O.S. Engines 91HZ-R User Manual
It is of vital importance, before attempting to operate
your eng ine, to read the gene ral 'SA FETY
INSTRUCTIONS AND WARNINGS' section on
pages 2-5 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 model, radio control equipment, etc., are
accessible for checking at the same time.
Integrated with O.S. fuel regulator system.
1
2-5
6-7
8-9
10
13-16
30-34
35
42-43
44-45
46
29
17-18
36-37
38-41
11-12
25-28
47
48
CONTENTS
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
NOTES ON INSTALLING COOLING-FAN ANDCLUTCH
NOTES WHEN APPLYING AN ELECTRIC STARTER,
INSTALLATION OF THROTTLE SERVO
NOTES ON HEATING THE GLOW PLUG
INTRODUCTION, ENGINE PARTS NAME
BEFORE STARTING,
INSTALLATION OF THE ENGINE
INSTALLATION OF THE
STANDARDACCESSORIES
ABOUT THE REGURETOR ,
ABOUT THE PLUMBING
GLOWPLUGS, CARBURETOR CONTROLS
STARTING
RUNNING-IN ("Breaking-in")
ADJUSTMENT
ADJUSTMENT CHART
CARE AND MAINTENANCE
TROUBLE SHOOTING
ENGINE EXPLODED VIEW & PARTS LIST
CARBURETOR EXPLODED VIEW & PARTS LIST
O.S. GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
MEMO
19-21
22-24
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2
Remember that your engine is not a "toy", but a highly efficient internalcombustion 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.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
The advice which follows is grouped under two headings according to the
degree of damage or danger which might arise through misuse or neglect.
WARNINGS
NOTES
Th e se co v er ev e nts wh ich
mig h t inv o l ve se r ious (in
extreme circumstances, even
fatal) injury.
These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.
3
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WARNINGS
•
•
•
•
•
Never touch, or allow any
object to come into contact
with, the rotating parts.
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 flam e,
excessive heat, sources of
sparks, or anything else which
might ignite it. Do not smoke
or allow anyone else to smoke,
near to it.
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.
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an
open area.
!
4
NOTES
•
•
•
•
•
This engine was d es ig ned for model
helicopters. 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.
Install an effective silencer (muffler). Frequent
close exposure to a noisy exhaust (especially
in the case of the more powerful high-speed
engines) may eventually impair your hearing
and such noise is also likel y t o c ause
annoyance to others over a wide area.
Check the linkage to the throttle arm before
each flight.
Avoid sudden high r.p.m. immediately after the
engine is started, as the clutch will engage and
you may be struck by the rotor.
•
•
After starting the engine, carry out any needlevalve readjustments after stopping the rotor by
closing the throttle to the lowest r.p.m..
Stop the engine before attempting to make
other adjustments to the carburetor.
Use an electric starter. The wearing of safety
glasses is also strongly recommended.
Press the rotor head down securely.
Take care that the glow plug clip or battery
leads do not come into contact with rotating
parts.
Adjust the throttle linkage so that the engine
stops when the throttle stick and trim lever on
the transmitter are fully retarded. Alternatively,
the engine may be stopped by cutting off the
fuel supply. Never try to stop the engine
physically.
•
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5
!
NOTES
•
•
•
Take care that loose clothing (ties, shirt sleeves,
scarves etc.) do not come into contact with the
rotor. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from
where they could fall through the rotor disc.
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.
Hold the rotor securely and keep well clear of
spectators.
Warning! lmmediately after a glowplug-ignition
engine has been run and is still warm,
conditions sometimes exist whereby it is just
possible for the engine to restart when turned
over WITHOUT the glowplug battery being
reconnected. Remember this if you wish to
avoid the risk of accidents.
6
Notes on installing cooling fan and clutch
Do not use a tool which locks piston
when installing a cooling-fan and
clutch, or top of the piston may be
damaged. Also, do not insert a
screw driver or the similar into the
exhaust port.
It is recommended to use Crankshaft
Clamp 91 (Code No.71530510) available
as an optional tool.
7
Notes on installing cooling fan and clutch
Do not grip the engine mounting
beams with a vise, or the crankcase
will be distorted which will result in
engine breaking.
Vise
Beam Mount
8
NOTES WHEN APPLYING AN ELECTRIC STARTER
Because of the initial tightness, of the
piston/sleeve assembly a standard
electric starter may have difficulty in
rotating the engine when cold, before
it has been adequately run-in. In this
case, use a high-torque type starter.
Do not over-prime. This could cause a
hydraulic lock and damage the engine
on application of the electric starter.
If over-primed, remove glowplug, close
needle-valve and apply starter to pump
out surplus fuel. Cover the head with a
rag to prevent pumped out fuel from
getting into your eyes.
9
F
J
J
F
28
34
27
33
A
B
90°
90
°
A=B
Linking the throttle servo to the carburetor
Link the throttle servo to the carburetor using the throttle lever supplied.
