The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 44
ALL 19-3-2019
Water and Oil
Although hot weather is the most common cause of overheating, many other factors can
cause the same problem. If your engine overheats in flight in normal weather, one of the
following may be the culprit: The water and coolant level in the radiator is low. There's a leak
in the cooling system, air bubbles appear in your closed water circuit, your cowling is not built
to cool the engine enough !
D-Motor International builds solid engines.
The long life and safe life of our engines is linked directly with the operation temperature of
the water, air and oil !
We would like to inform the OEM / Integrators of our engines to test the engine after
integration thoroughly !
As engine manufacturer, we do not have a hand in the cowling or cooling system that is
used!
Our Engine Control Unit (ECU) logs all active temperatures at a rate of 10/5 or 2 samples per
second. (depending on the software version).
Water is used to cool down the D-Motor engine. it has high specific heat capacity. It can
absorb a large amount of heat without a high increase in temperature.
Why cooling ?
Internal combustion engines remove waste heat through cool intake air, hot exhaust gases,
and explicit engine cooling. ... Thus, all heat engines need cooling to operate. Cooling
is also needed because high temperatures damage engine materials and lubricants and
becomes even more important in hot climates.
The cooling system is composed of six main parts—an engine, a radiator, a water pump,
a cooling fan, hoses, and a thermostat. During the combustion process, some of the fuel
energy is converted into heat. This heat is transferred to the coolant being circulated through
the engine by the water pump.
Our EOM (Engine operating Manual) defines the following recommendations :
Oil pressure 1.5 - 5.0 bar (21 – 72 psi)
Oil specification Synthetic 5W60 - 5W40 – (0W60 – 0W40 cold regions)
Oil quantity 3.5 Liters (0.40 US Gal) NEEDED (different lengths of oil
hoses,
cooling radiator, etc. will need more oil then 3 or 3.5 litres) –
See maintenance Information Bulletin !
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