ENGINE MANUAL
IAE50R – AA
8.2 Cooling System
8.2.1 Liquid Cooling System
Fig. 8: Coolant circuit items
8.2.2 Water Pump
A water pump impeller, driven from the eccentric shaft via a tufnol drive coupling (a shear
point) is mounted at the rear of the engine and circulates coolant through the engine casting
and radiator.
8.2.3 Temperature Regulation
No thermostat is fitted. A minimum coolant temperature of 60 °C must be maintained and a
normal operating temperature of 70 °C is desirable.
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