure 6.
Continue he a tin g the water until the thermostat is
wide open. The thermometer should show 175° F.
Discard thermostats that:
Do not open completely.
Open at too low a temperature.
Open at too high a temperature.
A thermostat that opens too soon will cause the
engine to operate at too low a temperature and if it
opens too late or is sticking, it may cause the engine
to overheat.
NOTE: High temperature thermostats are also
available, these start to open at 165° to 170° F.
These should be used with permanent type Anti-
Freeze to insure maximum heater efficiency.
WATER TEMPERATURE GAUGE
When the coolant is cold, the high resistance in the
unit causes the instrument panel gauge to read at the
cold end of the dial with ignition switch turned on,
Figure 4.
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