Throttle control rod A and B should be equal length. Set the linkage so that
the servo output lever and throttle lever are parallel when the throttle stick on
the transmitter is at middle position. Installing hole intervals on the F lever and
on the J lever are different. Decide the lever to use according to the servo used.
Be sure to cut off the unused lever to avoid any interference.
10
Note on heating the glow plug
Example
The heatsink head on the engine is
treated with an anodized finish which
does not conduct current. Therefore,
when heating the glow plug, connect
one lead to the glow plug and the
other to the head or cover plate
retaining screw.
11
INTRODUCTION
Standard accessories
Glow Plug No.8
Needle Adjusting Screw
(M2.6x5 2pcs.)
Check Valve
Head Gasket (0.2mm)
The MAX-91HZ-R has been developed based on
the 91HZ designed expressly for 90 size
helicopter models, and equipped with the new
O.S. regulator system.
The regulator system ensures an always steady
fuel supply which is required for 3D flights which
require repeated vigorous attitude changes as
well as for F3C flights which require severe
mixture control. With this system, the fuel tank is
pressurized by pressure generated in the
crankcase. The fuel sent by pressure is regulated
by the regulator installed just ahead of the
carburetor, then sent into the engine.
The 61E-R carburetor is equipped with twin
needles which enable adjustment of the idling /
hovering and high speed mixture independently.
The cover plate has a cell to accept a sensor
designed to install in the cover plate from the
Futaba GY-701 Governor.
As delivered, the engine has the
carburetor lightly fit into the intake.
Secure it changing the angle according
to the model.
NOTE
12
ENGINE PARTS NAME
Heatsink Head
Carburetor
Typr 61E-R
Crankshaft
Propeller nut
Crankcase
Glowplug
Beam Mount
Reguretor
High Speed
Needle Valve
Fuel Inlet
Mixture Control Valve
Throttle Lever
Idle Mixture Control Screw
Mixture Control
Valve Stopper
Thrust Washer
Carburetor Rubber Gasket
Medium Speed
Needle Valve
Thermo Insulater
Cover Plate
13
Items necessary for starting
Tools, accessories, etc.The following items are
necessary for operating the engine.
BEFORE STARTING
Glow Plug
O.S. No.8 is supplied with the engine.
Battery leads
Glowplug battery
The power source for heating the glowplug may be
either a large heavy-duty 1.5volt dry cell, Ni-cd battery
or glowplug Igniter.
1.5 volt dry cell
These are used to conduct current
from the batter y to the glowplug.
Basically, two leads, with clips, are
required, but, for greater convenience, tw in lea ds with special
glowplug connectors, as shown on
the right, are commercially available.
Battery leads
glowplug Igniter
Make sure glowplug element
glows bright red inside room
or shadow.
Battery leads
In case of 1.5volt dry cell
12V Battery
Starter
Electric starter and starter
battery
An electric starter is recommended for starting.
Hexagon starting shaft
This shaft mounte d on an
electric starting motor is driven
into the shaft cup to turn the
engine.
14
Select, by practical tests, the most suitable fuel from among
the best quality fuels available in your country for helicopter
use. For the best throttle response, a fuel containing 10% to
30% nitromethane is preferable. Lubricants may be either
castor-oil or a suitable synthetic oil (or . a blend of both)
provided that they are always of top quality. For consistent
performance and long engine life, it is essential to use fuel
containing AT LEAST 18% lubricant by
volume. Some fuels containing coloring
additives tend to deterriorate and may
adversely affect running qualities. If in
doubt compare to a fuel known to be good.
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.
Reminder!
Fuel
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 to it.
Alternatively, one of the purpose-made
manual or electric fuel pumps may be
used to transfer fuel directly from your
fuel container to the fuel tank.
Manual
Electric
Install a filter to the outlet tube of your
refueling container to prevent entry of
foreign matter into fuel tank. O.S. ‘Super
Filters’ (large and small) are available as
optional extras.
O.S. Super Filter (Fuel Can Filter)
Fuel Filter
Heatproof silicone tubing of approx.
5-5.5mm o.d. and 2.5mm i.d. is
required for the connection between
the fuel tank and engine.
Fuel Pump
Silicone Fuel Line
It is recommended to install a good inline filter between the fuel tank and
carburetor to prevent entry of foreign
matter from getting into the carburetor.
15
TOOLS
Screwdriver
Necessary for engine installation.
1.5mm, 2mm, 2.5mm, 3mm
Necessary for carburetor adjustments.
No.1, No.2, etc
Phillips Screwdriver
No.1, No.2, etc.
Socket Drivers
5mm, 5.5mm, 7mm
Hex Drivers
8mm
Recommended for easy removal and replacement of
the angled and recessed glowplug, the O.S.Long
Socket Wrench incorporates a special grip.
End Wrenches
8mm, 13mm, 14mm, etc.
Needle Nose Pliers
Long Socket Wrench With Plug Grip
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