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O.S. engine MAX-91SZ-Hring User Manual

O.S. engine MAX-91SZ-Hring
22 pages
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It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY 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.
1
CONTENTS
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
NOTES ON INSTALLING,
COOLING-FAN AND CLUTCH
NOTES WHEN APPLYING AN ELECTRIC STARTER,
NOTES ON HEATING THE GLOW PLUG
INTRODUCTION, BEFORE STARTING
ENGINE PARTS NAME, INSTALLATION
OF THE STANDARD ACCESSORIES
INSTALLATION OF THE ENGINE,
FACTS ABOUT GLOWPLUGS
CARBURETOR CONTROLS
STARTING, RUNNING-IN ("Breaking-in")
2-5
6
13-15
18-19
22-26
27
29
39
ADJUSTMENT
ADJUSTMENT CHART
INSTALLATION OF THROTTLE SERVO
CARE AND MAINTENANCE
TROUBLE SHOOTING
ENGINE EXPLODED VIEW & PARTS LIST
CARBURETOR EXPLODED VIEW & PARTS LIST
O.S. GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
MEMO
34-35
7-8
9-12
20-22
38
16-17
28
30-33
36-37
40

Table of Contents

Questions and Answers:

O.S. engine MAX-91SZ-Hring Specifications

General IconGeneral
Displacement14.95 cc
Bore27.7 mm
Stroke24.8 mm
Fuel TypeGlow fuel
Ignition TypeGlow
Glow PlugO.S. #8
Practical RPM2, 000 - 16, 000 RPM

Summary

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

WARNINGS

Covers events that might involve serious (even fatal) injury.

NOTES

Covers less obvious dangers that may cause damage or injury.

Notes on installing cooling-fan and clutch

NOTES WHEN APPLYING AN ELECTRIC STARTER

BEFORE STARTING

Note on heating the glow plug

INTRODUCTION

FACTS ABOUT GLOWPLUGS

Fuel

Fuel Pump

Alternative for transferring fuel directly from container to tank.

O.S. Super Filter (Fuel Can Filter)

Filter for refueling container outlet to prevent foreign matter entry.

Fuel Filter

Recommended inline filter between fuel tank and carburetor.

Silicone Fuel Line

Heatproof tubing required for connection between fuel tank and engine.

TOOLS

Hex Wrench

Necessary for engine installation, various sizes.

Phillips Screwdriver

Required for carburetor adjustments.

Screwdriver

Necessary for carburetor adjustments.

Socket Wrenches

Various sizes for engine installation and adjustments.

Long Socket Wrench With Plug Grip

For easy removal/replacement of angled glowplugs.

End Wrenches

Various sizes for adjustments and assembly.

Needle Nose Pliers

Useful tool for gripping small parts.

ENGINE PARTS NAME

INSTALLATION OF THE STANDARD ACCESSORIES

INSTALLATION OF THE CARBURETOR

Steps for installing the carburetor and its retainer.

INSTALLING THE GLOWPLUG

Procedure for installing the glowplug correctly.

ABOUT THE HEAD GASKET

Information on adjusting head gasket thickness.

ABOUT THE WOODRUFF KEY

Guidance on using the woodruff key for fan pulley.

INSTALLATION OF THE ENGINE

When to replace the glowplug

CARBURETOR CONTROLS

A The High-Speed (Main) Needle Valve

Sets basic fuel/air mixture strength at full throttle.

B The Idle Mixture Control Screw

Manually adjusts the mixture control valve for idling.

C The Medium Speed Needle Valve

Fine-tunes mixture strength for hovering mode.

BASIC POSITION OF MIXTURE CONTROL SCREW

GRADUATIONS ON THE CARBURETOR BODY

Explains the graduation marks on the carburetor for throttle opening.

STARTING

1. Opening and closing of the Needle-Valve

Instructions on how to operate the needle valve.

2. High Speed needle-valve

Initial setting for the high-speed needle valve.

Idle Mixture Control Screw

Initial setting for the idle mixture control screw.

Medium Speed needle-valve

Initial setting for the medium-speed needle valve.

3. Preparation of the starter

Correct installation of the starting shaft to the starter.

4. Checking the rotating direction of the starter

Ensuring the starter rotates in the correct direction.

5. Inserting the starter shaft

Proper insertion of the starting shaft into the shaft cup.

6. Priming

Procedure for priming the engine before starting.

7. Preparation of starting

Checks before initiating the starting sequence.

8. Starting

Step-by-step instructions for starting the engine.

9. Stopping the engine

Methods for safely stopping the engine.

RUNNING-IN ("Breaking-in")

ADJUSTMENT

High-Speed Needle Valve

Guidance on adjusting the high-speed needle valve.

Medium-Speed Needle Valve

Guidance on adjusting the medium-speed needle valve.

Idle Mixture Control Screw

Guidance on adjusting the idle mixture control screw.

ADJUSTMENT PROCEDURE

SUBSEQUENT READJUSTMENTS

CARBURETOR CLEANLINESS

ADJUSTING CHART

INSTALLATION OF THROTTLE SERVO

CARE AND MAINTENANCE

TROUBLE SHOOTING

Engine fails to fire.

Corrective actions for when the engine does not start.

Engine fires intermittently but does not run.

Corrective actions for intermittent engine operation.

Unstable idle

Causes and solutions for an unstable idle.

Not reaching expected peak r.p.m.

Troubleshooting for failure to achieve maximum engine speed.

Poor response

Corrective actions for sluggish engine response.

Poor r.p.m. drop

Troubleshooting for sudden engine speed reduction.

ENGINE EXPLODED VIEW

ENGINE PARTS LIST

CARBURETOR EXPLODED VIEW

CARBURETOR PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

THREE VIEW DRAWING

SPECIFICATIONS

MEMO

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