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Overheating
Overheating
If the fan drive operates below its minimum design
If the fan drive operates below its minimum design
speed, engine overheating may result at low car speeds.
speed, engine overheating may result at low car speeds.
Check as follows:
Check as follows:
(1) Cooling system must be at room temperature
(1) Cooling system must be at room temperature
for test.
for test.
(2) ) Mark fan blade with white or yellow chalk or
(2
Mark fan blade with white or yellow chalk or
crayon.
crayon.
(3) Attach timing light to engine, set engine speed
(3) Attach timing light to engine, set engine speed
to about 1700 rpm, and then adjust engine speed until
to about 1700 rpm, and then adjust engine speed until
fan blade mark is stopped by timing light.
fan blade mark is stopped by timing light.
(4) The drive should be replaced if the engine
(4) The drive should be replaced if the engine
speed at which the fan is stopped is below 1550 rpm.
speed at which the fan is stopped is below 1550 rpm.
Exce
Excess
ssive
ive F F an
an Noise
Noise
If the fan drive fails to properly limit the top fan
If the fan drive fails to properly limit the top fan
speed, excessive fan noise may result. Check as fol-
speed, excessive fan noise may result. Check as fol-
lows :
lows :
( 1) Check engine speed at which timing light stops
( 1) Check engine speed at which timing light stops
the fan as in "Overheating" above.
the fan as in "Overheating" above.
(2) The drive should be replaced if the engine speed
(2) The drive should be replaced if the engine speed
at which the fan is stopped is above 1800 rpm.
at which the fan is stopped is above 1800 rpm.
3. THERMOSTAT
3. THERMOSTAT
The thermost
The
thermost at at is is actuated
copper-impregnated wax. As the temperature of the
copper-impregnated wax. As the temperature of the
pellet increases, the wax expands and opens the valve.
pellet increases, the wax expands and opens the valve.
A 180' thermostat is standard equipment. With this
A 180' thermostat is standard equipment. With this
thermostat, ethylene glycol base permanent type anti-
thermostat, ethylene glycol base permanent type anti-
freeze must be used. If an alcohol type anti-freeze is
freeze must be used. If an alcohol type anti-freeze is
desired, a 160" thermostat must be installed.
desired, a 160" thermostat must be installed.
If the thermostat does not close completely when
If the thermostat does not close completely when
cold, the engine will warm up slowly and heater per-
cold, the engine will warm up slowly and heater per-
formance may be inadequate. Poor heater performance
formance may be inadequate. Poor heater performance
may also be due to the valve opening at too low a
may also be due to the valve opening at too low a
temperature. Too high a valve opening temperature or
temperature. Too high a valve opening temperature or
a valve that will not open can cause overheating.
a valve that will not open can cause overheating.
Thermostat Removal
Thermostat Removal
( 1) Drain the cooling system down to thermostat
( 1) Drain the cooling system down to thermostat
level or below.
level or below.
(2) Remove the upper hose from the thermostat
(2) Remove the upper hose from the thermostat
housing using pliers C-3250.
housing using pliers C-3250.
(3) Remove thermostat housing bolts and remove
(3) Remove thermostat housing bolts and remove
thermostat and housing.
thermostat and housing.
Thermostat Testing
Thermostat Testing
(1) Visually inspect thermostat to make sure valve
(1) Visually inspect thermostat to make sure valve
closes tightly. If valve does not close completely due
closes tightly. If valve does not close completely due
to dirt, sand, or other foreign material, clean valve and
to dirt, sand,
or other foreign material, clean valve and
seat. If valve does not close tightly when clean, install
seat. If valve does not close tightly when clean, install
a new thermostat.
a new thermostat.
' ' r r - -
; ;
tightened to the specified tension (see Specifications)
tightened to the specified tension (see Specifications)
actuated by
by a a pellet
pellet contain
containing
wide strip of .003"
wide strip of
.003" feeler stock into the opening and
allow the valve to close. If the feeler stock will not
allow the valve to close. If the feeler stock will not
hold in place, discard the thermostat.
hold in place, discard the thermostat.
