0500-54
\VILLYS MODEL "MB" %-TON
4
r
4
GOVERNMENT TRUCK
head. The tliermostat opening is set by tlie
manulacturer and cannot be
altered. Tlie tlierm-
ostat opens at a temperature of
145'
to
155'
Falir. l'o test thermostat, heat suficient water to
170'
Fahr. and submerge tliermostat. The valve
should open to the liniit at this temperature.
If
valve fails to open. a iiew thermostat will be re-
quired.
Heat Indicator
The heat indicator
is
of the Bourdon type and is
connected to a bulb in the engine block by means
of a capillary tube.
If tlie unit becomes inoperative,
it
should be re-
placed as it is not
practica1 to either repair or ad-
just this unit.
Water Pump
The water pump, Fig.
1
is a centrifugal impeller
type of large
capacity to circulate tlie water in
the
entire cooling system.
The double row
bal1 bearing is integral with the
shaft, No.
2,
Fig.
2
and is packed with
a
special
high melting
point grease at tlie time of manufactiire
M,
it
requires no lubrication. The ends of the bar-
ing~ are
sealed to retain the lubricant and prevent
dust and dirt from entering.
The baring is retained in the housing
by a
retaining wire No.
4,
wliich snaps between the
bearing and tlie water pump body. The
seal
washer
No.
5
has four lugs wliich
fit
into the slots in the
end of the impeller No.
8.
One side of the seal
washer bears against the ground surface of the
pump
housiiig and the other against the seal No.
7.
Tlie rubber seal bears against the machined surface
on the inskie of the impeller. The seal maintains a
constant
pressure against the seal washer and
impeller
assuring pocitive seal. The drain hole in
the bottom
of housing prevents any water seepage
past the seal
washer No.
5
entering the bearing.
The impeller and fan pulley are
pressed on to
the straight shaft under
2500
pounds pressure.
Dismantling of Water Pump
Remove fan belt and fan assembly and then
tlie water pump from the engine.
.Remove bearing retaining wire No.
4,
Fig.
2.
Place water pump body on arbor press face plate
and
press water pump shaft tlirougli impeller No.
8.
and pump body No.
3.
Kemove the seal washer No.
5
and seal No.
7.
Place pump sliaft No.
2
and fan pqlley No.
1
on
press so that tlie bearing wil1 clear in the opening
and
press sliaft from fan pulley.
To reassemble the water pump. install the long
end of the sliaft No.
2,
in the pump body. No.
3
from the front end, until the outer end of bearing
is
flush with the front end of the pump body.
Dip seal No.
7
and seal washer No.
5
in brake
fluid and install in the impeller No.
8.
Place the
impeller on an arbor
press and press the long end
of sliaft
int0 tlie impeller, until the end of the shaft
is
flush with the impeller.
Support assembly on impeller end of
ahaft and
press tlie fan pulley on to shaft
so
tiíe end of shaft
is
flusli with the face of fan pulley-move the
shaft in the pump body so grooves in the bearing
and pump body line up and install bearing retain-
ing wire No.
4.
Anti-Freeze
Solution
IVhere air temperatures requil. it is necessary
to protect the cooling system with some type of
anti-freeze solution so as to prevent damage re-
sulting from freezing.
When alcohol is used
as
an anti-fmze solution
care niust be taken not to spill any of the solùtion
on the finished portions of the vehicle;
if
so,
it
sliould be washed off immediately with
a
gpod
supply of cold water, without wiping or rubbing.
FIG. 2-WATE.R PUMP ASSEMBLY
wlllyi
Ford
Wllly~
Pord
Put
P.tf
Put
I'P~,
NO.
No.
N".
N.me
Na.
No.
No.
N.m.
1
&l6289
GPR-8508-A
Fan
ind
Water
Pump
Pulley
6
m991
GW-W7
Wam
PumpSal
Wuhei
2
836287
GPUr-m0
Watei
I.urno
Bnnnt
d
Shift
Armbty
57
63W
GPW.8524
U'atn
Pump
54
A.*mbly
3
837052 GP\V.YI>US
\Viter
Pump
Body
8
639983
GP\YJiIZ
Water
Pump
Impllrr
4
<W8288
~~\~-8->ia
U'sin
Pump
Bc~ritu Rt<ilniat
Wk
9
637053
GPWXil3
\Vit=,
Pump
u>
Cvliods
Bi&
GUM
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