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ENGINE
ENGINE DESCRIPTION
2-19
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FMj
HUB
I
-
SHA FT & BEARIN G
A
SSEMBl
Y
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al
L
SCREW
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l.
W A
SHER
IM PEllER-
PRE
SS
THIS
FACE
FLUSH
WITH
END
OF
SHAFT
I. !
-
COVER
II'
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GASKET
i
Figure 2-1 8-Sectional View of First Type Water Pump-
1948 Engines
The coolant is circulated by a heavy duty cen-
trifugal
water
pump mounted on the front end
of
the cylinder
crankcase. The fan and pulley
are mounted
on
the outer
end of the pump shaft
so that
the
pump and fan are driven by a belt
from a pull
ey
on
the
crankshaft.
The
pump
shaft is
incorporated
in a double-row ball bear-
ing which is
seal ed
at both ends to exclude dirt
and
water
and is
lubricated
during manufac-
ture
so that no furth
er
lubrication is required.
The pump is
seal ed
against leakage by a pack-
less
non
-adjustable seal
assembly mounted in
the pump bod
y
in position to
bear
against the
hub of
impeller. See figures 2-18
and 2-19
.
Two different
water
pumps, diff
ering
prin-
cipally
in
the
design of the
seal ,
are used on
1948 m
odel en
gines.
The first t
ype water
pump
is used on engines in cars equ
ipped
with Sy
n-
cro-Mesh transmissions. The second
t
ype pump
is
used
in
cars
equipped w
ith Dynaflow
Dri ve
and in last
pr oduction
cars
equi pped with
Syncro-Mesh t
ransmissions.
The
second type
pump is used on
all 1949
model engine s.
In the
firs t typ
e
1948
water pump
the
seal
assembly is
composed
of a brass shell,
a carbon
ring and rubber washer
bonded t
oget he r.
The
brass shell is
pressed
on the hub of pump body
Figure
2-19-Sectional
View of Water
Pump-·2nd
Type 1948 and
All 1949
and a
helical
spring
presses
the carbon ring
against the hub
of impeller
to seal aga inst pas-
sage
of
water . See
figu
r e 2-18.
In
the
secon d
type
1948
w
ater pu m p
(used in
1949),
the seal assembly is composed
of a brass
sle
eve,
a
helical
spri ng,
a rubber bellows,
and
a
ca
r bon wa
sh er.
Th
e brass
sle
eve
is pressed
into
the
hub of
pump
bod
y. The
spring presses
the
flanged
ends of
the rubber
bellows against
the
sleeve
and
t
he
ca
r bon
washer,
and also
press es
the carbon
washer against the
hub of
impeller
to seal against
pas sage
of water. See
figure 2-19. Two r
idges
pressed
in the brass
sle
eve
engage
not ches
in the ca r bon washer to
prevent the washer f
r om turning with the im-
pell
er.
All
Seri es 40-50, a
nd
1948 Series
70 when
equipped with
Syncro-Mesh transmissions,
use
Harrison
V-type
cellular radiator cores having
copper water passages and copper cooling fins.
Series 70 cars equipped with Dynaflow Drive
use Harrison
tube
and fin
type
radiator
cores.
A
thermo-gauge to
indicate temperat ure of
coolant
is
mounted
on instrument panel.
The
gauge assembly includes a
capillar y tube with
a bulb
which attaches to t
he cylinder head so
as t
o
exte nd int o
the water j
acket.
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