Rotax 912 ULS 3 - Purging of Lubrication System

page 78
May 01/2007
Effectivity: 912 Series
Edition 1 / Rev. 0
d04055
INSTALLATION MANUAL
BRP-Rotax
13.10) Purging of lubrication system
See Fig. 51.
- Verify that oil tank connections are connected correctly and secured, and that
the oil cooler (if fitted) is in the suction line (1) between the oil tank and the oil
pump inlet. Verify that the oil tank is filled up to the maximum level (to the top
of the flat portion of the dipstick). Additional oil (up to 0.5 litre) may be added
to the tank for the purpose of this procedure.
■ CAUTION: Incorrectly connected oil lines to the oil tank or to the engine will
result in severe engine damage.
- Disconnect oil line (2) at the oil tank connection.
- Place the free end (3) of the return oil line into a suitable container (4) below
the engine.
- Plug open connection (5) at the oil tank with suitable air tight cap. See Fig.
51.
- Remove the spark plug connectors.
- For easier rotation of engine remove one spark plug from each cylinder.
■ CAUTION: Prevent entering of foreign substance through spark plug hole.
- Using a compressed air line, pressurize the oil tank through its breather
connection (6) (on the neck of the tank). Adjust the compressor outlet
regulator so that the air line pressure is between 0,4 (6 psi) and 1 bar (15 psi).
Do not exceed 1 bar (15 psi).
◆ NOTE: Oil tank cover is not designed to hold pressure. Some air will
escape.
▲ WARNING: Do not remove oil tank or cover before ensuring that air
pressure has been completely released from the tank.
- The pressure in the oil tank has to be maintained during the following step.
■ CAUTION: It is possible to empty the oil tank and as a result introduce
more air into the oil system. Pay attention to the oil level and
fill tank as required.
- Turn the engine by hand in direction of normal rotation until the first pressure
indication on the oil pressure gauge. Normally this will take approx. 20 turns.
Depending on installation it may take up to 60 turns.
■ CAUTION: Do not use starter for this purpose. Fit propeller and use it to turn
engine.