Care And Maintenance - O.S. engine MAX-75AX-BE Instruction Manual

Please pay attention to the matters
described below to ensure that your engine
serves you well in regard to performance,
reliability and long life.
As previously mentioned, it is vitally important
to avoid operating the engine in conditions
where dust, disturbed by the propeller, may
be deposited on the engine and enter its
working parts.
Remember to keep your fuel container
closed to prevent foreign matter from
contaminating the fuel.
Once opened, fuel deteriorates as days go
by. Use up as soon as possible after
opening the container. Also, keep it cool and
in a dark place.
Do not close the needlevalve and mixture
control valve too far as this will cause a lean
setting and over heating of the engine.
Always adjust the needlevalve slightly on the
rich side of peak rpm.
Do not leave unused fuel in the engine at the
conclusion of a day's flying. Accepted
practice is to cut off the fuel supply while the
engine is still running at full throttle, then
expel as much fuel residue as possible by
turning the engine over 5-10 seconds with
the electric starter.

CARE AND MAINTENANCE

Install a fuel filter to prevent foreign matter in
the fuel container from entering the fuel tank.
O.S. Super Filters (L) and (S) are available
as optional extras.
Install an in-line fuel filter between the tank
and carburetor to prevent foreign matter in
the tank from entering the carburetor.
Clean these filters periodically.
If these precautions are neglected, restriction
of fuel flow may cause the engine to cut out,
or the fuel/air mixture to become too lean
causing the engine to overheat.
36
When the engine is not to be used for some
months (for example, as between flying
seasons), a worthwhile precaution is to
remove it from the airframe and, after
washing off the exterior with alcohol (not
gasoline nor kerosene), remove carefully the
carburetor, glow plug and all silicone tubing
and put them safely aside. Then, immerse
the engine in a container of alcohol. Rotate
the crankshaft while the engine is immersed.
If foreign matter is visible in the alcohol, rinse
the engine again in clean alcohol. Finally,
shake off and dry the alcohol ,and inject
some after-run oil in the glowplug hole and
rotate the crankshaft several times by hand.
Reinstall the carburetor and glowplug on the
engine and keep it in a dry place after putting
in a vinyl bag.
37