O.S. Engines PA-102 Carb - 72502000 - Manual (Page 2)

4. Turn the propeller two extra revolutions to prime the
engine. Do not turn the prop more than this or the
engine will be over-primed.
5. Connect the battery to the glowplug and start the engine.
Note: If the engine is over-primed (i.e. flooded), pinch the
fuel delivery tube (Pipe B) with a suitable clip or
clamp before attempting to start the engine. If the
engine remains over-primed and unwilling to start,
close the needle-valve completely, remove the glow-
plug and flip the propeller briskly to eject excess
fuel from the cylinder via the glowplug hole.
6. Fuel may be observed in Pipe C while the engine is
running. This is quite normal.
7. Check that sufficient fuel can reach the engine to cause
it to run rich (for running-in purposes, etc.) when the
needle-valve is more than 3 turns open. If the engine
cannot be made to run rich, check as follows:
* Make sure that the fuel filter or carburettor is not
partially obstructed with foreign matter.
* Make sure that there are no holes in the piping or air
bubbles in the fuel flow.
* Make sure that the fuel does not "froth" in the tank
when the engine is running. This can occur if the
tank is not properly insulated from vibration.
* Make sure that the fuel pick-up weight is not being
partially obstructed by contact with the tank wall.
(Refer to previous instructions under "FUEL
TANK".)
In the unlikely event that the engine cannot be persu-
aded to run rich, or fuel does not flow through Pipe D,
after checking the above, it is possible that a fault has
developed in the pump. In this case, consult the O.S.
engine distributor in your country.
ADJUSTMENTS
Adjustment of the PA-102 System is confined to the Type
86 carburettor. No adjustments to the pump are called for.
These are factory set. Carburettor adjustment broadly
follows the procedure for setting up a conventional suction-
feed system. See separate instruction leaflet for O.S. Type
86 carburettor.
FUEL FILTERING
As previously noted, it is important to install a fine fuel
filter between the fuel tank and pump. It is also advisable
to filter fuel even before it reaches the tank. The O.S.
Super Filter ' L ' is available for this puspose. It fits inside
your refuelling container.
MAINTENANCE
If, after use, the fuel system is left unattended for a lengthy
period, there will be a tendency for the methanol content
of the fuel to evaporate sufficiently for the oil content to
"gum" the internal parts of the pump. Therefore, it is
advisable, at the end of the day's flying, to empty the fuel
tank, invert the engine, and pump out the remaining fuel in
the system by rotating the propeller until no more fuel is
ejected from the carburettor.
If the pump is not in use for a while (more than one
month), remove the pump and wash out its interior by
injecting methanol or kerosene through the "IN" nipple.
Fit the sealing caps (provided) to the nipples, after draining
out the methanol or kerosene. Note: if you use kerosene,
take care not to allow this to come into contact with the
fuel tubing, otherwise the tubing will swell and deteriorate.
O.S.PUMP SYSTEM
Distributed in the United
States by permission of
Perry Aeromotive, Inc. under
U.S. Patent No. 3,967,606.
6-15 3-chome Imagawa Higashisumiyoshi-ku
Osaka 546, Japan. TEL. (06) 702-0225
FAX. (06) 704-2722
© Copyright 1987 by O.S. Engines Mfg. Co., Ltd. All rights reserved Printed in Japan