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, protect
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.
FiIIing 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 anti-
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-
'Commences
freeze
to fre eze Frozen solid
Amount
of
anti-freeze
%
°C
OF
°C
OF
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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