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O.S. engine MAX-21VZ-R Owner's Instruction Manual

Engine max-21vz-r
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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 vehicle, radio control equipment, etc.,
are accessible for checking at the same time.

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Summary of Contents for O.S. engine MAX-21VZ-R

  • Page 1 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.

  • Page 2: Safety Instructions And Warnings About Your O.s. Engine

    SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE 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.
  • Page 3 WARNINGS • • Model engine fuel is poi- Never operate your engine in an en- closed space. Model engines, like sonous. Do not allow it to automobile engines, exhaust deadly come into contact with the eyes or mouth. Always carbon-monoxide. Run your engine store it in a clearly marked only in an open area.
  • Page 4 NOTES • This engine is intended for model cars. • The wearing of safety glasses is also Do not attempt to use it for any other strongly recommended. purpose. • Take care that the glowplug clip or • Mount the engine in your model battery leads do not come into contact securely, following the manufacturers' recommendations, using appropriate...
  • Page 5 NOTES • 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 glowplug- ignition engine has been run and is still warm, conditions sometimes exist whereby it is just possible for the engine...

  • Page 6: Basic Engine Parts

    The MAX-21VZ-R is high performance 3.5cc BASIC ENGINE PARTS class power unit for one-eighth-scale radio- Heatsink Head controlled 'Track racing' cars. It has been de- signed to meet the exacting requirements of the world's most expert drivers. An exhaustive Carburetor...

  • Page 7: Installation Of The Carburetor

    Insert carefully into heatsink head, making ENGINE INSTALLATION sure that it is not cross-threaded before Make sure that the vehicle's engine mounting tightening firmly. surfaces are level and in the same plane. Poor 2. Install the exhaust seal ring supplied. installation may cause distortion of the crankcase, bearings, etc., resulting in erratic INSTALLATION OF THE CARBURETOR...
  • Page 8 • Install a plug suitable for the engine. GLOWPLUG • Use fuel containing a moderate percentage of Since the compatibility of glowplug and fuel may have nitromethane unless more is essential for racing a marked effect on performance and reliability, it may events.

  • Page 9: Tools, Accessories, Etc

    Model engine fuel also highly TOOLS, ACCESSORIES, etc. flammable. Keep it away from open flame, The following items are necessary for operating the excessive heat, sources of sparks, or engine. anything else which might ignite it. Do not FUEL smoke or allow anyone else to smoke, Generally, it is suggested that the user selects a fuel near to it.

  • Page 10: Carburetor Controls

    • LONG SOCKET WRENCH The Metering Needle: Recommended for easy removal For adjusting the mixture strength at part-throttle and replacement of the angled and idling speeds, to obtain steady idling and smooth acceleration to mid speeds. and recessed glowplug, the O.S.Long Socket Wrench...

  • Page 11: Starting The Engine & Running-In ('Breaking-In')

    Now connect glowplug battery lead to heat the plug needs to be 'run-in' or 'broken-in'. With care, running- filament and start the engine. in of the MAX-21VZ-R can be carried out with it installed in the vehicle. Be sure to install the air- Needle Valve cleaner on the carburetor and to use a muffler- 0.5mm...
  • Page 12 • When the engine starts, first allow it to operate in The position of the needle-valve when starting the engine. short runs at the very rich starting settings, with the Needle glowplug battery still connected and the driving wheels clear of the ground. Close the needle-valve approx.

  • Page 13: If The Engine Fails To Start

    IF THE ENGINE FAILS TO START FINAL ADJUSTMENT Check the following: Run the vehicle (with throttle fully open) over the Glowplug battery discharged or glowplug defunct. longest available straight course, in order to observe the model's speed. Next return the car to the starting Fuel not reaching carburetor.
  • Page 14 Warning! With the engine running, close the throttle and Mixture adjustments (whether via the Metering allow it to idle for about five seconds, then reopen Needle, or the Needle-Valve) cannot be made the throttle fully. accurately under 'no-load' conditions, which, in If, at this point, the engine puffs out an excessive any case, are not advised, since such operation amount of smoke and the vehicle does not...

  • Page 15: Carburetor Cleanliness

    CARBURETOR CLEANLINESS Ball Link Carburetor Body The correct functioning of the carburetor depends on Metering Needle its small fuel orifices remaining clear. (See Care and Maintenance section on Page17.) First rotate Metering Needle until its slotted head is REALIGNMENT OF METERING NEEDLE AND flush with the carburetor body.

  • Page 16: Before Starting The Engine

    Warning! BEFORE STARTING THE ENGINE Do not attempt to turn the engine with the starter Before starting the engine for the first run of the day, if the engine is over-primed (flooded) with fuel. remove the glowplug and check the engine by To do so is likely to seriously damage the engine.
  • Page 17 inside the engine. Repeat this procedure until the GUARANTEE engine fails to fire. Do this while the engine is still warm. This engine is constructed from the very best materials available and to the very highest 4. Then, inject some after-run oil into the engine, and engineering standards, using the most advanced rotate the engine with an electric starter for 4 to 5 precision machinery.

  • Page 18: Engine Exploded View

    ENGINE EXPLODED VIEW C.M3X16 C.M2.6X7 C.M2.6X18 Type of screw C Cap Screw M Oval Fillister-Head Screw F Flat Head Screw N Round Head Screw S Set Screw...

  • Page 19: Engine Parts List

    ENGINE PARTS LIST Code No. Description 23754600 Heatsink Head Assembly 1 -1 23754620 Outer Head 1 -2 23754610 Inner Head 23753000 Cylinder & Piston Assembly 23906000 Piston Pin 23817000 Piston Pin Retainer(2pcs.) Connecting Rod 23755000 23781000 Carburetor Complete (Type 20K) 23715000 Carburetor Sealing Gasket 23818190...

  • Page 20: Carburetor Exploded View & Parts List

    CARBURETOR EXPLODED VIEW & PARTS LIST Code No. Description 23781600 Mixture Control Valve Assembly 1 -1 46066319 "O" Ring(L) (2pcs.) 1 -2 22781800 "O" Ring(S) (2pcs.) 23618190 Needle Valve Assembly 2 -1 23618197 Needle 2 -2 46066319 "O" Ring 2 -3 23618194 Needle Holder Assembly 2 -4...

  • Page 21: Genuine Parts & Accessories

    O.S. GENUINE PARTS & ACCESSORIES RACING ENGINE PARTS T-2040 TUNED SILENCER T-2040 EXHAUST HEADER PIPE T-2040 TUNED SILENCER (72106140) (72106040) ASSEMBLY ASSEMBLY COMPLETE SET (72106050) • • • T-2040 Exhaust Header Pipe T-2040 Tuned Silencer Body (72106141) Tuned Silencer Assembly (72106043) •...

  • Page 22: Three View Drawing

    THREE VIEW DRAWING SPECIFICATIONS Displacement 3.46 cc(0.211cu.in.) Bore 16.6 mm(0.654in.) Stroke 16.0 mm(0.630in.) Practical R.P.M. 3,000-42,000 r.p.m. Power output 2.5 bhp / 34,000 r.p.m. 4- 3.3 Weight 315.5g(11.14oz.) UNF / -28 JAPAN 30.8 29.6 43.9 Dimensions(mm)
  • Page 23 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL : http://www.os-engines.co.jp Copyright 2001 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 120100...

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