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 CHECK FOR:
1.
Low coolant level.
2.
Broken or loose fan belt.
3.
Defective radiator cap.
4.
Broken or leaking hoses.
5.
Inacurrate temperature sensing
unit.
6.
Radiator core fins block by
debris.
7.
Stuck or broken thermostat.
8.
Sludged radiator core.
9.
W o r n water pump.
10.
Transmission problems.
If all the above are checked out as not
the cause of overheating the engine,
Figure 4-17.
Thermostat
Test
then follow these steps for checking
the viscous fan.
f.
If thermostat starts to open
before 175 F. or doesn't open until
a.
The engine should be relatively
185 F., it is defective and must be
cold (turned off for at least four hours.)
replaced.
thermostat should be fully
o p e n a t 2 0 2 F.
b.
Start engine and set throttle at
about 2000 RPM minimum.
This should be
Using gasket sealer on both
done in a warm area.
g.
sides, affix both water outlet elbow
gaskets to water outlet elbow flanges.
C.
It should be noted that the fan
speed may be high upon initial engine
NOTE
start, but will reduce in speed within
a few minutes time.
Scrape or otherwise remove all residue
of old gaskets and sealer before in-
d.
Within ten minutes there should
stalling new gaskets.
be enough heat generated (180 degrees
F. air temp at bi-metal coil) to cause
h.
Position thermostat in bore of
the fan speed to increase.
water pump flange, and install water
outlet elbow, securing with cap-
e.
To make specific measurements
screws previously removed.
of coil air temperature and fan speed,
requires some reliable equipment. It
1.
Torque attaching screws at
i s p o s s i b l e , with experience, to make
water pump and cylinder head flanges
a judgment in this area without measur-
to 20 ft./lbs. torque.
ing equipment.
Whenever a mal-
VISCOUS FAN:
4-15.
f.
If it is obvious that the
function of the viscous, fan is sus-
viscous fan clutch did engage and
pected, always make sure all other
increase the fan speed, then the
parts of the cooling system are in
clutch can be considered to be
good working order first.
operating satisfactorily.
4-19
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