M-Sc3.5 Oil Cooler - Whisper Power M-SC3.5 Manual

INSTALLATION
Most cooling problems originate from air traps
blocking the circulation of the engine coolant.
It is prescribed to have the expansion tank of
the engine cooling system connected to the
outlet connection of the cooler unit.
Figure 4:
7 litres optional expansion tank with low level alarm.
As a keel-cooling system mostly contains much coolant a
large seven litres expansion tank with low level alarm is
recommended for the engine cooling system (refer to fig. 4
and fig. 5, detail A)
The alternator system can be ventilated on the box cooler
and a small expansion tank will be sufficient (refer to figure
5 detail B).
2.1.4

M-SC3.5 oil cooler

The M-SC3.5 is different from all other models because
the engine is cooled by oil and not by cooling liquid.
There are 2 ways to design the cooling:
1) Using separate box coolers; one for the oil cooling
and one for the generator coolant.
Figure 5: Box cooling with 7 liters expansion tank
6
The engine oil cooling system for the M-SC3.5 does not
need an expansion tank as the system is ventilated in the
engine. The piping of the oil cooling system should be
according to the dimensions listed in the kits and the total
length should not exceed 6 meters to prevent an excess of
expanding oil and a too high backpressure.
As the cooler box will be positioned in the bottom or side
and therefore lower than the engine, no additional valves
are necessary, however a valve could be fitted by the
factory as standard for radiator application and it is
recommended to be removed. This valve will be necessary
when the cooler is mounted higher than the engine (refer
to figure 6).
2) Using a heat exchanger to cool the oil indirectly. The
coolant through the heat exchanger is the same as to cool
the alternator.
This is the easiest way from the point of installation as one
only need one box cooler, but the cooler must have the
extra capacity to cool down the coolant for both jobs.
When the capacity is too little the alternator temperature
will be high and this could reduce output power and output
voltage.
Pressure valve in
oil return line
Figure 6:
The pressure valve in the return oil line prevents the engine
from overflowing as a result of siphoning if the cooler is
situated above the engine.
September 2010 / WhisperPower keel cooling / EN