Cooling s�stem
General
Sea water pump
The engines are fresh water cooled and fitted with an
enclosed cooling system. The system is divided into
two circuits.
The sea water pump is fitted on the timing gear housing
at the front end of the engine. The pump is driven via the
engine�s timing gears. The pump wheel (impeller) is man-
ufactured of rubber and is replaceable.
In the inner circuit (fresh water system) the refrigerant is
pumped round by a circulation pump which is driven by
a V-belt from the crankshaft pulley.
Note: The pump wheel will become damaged if the pump
is run dry.
The fresh water system works at a certain overpres-
sure, whereby the risk of boiling is reduced at high tem-
peratures. A pressure valve opens in the filler cap if the
pressure gets higher than normal.
The temperature of the refrigerant is regulated by a
thermostat.
The percolation in the sea water system is handled by a
gear driven pump of the blade type.
Heat is transferred from the refrigerant to the sea water
in a heat exchanger.
As extra equipment the engine can be fitted with a sep-
arate expansion tank.
Fig. 104. Filler cap for refrigerant
Thermostat
The engines are provided with a thermostat, the sensor
body of which contains wax.
When the engine is cold the thermostat keeps the chan-
nel to the heat exchanger closed. The refrigerant then
passes via a a by-pass pipe directly back to the induc-
tion side of the pump. As the engine heats up the wax
increases in volume and the thermostat gradually opens
the channel to the heat exchanger, at the same time as
the by-pass pipe is closed.
See "Technical data" for opening temperatures.
62
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
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| Copyright | Attribution Non-commercial |
(4 votes, average: 4.25 out of 5)
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Ö, hur dka jag veta om det är bra innan jag set produkten.
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