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figure 16). Bends in the piping, that can trap air bubbles,
should be avoided or ventilated (refer to figure 17).
Piping should not be fitted above the radiator!
Figure 16: Air traps should be avoided
Figure 17: Ventilating an air trap
Special attention should be paid to the ventilation of the
systems. Each installation system is standard supplied
with an expansion tank for the coolant, which is also used
to release air bubbles and makes it possible to add coolant
into the system in an easy way. This expansion tank
should be at the highest point of the system and mounted
as high as possible.
Most cooling problems originate from air traps
blocking the circulation of the engine coolant.
EN / W-SQ6/8/12/16 for mobile applications / December 2016
Figure 18: Alternator cooling system: open expansion tank
with overflow pillar
For the alternator cooling system we use an open -non
pressurised- system. Therefore the 12 mm overflow pillar
on the expansion tank should stay open (figure 18). A
piece of hose can be used to drain redundant liquid that is
thrown out because of the expansion of the liquid in the
system. When open the expansion tank can easily release
air that is ventilated by the different connections. As the
capacity of the alternator cooling system is very small, also
the initial filling can be done via the expansion tank. It
could be necessary to refill the tank a few times. The
pump of the alternator cooling system is self-priming and
this makes the system less sensitive for air traps.
For the engine we use a pressurised system. The 12 mm
connection on the top is closed. Wherever the radiators
are mounted it is necessary to ventilate the exhaust
manifold of the engine. The exhaust manifold has a 8 mm
connection to ventilate the manifold. There is an 8 mm
high pressure and high temperature resistant hose in the
delivery to connect the hose connection on the side of the
manifold with the expansion tank. (refer to figure 7 till 10).
Initially the engine cooling system can be filled via the cap
on the exhaust manifold of the engine. However when the
radiator is above the engine one can only fill the system to
INSTALLATION
15
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