The instrument is not adjustable or repair-
able and when a test shows inaccuracies or
damage on inspection
it
will
be necessary to
replace the complete instrument.
12.
THE RADIATOR
The radiator is of the finned pipe type and
is secured to the chassis and body of the
car
at four points. The upper extremity is
attached by two nuts and bolts with lock
washers to the steady rods, which are in turn
secured to the body of the car by jam nuts.
The lower attachment is by two pointed
shanked bolts with
4"
thick composition
packings between the radiator brackets and
the chassis frame at either side.
The radiator is pressurised, a relief valve
being incorporated
in
the radiator cap. The
spring loaded rubber .valve is lifted off its
seating when the pressure in the cooling
system exceeds
4
lbs. per sq. inch letting the
excess pressure escape through the overflow
pipe.
To relieve the vacuum when the system
cools a small spring-loaded relief valve is
incorporated in the centre of the pressure
valve unit which
will
open to admit atmos-
pheric pressure.
The overflow pipe is a rubber tube and is
attached to the filler pipe, clipped at the
right hand steady attachment, and after
running downward it is clipped to the lower
right hand wing valance.
13.
TO REMOVE RADIATOR
Remove the front cowling as described
in the Body Section.
Drain the cooling system as
described
on page
1.
Remove top and bottom hoses and
overflow pipe from radiator.
Remove the nuts and bolts from the
two steady rods, one either side at the
top of the radiator.
Remove the two bolts and lock washers
from the brackets at the sides of the
block.
The packing between bracket
and chassis frame can be removed
after
the radiator has been lifted.
14.
TO REPLACE RADIATOR
The replacement of the radiator is the
reversal of the removal.
15.
FLEXIBLE HOSE CONNECTIONS
(Fig.
5)
Four hoses are used in the system and
all
are
moulded rubber with a fibre insert.
They
are secured to their mating parts by
"
Supergrip
"
hose clips.
The smaller diameter curved hose is the by-
pass hose for the thermostat-water pump
housing connection, the larger diameter
straight corrugated hose connects
thetherm-
ostat housing to the radiator.
The two large diameter
curved hoses are
assembled to a metal connecting pipe so that
their ends are
90"
removed from one
another. This assembly connects the water
pump housing to the radiator outlet.
The overflow pipe is attached to the filler
pipe, clipped at the top right hand upper
corner of the radiator and again on its
m
down at a point on the wing valance just
above the chassis frame.
16.
THE
WATER PUMP ASSEMBLY
(Fig.
7)
This assembly is attached to the cylinder
block by three bolts of unequal length. The
longer bolt is situated in the upper right
hand position and its purpose is two-fold.
In addition to attaching the pump assembly
to the cylinder block it also secures the bear-
ing housing to the pump body. The head
of this bolt is trapped by the belt pulley
and the bolt cannot be removed
until
this
pulley is first removed. The two remaining
bolts are of equal length and are situated
in
the lower extremities of the impeller body.
17.
TO
REMOVE
THE WATER
PUMP BEARING HOUSING (Fig.
7)
(a)
Loosen the two lower dynamo attach-
ments, remove the upper fixing bolt
with the two plain washers and then
remove the fan belt.
(b)
Loosen the two nuts and the bolt secur-
ing the bearing housing to the pump
body progressively until the bearing
housing can be lifted away
with its
joint washer.
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