O.S. Engines 21RZ-V01B User Manual

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 vehicle, radio control equipment, etc., are accessible for checking at the same time.

CONTENTS

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

INTRODUCTION, BASIC ENGINE PARTS INSTALLATION AIR CLEANER GLOWPLUG TOOLS, ACCESSORIES, etc. CARBURETOR CONTROLS

STARTING THE ENGINE & RUNNING-IN('Breaking-in)

IF THE ENGINE FAILS TO START ADJUSTMENT

12~13

14~15

CARBURETOR CLEANLINESS

BEFORE STARTING THE ENGINE

CARE AND MAINTENANCE

GUARANTEE THREE VIEW DRAWING EXPLODED VIEW ENGINE PARTS LIST

CARBURETOR EXPLODED VIEW & PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

18~19

20 21

22 23

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

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.

The advice which follows applies basically to ALL MODEL ENGINES and is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect.

WARNINGS

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

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

•

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 an 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.

•

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.

This engine is intended for model cars.

• 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.

Fit an effective silencer (muffler).

• Frequent close exposure to a noisy exhaust (especially in the case of the more powerful highspeed engines) may eventually impair your hearing and such noise is also likely to cause annoyance to others over a wide area.

NOTES

•

The wearing of safety glasses is also strongly recommended.

Take care that the glowplug clip or

• battery leads do not come into contact with rotating parts. Also check that the linkage to the throttle arm is secure.

For their safety, keep all onlookers

• (especially small children) well back (at least 20 feet or 6 meters) when preparing your model for running.

•

To stop the engine, fully retard the throttle stick and trim lever on the trans-mitter, or, in an emergency, cut off the fuel supply by pinching the fuel delivery line from the tank.

•

Warning! Immediately after a glowplugignition engine has been run and is still warm, conditions sometimes exist whereby it is just possible for the engine to abruptly restart if it is rotated over compression WITHOUT the glowplug battery being reconnected.

NOTES

The MAX-21RZ-V01b and MAX-21RZ-V01b(P) are high performance 3.5cc class power units for oneeighth-scale radio-controlled 'off-road' or 'buggy' cars. They have been designed to meet the exacting requirements of the world's most expert drivers. An exhaustive program of research, development and prototype testing has resulted in one of the most powerful production model racing car engines currently available. The MAX-21RZ-V01b has a conventional crankshaft, while the MAX-21RZ-V01b(P) employs a special crankshaft with integral pilot shaft.

Standard accessories

Glow Plug A5 Exhaust Seal Ring Silicone Tubing Dust Caps 3, 16, 18

NOTE: With this engine, 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 normal running temperatures.

Super Air Cleaner 201

NOTE

As delivered, the engine has its carburetor lightly fit into its intake. Secure it changing its angle according to the car chassis.

BASIC ENGINE PARTS

Heatsink Head

Carburetor Type 21B

Crankshaft

SILICONE TUBING AND O-RINGS

Before installing the engine on the chassis:

Connect the intake chamber and the carburetor with

1. the silicone tubing supplied.

(Note: In the event of the silicone tubing requiring replacement, use tubing of 2.5mm i.d. 5.5mm o.d. and 85mm in length.)

2.Fit the exhaust seal ring supplied.

Crankcase

Mounting Lugs

Exhaust Seal Ring

Silicone Tubing

Intake Chamber

INSTALLING THE GLOWPLUG

Fit washer to glowplug and insert carefully into heatsink head, making sure that it is not cross-threaded before tightening firmly.

Glow plug

Washer

ENGINE INSTALLATION

Make sure that the vehicle's engine mounting surfaces are level and in the same plane. Poor installation may cause distortion of the crankcase, bearings, etc., resulting in erratic running and loss of performance. The recommended screws for securing the engine are 3mm or 4-40 steel Allen hexagon socket type. If existing holes in the engine mount do not align perfectly with engine mounting lugs, enlarge them slightly with a needle-file so that screws are in alignment with the mounting holes.

Chassis

Chamfer inside edges of bearers.

INSTALLATION OF THE CARBURETOR

As delivered, the engine has its carburetor lightly fit into its intake boss. Secure it as follows.

Loosen the retainer screw, rotate the

carburetor to its correct position and make sure that it is pressed well down into the intake boss, compressing the rubber gasket, before retightening screw.

Rotate the retainer

2. screw gently until it stops, then tighten a further 90-120˚. Do not overtighten the screw as this will damage the carburetor body.

Rotate the retainer nut gently until it stops.

Tighten a further 90-120˚

AIR CLEANER TYPE 201

This is a heavy-duty wet type air cleaner that has been developed specifically for 3.5cc 'off-road' model car engines. It contains a specially impregnated filter element which more positively prevents highly damaging dust and dirt from being drawn through the carburettor, yet allows engine performance to be maintained for longer periods between element renewals. It is more compact than the standard O.S. HD Air Cleaner and this makes it easier to install within a car body. This air cleaner is also supplied with a newly designed intake elbow that provides more secure attachment to the caburetor.

Intake Elbow

Filter Element

End Plate

Assembly Screw

Center Tube

Element Base

Center Screen

Strap

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