| GENERAL DESCRIPTION
A by-pass port on the water pump is connected to the coolant outlet housing to permit coolant circulation within the engine when the thermostat is closed, by-passing the cross-flow radiator, which has Its header tank remote.
A vane-type, cast iron impellor supplies coolant through centrifugal action to the water pump outlet ports, one for each cylinder bank, to provide uniform coolant circulation in both banks of the engine.
The water pump has a sealed bearing which is integral with the water pump shaft; the bearing requires no lubrication. A bleed hole, in the water pump housing, allows coolant that may leak past the seal to be thrown out by the slinger.
The cooling fan hub is pressed a specified distance on to the water pump shaft.
Radiator relief valve
Incorporated in the filler cap of the remote header tank Is a spring-loaded relief valve which prevents water loss through the overflow pipe when the coolant is at normal level.
In addition, this valve allows a small pressure to build up in the cooling system. This raises the boiling point of the coolant which is a great advantage in high altitudes and in tropical conditions.
As the cooling system temperature falls, partial vacuum is formed. This is relieved by the entry of air through the overflow pipe and the vacuum release valve which is built into the pressure relief valve.
Details of the relief valve release pressures are given in the General Data Section under "Cooling System".
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DRAINING THE COOLING SYSTEM
(Refer to Fig. 1)
The radiator drain tap (C) is situated under the left-hand of the radiator, and the two cylinder block drain taps are positioned, one forward of the gearbox bell housing mounting-flange on the left-hand side (A), and the other on the right-hand side forward of the engine mounting (B).
All three taps are opened by turning them in an anti-clockwise direction. When draining the cooling system, ensure that the heater temperature control is set to the HOT position.
REFILLING THE COOLING SYSTEM
Whenever possible clean rainwater, or softened water is to be used in preference to water taken from a mains supply.
The heater control must be set to the HOT position.
Under extreme cold conditions, warm, but not boiling water, may be used if required. Water, or anti-freeze solution must be poured in slowly to prevent air locks. After filling, the engine is to be run for a short time and the level re-checked to ensure that no loss of water has occurred due to filling of the heater.
FROST PRECAUTIONS
Without using anti-freeze:
When the car is used in very cold weather without anti-freeze in the cooling system, great care should be taken to ensure that the radiator is warm before at-tempting to drive the vehicle. If this is neglected there is a danger that the radiator may freeze if the car is driven in temperatures below freezing point before the thermo-stat is open. In cold weather the bottom of the radiator should be blanked off so that its bottom tank keeps warm, because it is here that freezing commences.
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