Os-engines 55AX User Manual download pdf (Page 14)

26

Attention :

Do not choke the carburetor air intake when

applying the starter. This could cause an

excessive amount of fuel to be drawn into the

cylinder which may initiate an hydraulic lock

and damage the engine.

If the engine does not start within 10 repeat

applications of the starter, remove the glow-

plug, check that it glows brightly and that the

cylinder is not flooded with fuel. (To eject

excess fuel, close needle-valve and apply

starter with glowplug removed.) Then try again.

Note:

Make sure that the throttle linkage is made

so that the throttle is fully closed when the

throttle lever as well as trim lever on the

transmitter are fully pulled down.

How to stop the engine

Pull down the throttle lever and trim lever on

the transmitter fully.

Close

VERY IMPORTANT!

Before being operated at full power (i.e. at full-

throttle and with the needle-valve closed to its

optimum setting) the engine must be adequately

run-in, otherwise there is a danger of it becoming

overheated and damaged.

27

Install the engine with the propeller intended

for your model. Open the needle-valve to the

advised starting setting and start the engine.

If the engine stops when the glow plug

battery is disconnected, open the needle-

valve to the point where the engine does not

stop.Run the engine for one minute with the

throttle fully open, but with the needle-valve

adjusted for rich, slow "four-cycle"operation.

RUNNING-IN (“Breaking-in”)

Now close the needle-valve until the engine

speeds up to "two-cycle"operation and allow

it to run for about 10 seconds, then reopen

the needle-valve to bring the engine back to

"four-cycle"operation and run it for another

10 seconds. Repeat this procedure until the

fuel tank is empty.

2.

All internal-combustion engines benefit from

extra care when they are run for the first few

timesknown as running-in or breaking-in.

This allows the working parts to mate together

under load at operating temperature.

Therefore, it is vitally important to complete the

break-in before allowing the engine to run

continuously at high speed and before

finalizing carburetor adjustments.

However, because O.S. engines are produced

with the aid of the finest modern precision

machinery and from the best and most suitable

materials, only a short and simple running-in

procedure is called for and can be carried out

with the engine installed in the model.

The process is as follows.

1.

Re-start and adjust the needle-valve so that

the engine just breaks into "two-cycle" from

"four-cycle" operation, then make three or four

flights, avoiding successive "nose-up" flights.

3.

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