Lubrication System; Mixture Lubrication; Oil Injection For Engine Lubrication; 1) General Advice - Rotax 447 UL SCDI Installation Manual

12) Lubrication system

If the engine is to be used inverted (with spark plugs pointing down) select a lubricant
which features low carbon deposits. Oil residues tend to drain to low points, i.e. spark
plug cavities. If these residues fail to burn during normal operation, plug fouling will
occur, possibly causing pre-ignition. Producers of suitable lubricants will issue
warranty of their products.

12.1) Mixture lubrication

Refer to latest version of current Operator's Manual.

12.2) Oil injection for engine lubrication

12.2.1)
12.2.2)
12.2.3)
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
AIRCRAFT ENGINES
INSTALLATION MANUAL
General advice:
The oil pump driven by the crankshaft via the pump gear supplies fresh oil
for engine lubrication. The oil pump is a piston type pump with a metering
system. Via diffuser jets in the intake cover or intake socket each cylinder
is supplied with exactly proportioned quantity of two-stroke oil. The oil
quantity consumed is defined by the engine r.p.m and the oil pump lever
position. This lever is actuated via a Bowden cable connected to the
throttle cable. The oil flows to the pump from an oil tank by gravity.
▲ WARNING: In case of fresh oil lubrication the carburetors are supplied
with pure gasoline (no oil/gasoline mixture).
Technical data and configuration:
Oil: Super two-stroke oil.
The oil pump assy. features an oil return nipple and two oil exit nipples with
integrated check valve.

Installation

1 ) Oil tank capacity: The oil tank size should be more than 5 % of the fuel
tank capacity.
2) The oil tank bottom outlet must not be below the oil pump inlet nipple,
even at the greatest possible inclination of the aircraft (i.e. dimension
Hs must be greater than zero, see fig. no. 20).
3) Use a firm, oil-resistant suction hose which cannot be squeezed.
Secure it with clamps at the connections.
4) Install an adequate oil filter between oil tank and oil pump.
5) Install a Bowden cable to actuate the pump lever simultaneously with
the carburetors.
■ ATTENTION: At a pump cable breakage or failure. On the ROTAX
582 engine, oil pump is set to minimum discharge.
On the ROTAX 503 engine the oil pump is set to
maximum discharge.
page 12 - 1
Initial issue, May 01/99