Reference
Modification no.
- 0 -
Page
84
Date
1997 02 01
Main
914 F
01476
11.10)Treatment of corrosion and surface damages
At longer standstill it may occur that a rust film forms on various metal parts. With
considerable corrosion or heavily corroded screws, nuts, shims, bearings, bushes
etc., an exchange is inevitable.
Propeller shaft
As preventive measure against formation of rust grease the prop flange slightly but
ensure to keep the support face for the propeller clear.
A rusty flange of the prop shaft can be cleaned after removal from the gearboy and
covering all bearing seat
s with a plastic tape by shot blasting with MICRONORM with incorporated anticorrosive.
At heavy rust damage, when the material is affected, renewal of the propeller shaft is
necessary.
Electric system
Formation of a rust film on the permanent magnets in the magneto flywheel and on the
metal cores of the pick-ups is harmless. Replace fixation screws and lock washers at
heavy oxidation or rust formation. Before reassembly clean all contact surfaces of the
screws removed and apply LITHIUM grease. Take care that no foreign material falls
into the magneto flywheel. Clean cable shoes and apply LITHIUM grease to the
contact surfaces to assure lasting contact.
Check contact between plugs and/or fasten connections by separation test, if neces-
sary apply contact spray to increase conductivity.
11.11)Engine preservation
Due to the special material of the cylinder wall, the ROTAX aircraft engine needs no
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 the oil.
— Drain carburetor float chambers.
— Apply motor oil to all joints on carburetors.
— Close all openings on the cold engine, like exhaust end pipe, venting tube and air
intake against entry of dirt and humidity.
— Spray all external engine steel parts with corrosion inhibiting oil.
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