O.S. engine MAX FXi 46 Owner's Manual

© Copyright 2003 HCAZ3085

MAX FXi 46

OWNER’S INSTRUCTION MANUAL

It is of vital importance, before attempting to
operate your engine, to read the general

“SAFETY INSTRUCTIONS AND WARNINGS”

section on pages 2-6 of this booklet and to
strictly adhere to the advice contained therein.

• Also, please study the entire contents of this
instruction manual, so as to familiarize
yourself with the controls and other features
of the engine.

• Keep these instructions in a safe place so
that you may readily refer to them whenever
necessary.

• It is suggested that any instructions
supplied with the aircraft, radio control
equipment, etc., are accessible for chec king
at the same time.

SAFETY INSTRUCTIONS AND WARNINGS

ABOUT Y OUR O.S . ENGINE ................................3

FEATURES OF FXi SERIES ENGINE ..................7

BEFORE INSTALLING THE ENGINE....................7

BASIC ENGINE PARTS ........................................8

INSTALLATION OF THE ENGINE ........................8

THROTTLE LINKAGE............................................8

MUFFLER..............................................................9

FUEL TANK LOCATION ........................................9

GLOW PLUG ......................................................10

FUEL....................................................................11

PROPELLERS ....................................................12

MIXTURE CONTROLS........................................12

BEFORE STARTING............................................13

STARTING ..........................................................14

RUNNING-IN (Breaking-in)..................................15

NEEDLE VALVE ADJUSTMENT DIAGRAM........17

MIXTURE CONTROL VALVE ADJUSTMENT ....19

REALIGNMENT OF MIXTURE CONTROL VAL VE ..19

SUBSEQUENT STARTING PROCEDURE..........20

SUBSEQUENT READJUSTMENT......................20

CARBURETOR CLEANLINESS..........................21

ENGINE CARE & MAINTENANCE ....................22

O.S. ENGINES LIMITED WARRANTY ..............22

ENGINE EXPLODED VIEW ................................24

ENGINE PARTS LIST..........................................25

CARBURETOR EXPLODED VIEW ....................26

CARBURETOR PARTS LIST ..............................26

CONTENTS

2

Remember that your engine is not a "toy,"
but a highly efficient internal combustion
machine whose power is capable of
harming you, or others, if it is misused.

As owner, you, alone, are responsible for
the safe operation of your engine, so act
with discretion and care at all times.

If at some future date, your O.S. engine is
acquired by another person, we would
respectfully request that these instructions
are also passed on to its new owner.

The advice which follows is grouped under
two headings according to the degree of
damage or danger which might arise
through misuse or neglect.

NOTES!

These cover the many other possibilities,
generally less obvious sources of danger,
but which, under certain circumstances,
may also cause damage or injury.

WARNINGS!

These cover events which might involve
serious (in extreme circumstances, even
fatal) injury.

SAFETY INSTRUCTIONS AND

WARNINGS ABOUT Y OUR O.S. ENGINE

3

NOTES!

• This engine was designed for model
aircraft. Do not attempt to use it for any
other purpose.

• Mount the engine in your model
securely,

following the manufacturers’
recommendations, using appropriate
screws and locknuts.

• Be sure to use the muffler

supplied with
the engine. Frequent exposure to an
open exhaust may eventually impair

• Never operate your engine in an
enclosed space. Model engines, like
automobile engines, exhaust deadly
carbon monoxide.Run your engine only
in an open area.

• Model engines generate considerable
heat. Do not touch any part of your
engine until it

has cooled.Contact with the

muffler

(silencer), cylinder head or
exhaust header pipe, in particular, may
result in a serious burn.

WARNINGS!

• Never touch, or allow any object to
come into contact with, the rotating
propeller and do not crouch over the
engine when it is running.

• A weakened or loose propeller may
disintegrate or be thrown off and, since
propeller tip speeds with powerful
engines

may exceed 600 feet (180 meters)

per

second, it will be understood that

such a failure

could result in serious

injury, (see

“NOTES!” section relating to

propeller safety).

• Model engine fuel is poisonous. Do not
allow it to come into contact with the
eyes or mouth. Always store it in a
clearly marked container and out of the
reach of children.

• Model engine fuel is also highly
flammable. Keep it away from open
flame, excessive heat, sources of
sparks, or anything else which might
ignite it. Do not smoke or allow anyone
else to smoke, near fuel.

4

• If you fit a spinner, make sure that it is a
precision made product and that the
slots for the propeller blades do not cut
into the blade roots and weaken them.

• Preferably, use an electric starter. The
wearing of safety glasses is also
strongly recommended.

• Discard any propeller which has
become split, cracked, nicked or
otherwise rendered unsafe. Never
attempt to repair such a propeller,
destroy it. Do not modify a propeller in
any way, unless you are highly
experienced in tuning propellers for
specialized competition work such as
pylon racing.

• Tak e care that the glow plug clip or battery
leads do not come into contact with the
propeller. Also check the linkage to the
throttle arm. A disconnected linkage could
also foul the propeller.

your hearing.Such noise is also likely to
cause annoyance to others over a
wide area.

