O.S. Engines 91SZ-H - Manual (Page 16)

28
INSTALLATION OF THROTTLE SERVO
Servo output arm
Throttle arm
After the engine is installed in the helicopter, please
observe the following recommendations when linking
the throttle servo to the carburetor.
Locate the servo so that its output arm and the
throttle pushrod are, as close as possible,
directry in line with carburetor's throttle arm,
as shown. Throttle control rod A and B should be equal length.
Set the linkage so that the servo output arm and
throttle arm are parallel when the throttle stick on the
transmitter is at middle position. If differential throttle
movement is required, make necessary adjustment
at the transmitter.
27mm
29
CARE AND MAINTENANCE
The minute particles of foreign matter, that are
present in any fuel may, by accumulating and
partially obstructing fuel flow, cause engine
performance to become erratic and unreliable.
O.S. 'Super-Filters' (large and small)are available,
as optional extras, to deal with this problem.
One of these filters, installed on the outlet tube
inside your refueling container, will prevent the
entry of foreign material into the fuel tank. It is also
recommended that a good in-line filter be installed
between the tank and carburetor. 1. Finally, inject some after-run oil into the engine. Rotate
the engine a few times by hand, to make sure that it
is free, and then with an electric starter for 4 to 5
seconds to distribute the oil to all the working parts.
These procedures will reduce the risk of starting
difficulties and of internal corrosion after a period of
storage.
Do not inject after-run oil into the carburetor as this may
cause the O-rings inside the carburettor to deteriorate.
Note:
2.
3.
4.
Do not forget to clean the filters regularly to remove
dirt and lint that accumulate on the filter screens.
Also, clean the carburetor itself occasionally.
At the end of each operating session, drain out any
fuel that may remain in the fuel tank. Next, energize
the glowplug and try ot restart the engine to burn off
any fuel that may remain inside the engine.
Repeat this procedure until the engine fails to fire.
Remove the glowplug and eject any remaining fuel/oil
residue by rotating the engine with an electric starter
for 4 to 5 seconds while the engine is still warm.