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13-4
ENGINE COOLING
than 3
pressure
pounds per square inch below original
9. If pressure is below these specifications, in
spect radiator cap gasket for obvious causes of
leakage, such as cracks and cuts. Examine radia
tor cap gasket seat within filler neck for dents
or surface imperfections. If this
surface is bent
or badly dented, filler neck must be replaced.
10. If filler
neck seat is only scratched or
pitted, it may be resurfaced
with a tool made
for this purpose, as shown in Fig.
CAUTION:
Remove only a small amount of
material
from the seat. Excessive refinishing
will ruin filler neck.
11. Repeat pressure test after refinishing.
8
Removal of Thermostat
1. Drain radiator partially.
2. Remove upper radiator hose.
3. Remove four cap screws from thermostat
housing at top of water pump body and remove
housing and gasket.
4. Remove thermostat from top of water pump
body.
9
Radiator Thermostat Tests
A radiator thermostat may be checked by plac
ing it, with the thermostat heat control unit down
on a brick in a pan of water also containing a
thermometer.
Neither
the thermostat
nor the
thermometer should rest on the bottom of the pan,
because of the uneven concentration of heat at the
point where the pan is heated.
To test a standard
thermostat,
the water in
continuously as the temperature approaches 155°F.
The thermostat valve sl,ould start 0to open at a
temperature between 163 F and 1680F. When the
water reaches a temperature of 188 F, the valve
should be fully open.
High
temgerature
shermostats should start to
open aj 177 F to 182 F and should be fully open
at 202 F.
10
Installation of Thermostat
1. Install thermostat in opening at top of water
pump with valve up.
NOTE:
Be sure that the thermostatic spring
strap is parallel to the centerline of the car
fore and aft. This will reduce the possibility
of the right hand bank running at a higher tem
perature than the left hand bank.
2. Install a new thermostat gasket, coated with
gasket cement, on water pump housing.
3. Install thermostat housing on water pump body
and install cap screws, tightening them to 13 ft. lbs.
torque.
4. Install upper radiator hose on radiator and
pump housing.
5. Fill cooling system.
11
Flushing Cooling System
1. Remove generator drive belt and water pump,
See Note 18.
2. Install reverse
flushing apparatus in right
cylinder head outlet hole.
3. Turn on full flow of water.
4. Remove
second,
third, sixth, and seventh
cylinder head bolts from the lower row, next to
the exhaust manifolds, one at a time and insert
Cylinder Block Air Gun, Tool No.J-1543, Fig. 13-4.
Blow air into each hole several times.
5. Duplicate this operation on left cylinder block.
6. Shut off flow of water and examine water
passage with a flashlight. If they are still dirty,
repeat the flushing operation.
7. Reverse flush radiator with radiator cap and
hoses removed.
Fig. 13-3 Filler Neck Refinishing Tool
the pan should be heated and should be stirred
8. Install water pump using new gaskets.
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