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ENGINE
COOLING SYSTEM
2-45
1ST LOOSEN LOWER AND UPPER
GENERATOR CLAMP BOLTS
SHOWN AT "A"
"B"
AND "C"
A SLIGHT AMOUNT
2ND ADJUST FAN BELT TENSION
TO
y,
INCH AS SHOWN
TIGHTEN LOWER CLAMP BOLT
"B" AND RECHECK TENSION
TIGHTEN CLAMP BOLTS "A"
FRONT AND REAR AND
"C"
Figure 2-41 -Fun Belt Adjustment
2-41 so that generator can be moved in toward
the cylinder block to provide maximum slack.
The new or old belt must be adjusted so that
it will deflect approximately
%"
with a normal
thumb pressure applied midway between the
generator and fan pulleys. The steps for ad-
justment are shown in figure 2-41.
2-28 RADIATOR THERMOSTAT
INSPECTION AND TEST
A sticking radiator thermostat will prevent
the cooling system from functioning properly.
If
the thermostat sticks in the open position,
the engine will warm up very slowly.
If
the
thermostat sticks in the closed position, over-
heating will result.
The thermostat may be removed for inspec-
tion and test by partially draining the cooling
system and disconnecting the cylinder outlet
from the thermostat housing.
When the thermostat is cold, the valve should
be fully seated.
If
valve does not seat, or the
bellows portion is distorted or damaged, the
thermostat should be replaced.
If
thermostat valve seats when cold, test the
thermostat for correct opening temperature by
immersing the unit and a thermometer in a
container of water over a heater. While heat-
ing the water do not rest either the thermometer
or thermostat on bottom of container as this
will cause them to be at higher temperature
than the water. Agitate the water to insure uni-
form temperature of water, thermostat and
thermometer.
The standard thermostat (151°) valve should
start to leave its seat at a temperature of
148° F. to 155° F., and should be fully open at
a temperature not in excess of 175° F. On the
high temperature (182°) thermostat which
may be installed to improve car heater per-
formance, the valve should start to leave its
seat at a temperature of 178° F. to 185
0
F.,
and should be fully open at a temperature not
in excess of 211
0
F.
If
thermostat does not
operate at specified temperatures it should be
replaced as it cannot be adjusted.
2-29 WATER PUMP SEAL
REPLACEMENT
Since the first type water pump (fig. 2-18)
can be replaced by the second type pump (fig.
2-19) at very little increase in cost over re-
pairs, and thus gain the advantage of the im-
proved seal design of the second type pump,
replacement parts are not furnished for the
first type pump. The procedure given here ap-
plies to the second type water pump only.
When installed in engine, the first and sec-
ond type water pumps may be identified by the
pump body casting number which is located on
front face of body on the left side. The body
casting number for the first type pump is
1330139, and the casting number for the second
type pump is 1336756.
a. Removal and Disassembly of
Water Pump
1. Drain cooling system, being sure to drain
into a clean container if anti-freeze solution is
to be saved.
2. Remove fan belt and disconnect radiator
and heater hoses from water pump.
3. Remove water pump and also remove
pump body to thermostat housing rubber hose
if it is in doubtful condition.
4. Remove fan blade and pulley from hub on
water pump shaft.
5. Remove water pump cover and remove
impeller from pump shaft, using a suitable
puller. A puller with two hooks is preferred,
however, a puller with three hooks may be used.
See figure
2-42.
6. Remove carbon washer, spring and bel-
lows from the brass sleeve that is pressed into
pump housing.
It
is not necessary to remove
the brass sleeve if it is in good condition.
If
sleeve is doubtful, however, remove it by driv-
ing a sharp punch through the bottom and pry-
ing sleeve out.
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