O.S. Engines 18CV-RX - Manual (Page 9)

16
approx 0.3-0.5mm
The following procedure is suitable for these engines
when the O.S. T-1030 tuned silencer and a fuel
containing up to 30% nitromethane are used.
Use the same fuel as is to be employed for all initial
running and containing NOT LESS THAN 18%
lubricant.
Temporarily remove the glowplug to check that it
glows bright red when energized.
Open the Needle-Valve 2 turns from the fully closed
position.
Re-check the needle-valve
and throttle settings. Turn
the needle-valve clockwise
slowly and gently until it
stops. This is the fully
closed position.Do not use
force to turn the needle-valve beyond this point.
Open
Close
Needle Valve
STARTING THE ENGINE & RUNNING-IN ('Breaking-in')
Starter Handle
Push the choke button on
the fuel tank several times
to deliver the fuel to the
carburetor. (Do not over-
prime or the recoil starter
cannot be pulled.)
Pull the starter handle
briskly straight out several
times to start the engine.
In case of the 18CV-RX
Set the throttle-stop screw
so that the minimum
throttle opening (idle
setting) is approximately
0.3-0.5mm.
energize glowplug.
Start the engine using a
starter box, making sure the
engine rotation direction is
correct (counter-clockwise
seen from the crankshaft
end). Be sure to fit an air
cleaner when starting.
17
30˚
When the engine starts, first allow it to operate in short
runs on its very rich starting settings, with the glowplug
battery still connected and with its driving wheels clear
of the ground. The rich mixture will, under these
conditions, provide adequate lubrication and cooling,
indicated by profuse smoke from the exhaust.
Next, disconnect the glowplug battery and try
running the car on the track. If the engine stalls,
open the throttle fractionally, but try to keep the
engine running as rich as possible: if it stops
because of being excessively over-rich, close the
Needle-Valve 30˚ and try again.
Run the car on the track until one tank of fuel has been
consumed, then close the Needle-Valve 30˚ and run
the car for another full tank of fuel.
Repeat this procedure until 5 more tanks of fuel have
been consumed, during which time the throttle may
Needle
The position of the needle-valve
when starting the engine.
Close the needle-valve approx.
30˚ after running the vehicle for
one full tank of fuel.
Repeat this procedure several
times.
30
˚
30
˚
To stop the engine, close the throttle to idling speed,
then shut it off completely with the trim lever on the
transmitter. To cut off the fuel supply, pinch the fuel
delivery tube to the carburetor.
If the engine should need to be disassembled (e.g. for
cleaning or minor parts replacement) it is advisable to
return the Needle-Valve to the original rich, starting
setting and check whether further running-in time is
required before the car is raced again. In the event of
any major working parts(e,g, piston/cylinder liner
assembly) being replaced, the complete running-in
should be repeated.
Remember!
It is vitally important to set the
throttle at the correct position
before attempting to start the
engine. If the engine is allowed to
run with the throttle too far open
under "no load" conditions, it will
rapidly overheat and may be seriously damaged.
Remember! be opened for brief bursts of increased power. If the
engine stops at medium speeds, close the Mixture
Screw 45-90˚.