ENGINE COOLING
AND
LUBRICATION
6A-3
3.
Tighten all
hose
connections on radiator, en-
gine, heater and defroster. Replace any deteriorated
hose.
Check
to see that radiator hold-down bolts are
tightened properly.
4.
Fill
system with water and operate engine,
checking
for water leaks at radiator core,
hose
connections, water pump seal and gaskets, heater
and
defroster connections, and head to block joint.
5.
Drain
sufficient water to allow addition of prop-
er
quantity of coolant.
Do not overfill. Coolant should be 1" below filler
neck
opening with hot engine, 3" below filler neck
with
cold engine for all models.
CAUTION:
A
pressure
radiator
cap is
used
to
provide
the
best
cooling.
When
removing,
rotate
cap
to
left
very
slowly.
If
hissing
noise
is
heard,
stop
and
allow
pressure
to
decrease
before
re-
moving
cap
completely.
To
assure most effective heater performance, all
models are equipped with a
190°F.
thermostat.
Therefore,
the use of Pontiac-approved inhibited
glycol-type engine coolant
gives
best heater
performance.
Non-glycol base coolant should not be used.
INHIBITORS
When
only water is in the system, a cooling system
corrosion
inhibitor must be used.
TESTING
COOLANT
In
using a hydrometer to determine the freezing
point of radiator solution, make sure correct hy-
drometer markings are
read.
Unless hydrometer is
provided
with means for temperature correction,
test
should be made at temperature at which hydrom-
eter is calibrated, for if the solution is warmer or
colder large errors may result (in
some
cases as
much
as
30°F.)
Most
good
hydrometers are equipped
with
a thermometer and temperature correction
scale which allows an accurate
test
of freezing point
over a range of temperatures.
THERMOSTAT-REMOVE
AND
REPLACE
1.
Drain
radiator level to below thermostat and
remove water outlet assembly from rocker arm
cover (6
cyl.),
intake manifold (8
cyl.).
2.
Remove thermostat. Unless obviously defective,
test
thermostat as follows before replacing with new
one:
a.
Immerse unit and thermometer in container
of water over a heater. While heating water do not
rest
either thermometer or thermostat on bottom
of container as this
will
cause them to be at higher
temperature than the water.
b.
Agitate water to insure uniform temperature
of water, thermostat and thermometer.
A
new thermostat
(190°)
valve should start to
open (
o
002
M
) at a temperature of
187°F.
to
193°F.,
and
should be fully open (3/8") or more at a tem-
perature
not in
excess
of
222°F.
A used thermostat
can
be about 7°F. above or below this setting
(183°
-
197°F.)
without adverse
effect
and should not
be replaced. If thermostat
does
not operate at
specified temperatures, it should be replaced as
it
cannot be adjusted.
3.
Install
thermostat with pellet or cartridge pro-
jecting
down into water passage.
4. Using new gasket, install water outlet fitting.
Tighten
bolts to 21 lb. ft. (6
cyl.),
28 lb. ft. (8
cyl.).
5.
Refill
radiator to approximately 3
,T
below filler
neck
for all models.
WATER
PUMP—8
CYLINDER
NOTE:
Wa ter pump is
serviced
only
as an
assembly.
1.
Drain
radiator.
2.
Loosen generator at adjusting strap and remove
fan
belt from fan pulley.
3.
Remove fan and pulley.
4. Remove water pump retaining bolts and remove
pump.
5.
Install
pump by reversing above steps. Tighten
water
pump attaching bolts to 15 lb. ft. torque. Ad-
just
belt for proper tension on chart at end of
this section.
WATER
PUMP—6
CYLINDER
REMOVE
1.
Drain
cooling system and remove water inlet
and
heater hoses.
2.
Remove all fan and accessory drive belts.
3.
Remove fan and pump pulley.
4. Remove upper front timing belt cover.
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