| owing to the possibility of engine seizure. Do not exceed specified torque figures for cylinder head nuts, given in the Data Section under "Cylinder Heads ".
Cars with anti-freeze mixture in the cooling system are to have a label attached to the header tank, indica-ting this fact. The following precautions are necessary on cars so marked
(a) Never fill the header tank up to the overflow. Leave space for the natural expansion of the mixture to avoid unnecessary topping up and consequent dilution. Top up when the system is warm.
(b) if the cooling system has to be emptied, run the mixture into a clean container and use again.
(c) If for any reason the mixture is lost and the system is filled with water, REMOVE THE ANTI-FREEZE LABEL ON THE HEADER TANK.
Heaters
A reliable anti-freeze mixture must always be used, because even when the cooling system is drained, a small amount of water remains in the heater unit. If this water freezes the heater unit will be seriously damaged. When refilling the cooling system with anti-freeze mixture (or when refilling with water) it is essential to have the water control valve, on the heater unit, fully open in order to prevent air becoming trapped in the heater system. The water valve is operated by the finger slide, and is fully open when the finger slide is in the maximum position on the temperature control panel.
COOLING SYSTEM—To clean
Periodically, the entire cooling system must be cleansed, particularly in districts where, contrary to instructions, water having a high, content of lime has been used for replenishing the radiator coolant.
Remove the radiator filler cap SLOWLY , so as to gradually vent the air pressure within the header tank and, therefore, prevent the possibility of scalding.
Open drain tap in bottom of radiator (or preferably remove the tap completely), when engine is still hot; also open the cylinder block drain taps.
Allow time for the engine to cool after all water has drained off. When cold, remove the top hose from the radiator connection and flush the radiator through with a high-pressure water hose to remove all loose sediment.
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Allow to drain and then close the drain taps, or refit if removed and reconnect the hose to the radiator connection.
Fill the system to normal level with a cleansing solution (several reliable brands of which are available) and run the engine as directed by the makers of the solution.
Solutions containing caustic soda must hot be used. It is important to drain off the cleansing solution directly it has been used for its recommended period.
Finally, flush the system thoroughly with running water by means of a hose, turn off drain taps and fill system to normal level with soft water or anti-freeze mixture as required.
A furred * radiator which is removed from a vehicle during overhaul must not be allowed to dry out, as when this occurs, the deposit inside will set hard and will not soften when the radiator is refilled and used again. Always cleanse the radiator immediately and whilst still wet inside, or seal up the apertures and fill with water pending treat-ment. Alternatively, the radiator can be left immersed in a tank of water.
Do not invert the radiator or lay it flat as this could allow any sediment which has accumulated in the bottom tank to find its way into the cooling ducts. Always store the radiator in its normal upright position.
When using flushing compounds it is important to avoid splashing the paintwork of the car as they can have an injurious effect.
In very dusty conditions, and where insects are numerous, the radiator gills must be kept clean by blowing through with compressed air from the engine side.
THERMOSTAT
A poppet-type thermostat is mounted in a recess in the coolant outlet passage at the front of the intake manifold.
When the thermostat is closed, coolant flows to the water pump through a bypass passage at the front of the engine. When the thermostat is open, coolant flows through the coolant outlet elbow (thermostat housing) to the radiator.
The thermostat used in production is for use with water or permanent-type anti-freeze. A thermostat is also available for use with non-permanent-type anti-freeze or water. For operating temperatures, refer to the "General Data " Section.
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