Checks; Engine Preservation - Rotax 912 series Operator's Manual

11)Checks

All checks to be carried out as specified in the current Maintenance Manual (last
revision).
WARNING:
ATTENTION: Carry out all directives of Technical Bulletins, according to their

11.1) Engine preservation

Due to the special material of the cylinder wall, there is no need for extra
protection against corrosion. At extreme climatic conditions and for long out
of service periods we recommend the following to protect the valve guides
against corrosion:
– Let engine run until warm, then change oil.
– Remove the air intake filters and insert approx. 30 cm³ (1 fl oz) of
corrosion inhibiting oil into the carburetor throat with the engine running
at increased idle speed. Shut off engine.
– Drain carburetor float chamber.
– Apply oil to all joints on carburetors.
– Close all openings on the cold engine, such as exhaust end pipe,
venting tube, air filter etc. against entry of dirt and humidity.
– Spray all steel external engine parts with corrosion inhibiting oil.
Engine back to operation
– Remove all plugs and fasteners.
– Clean spark plugs with plastic brush and solvent.
– If preservation including oil change took place within a year of storage,
oil renewal will not be necessary. For longer storage periods repeat
preservation annually.
Effectivity: 912 Serie
OM initial issue
Only qualified staff (authorized by the Aviation Authorities)
trained on this particular engine, is allowed to carry out
maintenance and repair work.
priority.
AIRCRAFT ENGINES
page 11 - 1
July 01/98