AE50R, AE50RA
AE50RAB
Engine Manual
Doc. No. E1.01.01-E Rev. 6 10-March-2011 Page 8-3
8.5.2 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.
8.5.3 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.
8.5.4 Coolant Temperature Sensor
A temperature sensor is fitted to the engine in the front plate, for connecting to a temperature
gauge.
8.5.5 Coolant
Coolant is a 50 / 50 water – ethylene glycol mix. For details refer to Chapter 5.2.6
CAUTION !
The use of a pre–mix solution such as Silkolene Pro–Cool is
strongly recommended so that there is no variation in the
strength or the heat transfer properties of the coolant.
8.5.6 System Pressure
The cooling system is a closed loop system, designed for a working pressure of 0.9 bar
(13 psi).
8.5.7 Air cooling system
Lubrication of the eccentric shaft rear bearings is achieved by direct injection of oil from the
metering oil unit and results in an oil mist being entrained into the rotor cooling air system. The
oil mist, in turn, lubricates the rotor bearing, front main bearing and cools the inside of the
rotor.
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