• If you remove the glow plug from the
engine and check its condition by
connecting the battery leads to it, do not
hold the plug with bare fingers. Use an
appropriate tool or a folded piece of cloth.

• Install a top-quality propeller of the
diameter and pitch specified for the
engine and aircraft. Locate the propeller
on the shaft so that the curved face of the
blades face f orw ard–i.e.in the direction of
flight. Firmly tighten the propeller nut,
using the correct size wrench.

• Always check the tightness of the
propeller nut and retighten it, if
necessary, before restarting the engine,
particularly in the case of four-stroke
engines. If a safety locknut assembly is
provided with your engine, always use
it. This will prevent the propeller from
flying off in the event of a "backfire",
even if it loosens.

5

Do not start your engine in an area
containing loose gravel or sand. The
propeller may throw such material in
your face and eyes and cause injury.

For their safety, keep all onlookers
(especially small children) well back (at
least 20 feet or 6 meters) when
preparing your model for flight. If you
have to carry the model to the take-off
point with the engine running, be
especially cautious. Keep the propeller
pointed away from you and walk well
clear of spectators.

• Warning! Immediately after a glow plug
ignition engine has been run and is still
warm, conditions sometimes exist
whereby it is just possible f or the engine
to abruptly restart if the propeller is
casually flipped over compression
WITHOUT the glow plug battery being
reconnected. Remember this if you
wish to avoid the risk of a painfully
rapped knuckle!

NOTES!

• Adjust the throttle linkage so that the
engine stops when the throttle stick and
trim lever on the transmitter are fully
retarded. Alter natively, the engine may be
stopped by cutting off the fuel supply.
Never try to stop the engine physically.

• Take care that loose clothing (ties, shirt
sleeves, scarves, etc.) do not come into
contact with the propeller. Do not carr y
loose objects (such as pencils,
screwdrivers, etc.) in a shirt pocket from
where they could fall through the
propeller arc.

• After starting the engine, carr y out any
needle-valve readjustments from a safe
position behind the rotating propeller.
Stop the engine before attempting to
make other adjustments to the
carburetor.

6

This range of engines is ideally suited to a
variety of R/C aircraft, including trainer,
sports, acrobatic and scale types.

A separate precision-made needle-valve
unit is installed at the rear, where manual
adjustment is safely remote from the
rotating propeller.

Common Accessories

No. 8 Glow Plug, Silicone Tube, Instruction
Manual.

Note: With these engines, the piston will
feel tight at the top of its stroke when the
engine is cold. This is normal. The piston
and cylinder are designed to achieve a
perfect running clearance when they
reach their intended running temperature.

Installing the Glow Plug

Carefully insert plug, with washer, finger
tight only, before final tightening with the
correct size plug wrench.

Connecting the Fuel Tubing

Connect the short length of fuel tubing
(supplied) securely between the needle­valv e outlet and carburetor inlet as sho wn in
the illustration on the next page.

In the event of the tubing becoming
damaged, it should be replaced with a
suitable length (as indicated below) of best
quality 5mm OD x 2mm ID silicone tubing.
Use similar material to connect the fuel inlet
nipple to the fuel tank.

BEFORE INSTALLING THE ENGINE

FEATURES OF FXi SERIES ENGINE

7

Installation in the Model

Make sure that the mounting beams are
parallel and that their top surfaces are in the
same plane.

• Before connecting the throttle­lever/servo linkage, make sure that no
part of the linkage interferes with the
internal structure of the aircraft or
wiring, etc., when the throttle is fully
open or fully closed.

• Set the throttle lever linkage so that the
throttle rotor is (a) fully open when the
transmitter throttle stick is fully
advanced and (b) fully closed when the

THROTTLE LINKAGE

INSTALLATION OF THE ENGINEBASIC ENGINE PARTS

8

throttle stick is fully retarded.
Adjustment of the throttle rotor opening
at the idling position can then be made
with the throttle trim lever on the
transmitter. (Select throttle-lever and
servo-horn hole positions that will
avoid excessive pushrod travel causing
the throttle to bind at either end.)

Note: When adjusting the throttle lever
angle, relative to the rotor, hold the rotor
at about half-way between the open and
closed positions while loosening and
tightening the fixing screw, otherwise
the rotor, rotor guide screw, throttle stop
screw or carburetor body may become
burred and damaged.

The exhaust outlet of the silencer can be
rotated to any desired position in the
following manner:

1) Loosen the locknut and assemb ly screw.

2) Set the exhaust outlet at the required

position by rotating the rear part of
the silencer.

3) Re-tighten the assembly screw,

followed by the locknut.

Note: The standard expansion-chamber
type silencer is quite effective, but
reduces power to some degree.

Reminder: Model engines generate

considerable heat. Do not touch any part of
your engine until it has cooled.Contact with
the muffler (silencer), cylinder head or
exhaust header pipe, in particular, may
result in a serious burn.

Keep your hands and face away from
exhaust gas or you will suffer a burn.

Suggested fuel tank capacities are listed
opposite.These will allow 12-13 minute flights.
Locate the fuel tank so that the top of the

FUEL T ANK LOCA TION

MUFFLER

9