Thermostat; Raw Water Pump - Volvo Penta TAMD71B Instruction Manual

Marine genset engine

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10.1 Thermostat

The engines have a piston thermostat which has

a bulb filled with wax. When the engine is cold,

the thermostat keeps the route to the heat ex-

changer completely closed. The coolant is then

fed directly back to the engine through a by-

pass line. After the engine has warmed up, the

volume of the wax increases and the thermostat

subsequently opens the route to the heat ex-

changer, while the by-pass line is closed.

Fig. 10.3 Thermostat function, cold engine

The raw water pump is fitted to the timing gear

cover at the front of the engine. This pump is

driven via the timing gears. The pump impeller is

made of rubber and can be replaced.

Note: The impeller may be damaged if the pump is run dry.

AB Volvo Penta / Diesel Engine TAMD71B

Fig. 10.2 Coolant Pump (circulation pump) and

thermostat housing

1. Piston thermostat

Fig. 10.4 Thermostat function at operating temperature

Fig. 10.5 Raw water pump

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