O.S. engine FS-120S-E - Engine Introduction and Components

NEEDLE VALVE EXTENSION
The needle-valve supplied with this engine is designed to in-
corporate an extension so that, when the engine is enclosed
within the fuselage, the needle-valve may be adjusted from
the outside. An L-shaped rod, of 1.6 — 1.8 mm dia. and
appropriate length, should be inserted into the needle’s
centre hole and secured by tightening the set-screw in the
needle-valve knob with the small Allen key provided.
CARE AND MAINTENANCE
To ensure-that you obtain long life and peak performance
from your engine, observe the following.
1. Avoid running the engine under dusty conditions. It
necessary, lay a sheet of plywood or hardboard in front
and under the nose of the model when starting the
engine.
2. Foreign matter in the fuel can cause the carburettor jet
to be partially clogged. Therefore:
rinse out the fuel tank with methanol or fuel before
installing it
fit a fuel filter in the fuel delivery tube between tank
and carburettor
e fit a fuel filter to the outlet of your squeeze bottle, or
to the pump inlet if you use a manual or electric pump
e do not leave your fuel container open needlessly
e check filters periodically and clean them when necessary.
3. Do not leave raw fuel in the engine at the conclusion of
a flying session: it may cause corrosion. The best practice
is to disconnect the delivery tube from the carburettor
while the engine is running.
Remaining fuel in the tank should also be drained off.
IMPORTANT: After the engine has run dry, liberally inject
corrosion-inhibiting oil or light machine oil into
the crankcase, via the breather hole, until excess oil
runs from .behind the drive hub when the engine
is pointed downwards. Rotate the crankshaft to
distribute the oil to the bearings, etc. Failure to
carry out this procedure may cause interna! rusting,
resulting in engine malfunction and voiding the
warranty.
4. Clean the exterior of the engine with a clean cotton
cloth. If this is not done, oil and dirt will burn onto the
outside of the engine each time it is run and the engine
will soon become blackened.
5. If the engine is not to be used for a while (more than
two months) remove the glowplug and rinse out the
interior with kerosene (not gasoline), by rotating the
crankshaft. Shake out residue, then inject corrosion-
inhibiting oil or light machine-oil through the exhaust
pipe and breather hole, again rotating the shaft to distri-
bute the protective oil to all working parts.
6. Avoid unnecessary dismantling of your engine.
PARTS LIST
Code No. | Description || Code No. | Description
45501020 Crankcase | 45530010 | Crankshaft Bearing (Rear)
45501110 Cam Cover | 45231100 | Camshaft Bearing
45502011 Crankshaft | 45560030 | Intake Valve Assembly
45503100 Cylinder Liner | 45560040 | Exhaust Valve Assembly
45503210 Piston | 45561010 Rocker Arm Assembly
45503400 Piston Ring ee Rocker Support Assembly
45504020 Cylinder Head (w/Valve Ass'y) | 45562010 | Camshaft
45505010 Connecting Rod | 45566101 Push Rod Cover Assembly
45506010 Piston Pin | 45569420 Intake Pipe |
29017004 Piston Pin Retainer | 45581000 Carburettor Complete
45507010 Cover Plate | 45484000 | Choke Valve Assembly
45508030 Drive Hub (w/Key) | 45525001 | Silencer Assembly
45508200 Woodruff Key | 71615009 | Glow Plug Type " F "
45514010 | Gasket Set || #72140400 | EX-502 Exhaust Header Pipe (120 IN)
29031009 | Crankshaft Bearing (Front) || *72140500 | EX-502 Exhaust Header Pipe (120 C)
* Optional parts
The specifications are subject to alteration for improvement without notice.
GS. ENGINES mreco.ro
6-15 3-chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan TEL.(06)702-0225
FAX.(06)704-2722
©
Copyright
1989
by
O.S.
Engines
Mfg.
Co.,
Ltd.
All
rights
reserved.
Printed
in
Japan
60090510-19805