Installation Manual
UL
POWER
UL390i UL390i
S
390i
SA
MI 390A01 Revision No: 3
Date:
2014-09-15
Page:
38
of
69
0°
45°
90°
120°
150°
180°
Instruction to fix the reusable hoses and fittings: see page 23
Instruction to fix the push-on hoses and fittings: see page 24
Connecting oil lines
Connect oil lines to the sandwich plate and the oil cooler. There is no particular in/out direction on
the cooler so you are free to connect them in the most suitable way. Gently tighten with a spanner
to ensure proper sealing. There is no need to pull as hard as you can and as a result possibly
damaging thread or connections.
End note
When engine is completely installed and is started up for the very first time, check for leaks in the
oil cooler assembly. Tighten where necessary.
Oil/Air Separator & Breather (UL390i; UL390iS; UL390iSA)
A breather tube is provided on the engine (picture 1). Connect this tube with provided hose to the
oil /air separator. An “oil return tube” is also provided on the engine (picture 2). Connect this tube
with the provided hose to the “return” side of the oil/air separator. The breather on an engine is
necessary to prevent any pressure build-up inside the engine casing due to normal leakage of blow-
by gases through the piston ring gaps. It lets the air or over-pressure escape from the engine
through a tube into the free air (outside the aircraft).
In most circumstances the breather not only pushes out air, but is also very likely to blow out some
oil that is scattered around inside the engine. To prevent too much oil (or any at all) being lost and
blown out into the free air, an oil/air separator is connected to the breather. The oil/air separator
is provided with the engine and "filters" out oil and lets it return to the engine before the air leaves
the aircraft.
Picture 1
Picture 2
(2)
