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11-4
GROUP 11-
COOLING SYSTEM
EJ
COMMON ADJUSTMENTS AND REPAIRS
ADJUSTMENTS
DRIVE BELTS
The fan drive belt(s) should be
properly adjusted at all times. A
loose drive belt(s) causes improper
alternator, fan and water pump
operation.
A belt(s) that is too tight
places a severe strain on the water
pump and the alternator
bearings.
Properly
tensioned
drive
belts
minimize noise and also prolong
service life of the belt.
Therefore,
it
is recommended that a belt tension
gauge be used to check and adjust
the belt
tension.
Any belt that has
operated for a minimum of 10 min-
utes is considered a used belt, and
when adjusted, it must
be
adjusted to
the reset tension shown in the sped-
cations.
Belt Tension
1.
Install the belt tension tool on
the drive belt
(Fig.
2)
and check
the tension following the instructions
of the tool
manufacturer.
Tooi-T63L·8620·A
FIG. 2-Checking Drive Belt
Tension
2. If adjustment is necessary
loosen alternator mounting and ad-
justing arm bolts. Move alternator
away from engine until
correct
tension is
obtained.
Tighten alter-
nator adjusting arm and mounting
bolts.
FAN REPLACEMENT
ALL MODELS
TO REMOVE
1.
Loosen the fan belt.
2. If a fan
sl·.;o ud
is fitted remove
it from the radiator and lay it back
against the engine.
3. Remove capscrews and lock
washers retaining fan and spacer to
the water pump hub
.
Remove the fan
and
spacer.
TO INSTALL
1 . Position the fan and spacer on
the water pump hub and install
the lock washers and capscrews.
2. Torque the capscrews evenly
and alternately to
specifications.
3. Refit
the
fan
shroud
if
applicable
.
4.
Adjust
the
fan
belt
to
specification.
FAN DRIVE BELT
REPLACEMENT
1. On a car with power steering,
loosen power steering pump bracket
at water pump. Remove drive belt.
2. Loosen alternator mounting and
adjusting arm bolts. Move alternator
toward
engine.
Remove the belt(s)
from alternator and crankcase pulleys,
and lift them over fan.
3. Place the belt(s) over the fan.
Insert the belt(s) in the water pump
pulley, crankshaft pulley and alter-
nator pulley grooves. Adjust the belt
tension to specifications.
4.
On a car with power steering,
install the power steering pump drive
belt and tighten the pump bracket to
the water pump. Adjust the drive
belt tension to specifications.
RADIATOR HOSE
REPLACEMENT
Radiator hoses should be replaced
whenever
they
become
cracked,
rotted or have a tendency to collapse.
1. Drain radiator; then loosen the
clamps at each end of hose to be
removed
.
Slide hose off radiator con-
nection and the cylinder head water
outlet or water pump connection.
2. Position the clamps at least
t
"
from each end of hose. Slide hose
on the connections. Make sure the
clam?S are beyond bead and
placed in the centre of clamping
surface of connections. Tighten
clamps. Fill radiator with
coolant.
Operate engine for several minutes;
then check the hoses and connections
for leaks. Check for proper coolant
level after the engine has reached
normal operating temperature.
THERMOSTAT REPLACEMENT
A
poppet-type
thermostat
is
mounted in a recess in the coolant
outlet passage at the front of the in-
take manifold on the
V-8
engines.
On 6-cylinder
engines,
the thermo-
stat is located in the coolant
outlet
passage at the front of the cylinder
head. When the thermostat is closed,
coolant flows to the water pump
through a bypass passage at the
front of the
engine.
When the ther-
mostat is open, coolant flows through
the coolant outlet elbow (thermo-
stat housing) to the radiator.
The thermostat used in production
is for use with water or permanent-
type anti-freeze. For operating tem-
peratures, refer to specifications.
Check the thermostat before in-
slalling it following the procedure
under "Thermostat
Test",
Page
11-3.
Do not attempt to repair the
thermostat.
It
should
be
replaced if
it
is not operating properly.
Removal
1. Drain cooling system below level
of the coolant outlet housing.
2. Remove coolant outlet housing
retaining bolts and slide housing
(with hose attached) to one
side.
3. Remove thermostat and gasket.
Installation
1. Clean coolant outlet housing and
cylinder head surface. Coat a new
coolant outlet housing gasket with
sealer. Position gasket on cylinder
head or intake manifold (V -8).
The gasket must be positioned on
cylinder head or intake manifold
before thermostat is installed.
2. Coat edge of thermostat with
grease for thermostat adhesion. Pos-
ition thermostat in recess of coolant
outlet housing so that copper pellet
or heat element will be in the cylinder
head or intake manifold (V-8).
Install thermostat with the word
TOP toward the top of the engine
and valve end of thermostat facing
outward. If thermostat is impro-
perly positioned, it
will cause the
engine to overheat.
3. Fill radiator. Operate engine and
check for coolant leaks and proper
coolant level after engine reaches
normal operating temperature.
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