(3) Suspend the thermostat, by the feeler stock
(3) Suspend the thermostat, by the feeler stock
strip, in a container of water. Make sure the thermo-
strip, in a container of water. Make sure the thermo-
stat does not touch the sides or bottom of container.
stat does not touch the sides or bottom of container.
(4) Heat the water (stir the water continuously to
(4) Heat the water (stir the water continuously to
insure uniform temperature) and check the water
insure uniform temperature) and check the water
temperature at which the thermostat falls off the feeler
temperature at which the thermostat falls off the feeler
strip. Do not touch the sides or bottom of the container
strip. Do not touch the sides or bottom of the container
with the thermometer. The thermostat should drop off
with the thermometer. The thermostat should drop off
at a water temperature of from 175" to 185". If it is
at a water temperature of from 175" to 185". If it is
outside of this range discard it.
outside of this range discard it.
(5) The thermostat valve should be wide open (ap-
(5) The thermostat valve should be wide open (ap-
proxim
pro
ximate
ately 45
ly 45" " angl
from 195" to 205". Discard the thermostat if it is not
from 195" to 205". Discard the thermostat if it is not
within this range.
within this range.
Thermostat
Thermostat
Installation
Installation
( 1) Using a new gasket, position the thermostat so
( 1) Using a new gasket, position the thermostat so
that the pellet end is toward the engine and attach with
that the pellet end is toward the engine and attach with
bolts through the thermostat housing.
bolts through the thermostat housing.
(2) Fill the cooling system to 1 1
(2) Fill the cooling system to
neck with water and rust resistor or water and anti-
neck with water and rust resistor or water and anti-
freeze.
freeze.
ing a a
4. PROPER BELT TENSION
4. PROPER BELT TENSION
The
The satisfactor
satisfactory y performan
cessories depends on the maintenance of the proper
cessories depends on the maintenance of the proper
belt tension. If the specified tensions are not main-
belt tension. If the specified tensions are not main-
tained, belt slippage may cause engine overheating,
tained, belt slippage may cause engine overheating,
lack of power steering assist, loss in air conditioning
lack of power steering assist, loss in air conditioning
capacity, reduced alternator charging rates, and great-
capacity, reduced alternator charging rates, and great-
ly reduced belt life. To avoid any such adverse ef-
ly reduced belt life. To avoid any such adverse ef-
fects, the following service procedure should be fol-
fects, the following service procedure should be fol-
lowed
lowed
(1) Retighten all belts to the specified
(1) Retighten all belts to the specified
tension at new car preparation. See Belt Tension Speci-
tension at new car preparation. See Belt Tension Speci-
fications.
fications.
(2) Retighten all belts at the 2,000 mile check-up.
(2) Retighten all belts at the 2,000 mile check-up.
(3) Check all belts by the torque or deflection
(3) Check all belts by the torque or deflection
method at servicing and retighten if needed.
method at servicing and retighten if needed.
(4) The new belt tension specifications should be
(4) The new belt tension specifications should be
used on all belt replacements.
used on all belt replacements.
NOTE: Any belt that has operated for a
NOTE: Any belt that has operated for a
minimum of a half-hour is considered to be
minimum of a half-hour is considered to be
used.
used.
There are
There
are two
two methods
be properly established.
be properly established.
5. TORQUE METHOD
5. TORQUE METHOD
All alternator and power steering pump belts can be
All alternator and power steering pump belts can be
C C O O O O L L ING
ING S S YS
YS T T EM
EM
Other belts can also be tightened by this method if
Other belts can also be tightened by this method if
feeler stock into the opening and
angle) at a wate
e) at a water tempe
r temperatur
inches below filler
inches below filler
performance
ce of of the
the belt
belt driven
methods by
by which
which belt
belt tensions
tensions can
rature of
e of
driven ac-
ac-
used
used
belt
belt
can
. .
2 2 3 3
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