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COOLING SYSTEM
Expansion
The expansion tank (1) and the spill tank (2) collects the coolant
displaced
by
tank and cap
expansion when the engine is heated to normal running temperature.
The
Fig.
1 displaced coolant
is.returned
to the radiator when the system cools. The cap
(3)
on the expansion tank maintains the
pressure in the
cooling system to 15
lbf/in"
(1·05
kgf/cm")
maximum when the engine is
running. If
the sytem is hot, pro
tect
the hands against escaping steam, turn the
cap anti-clockwise
until the stop
is
felt, wait until all pressure has escaped, then press down and 'turn further
until
the cap can be lifted off.
Checking
The coolant level must only be checked
when
the system is
cold.'
Remove
the
expansion tank cap to check the coolant
level
which must be maintained to
the
half-full point of the tank.
Draining
To drain the cooling
system,
stand the car
on
level ground, remove the
expansion
Fig.
1 tank cap (3), and the filler plug (4) from the coolant outlet elbow. Slacken
the
hose clip and disconnect the bottom hose
(5) at
its connection to the
radiator.
Remove the drain plug (6) on the
cylinder block
.
Collect the coolant in a clean container if
it is
to be used again as cars are
filled
with a 50 per cent solution of anti-freeze before they leave the factory
.
There is no provision for draining the heater, expansion tank or spill tank.
Fi II ing
Anti-freeze
must be
used in the cooling system when freezing conditions
are
Fig.
1 encountered.
Refit the
drain
plug (6), re-connect the bottom hose to the radiator, and check
all
other hose connections.
Fill the system with coolant through the filler orifice until the level is up to
the
bottom of the
threads.
Refit the filler plug. Top up the expansion tank
with
coolant to the half-full point and refit the cap.
Run the engine until normal operating temperature is
reached.
Stop the
engine,
allow the system to cool, and remove the expansion tank cap. Remove the
filler
plug and 'top up to the bottom of the threads and refit the filler plug. Top
up
the expansion tank to the half full point and refit the cap.
Fig.
1
Frost
Water expands when it freezes, and if precautions are not taken there is con-
precautions
siderable risk of bursting the radiator, cylinder block, or heater. The heater unit
cannot be drained with the cooling system; it is therefore essential to use anti-
freeze in the cooling system in freezing conditions.
'
When freezing conditions are likely to
be
encountered, have the
specific
gravity
of the coolant checked by your authorized Austin MG Dealer, and add
an
ti-
freeze to give the required protection.
After the second year the system should be drained and flushed by
inserting a
hose in the filling orifice and allowing water to flow through until
clean. Ma
sure that the cooling system is water-tight, examine all joints and
replace any
defective hose with a new one. Refill with the appropriate anti-freeze
solution
and add 0·25 pint (t U.S.. pint, 0·15 litre) of neat anti-freeze to the
expansion
tank.
We recommend owners to use an ethylene glycol based anti-freeze to specification
B.S. 3151/2 or S.A.E. JI034 to protect the cooling system during frosty weather
and reduce corrosion to the minimum.
The correct quantities of anti-freeze for
different
degrees of frost protection are:
Anti-
'
C
ommences
freeze
to fre
eze
Froze n solid
Amount of anti-freeze
%
°C
O
F
°C
O
F
Pts.
U.S.
Pts.
Litres
25
-13
9
-
26
-
15
2!
3
1·42
33t
-19
-
2
-
36
-
33
3
4
1·84
50
-36
-
33
-
48
-
53
4i
5i
2·7
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