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.
CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE IF THE ENGINE FAILS TO START 2 ~5 INTRODUCTION, BASIC ENGINE PARTS 6 INSTALLATION 7 NOTES CONCERING THE RECOIL STARTER 7 ~8 GLOWPLUG 8 ~9 TOOLS, ACCESSORIES, etc. CARBURETTOR CONTROLS STARTING & INITIAL RUNNING-IN('Breaking-in) 13 ADJUSTMENT 13 ~15 CARE AND MAINTENANCE 15 ~16 O.S.
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.
WARNINGS • Never touch, or allow any • Never operate your engine in an en- object to come into contact with, the rotating propeller and do not crouch over the engine when it is running. closed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an open area. • 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.
NOTES • This engine was designed for model boats. • Take care that the glowplug clip or battery Do not attempt to use it for any other purpose. leads do not come into contact with the propeller or any other rotating parts. Also check that the linkage to the throttle arm is secure. • Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts. • If your engine does not have a built-in recoil starter, use an electric starter.
NOTES • Adjust the throttle linkage so that the • If your engine is fitted with a recoil starter, 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. pull the operating handle straight out when starting the engine, so that the cord does not rub against the hull or engine. This will help prevent the cord from being damaged by abrasion or engine heat.
The O.S. MAX-32SX-MX is a high-performance water-cooled marine engine for small radio-controlled boats, especially scale and sport type hulls. The MAX-32SX-MX incorporates a recoil starter system which provides easy, positive starting, while eliminating the need for an electric starter and starter-battery. BASIC ENGINE PARTS Carburettor Type 20C Water Cooled Head Starter Handle Flywheel Assembly NOTE • With this engine, the piston will feel tight at the top of its stroke when the engine is cold.
INSTALLATION 1. Make sure that the engine mounting beams in the hull are parallel, with their top surfaces in the same plane. If they are not, the engine will not rest firmly as the engine mounting faces (undersides of the mounting lugs) are precision machined to be flat and in the same plane. Poor installation may not only cause vibration, erratic running and loss of performance, but may also damage the engine itself by deforming the crankcase, cylinder, etc. Chamfer inside edges of bearers.
◆ Try to avoid spilling fuel over the starter unit and its cord. Some fuels have a detrimental effect on these parts. ◆ The starter prevents the engine from being rotated in the wrong direction. The unit will be damaged if you attempt to force the flywheel in the opposite direction (i.e. clockwise when viewed from the crankshaft end). For higher nitro fuel, a cold rated plug may be required, whereas, for lower nitro fuel, a hot rated plug may be best. However, the O.S. No.
¡ When the brand of fuel is changed, or the nitro content increased, it is advisable to repeat the running-in procedure referred to in the RUNNING-IN paragraphs. For consistent performance and long engine life, it is essential to use a good quality fuel containing NOT LESS THAN 18% lubricant. Please note that with high-nitro fuels, although power may be increased for competition purposes, glowplug elements do not last as long and engine life will be shortened.
PROPELLER LONG SOCKET WRENCH Use well balanced propellers only. As the ideal diameter, pitch and shape vary according to the size, weight and type of model, final selection can be made after practical experiment. As a starting point, suggested propeller diameter is 42-45mm with a pitch/dia ratio of 1.0-1.1 for Vee type hulls. Recommended for easy removal and replacement of the deeply recessed glowplug, the O.S. Long Socket Wrench incorporates a special grip.
■REALIGNMENT OF MIXTURE CONTROL VALVE CARBURETTOR CONTROLS In the course of making carburettor adjustments, it is just possible that the Mixture Control Valve may be inadvertently screwed in or out too far and thereby moved beyond its effective adjustment range. Its basic setting can be reestablished as follows : Two adjustable controls are provided on this carburettor. ● The Needle Valve: When set to produce maximum power at full throttle, this establishes the basic fuel/air mixture strength.
STARTING & INITIAL RUNNING-IN('Breaking-in') For long life and high perfomance, every engine needs to be 'run-in' or 'broken-in'. With care, runningin of the MAX-32SX-MX can be carried out with it installed in the boat. Be sure to use a muffler-pressurized fuel system. ◆ Pull the starter handle briskly straight out several times to start the engine. Starter handle The following procedure is suitable for this engine when the O.S. E-3030 silencer and a fuel containing up to 5~10% nitromethane are used.
◆ Next restart the engine, disconnect the glowplug battery and lower the boat into the water, gradually opening the throttle sufficiently to prevent the engine from stalling as the propeller takes up the load. If the engine stops due to being over-rich, close the needle-valve 30˚ and try again. The position of the needle-valve when starting the engine. IF THE ENGINE FAILS TO START Check the following: ◆ Glowplug battery discharged or glowplug defunct. ◆ Fuel not reaching carburettor. ◆ Engine flooded.
◆ If, on the other hand, the idling mixture is too lean, the engine is likely to speed up momentarily, then cut out abruptly when the throttle is re-opened. In this case, first turn the mixture control screw counter-clockwise 90˚ to make sure that the mixture has become richer, then make incremental adjustments, each way, until an acceptable balance between rich and lean settings is achieved.
✽ O.S. 'Super-Filters' (large and small) are available, as optional extras,to deal with this problem. One of these filters, fitted to the outlet tube inside your refuelling container, will prevent the entry of foreign material into the fuel tank. ◆ When the best balance of mixture adjustments has been determined and, especially as the engine becomes fully run-in, it will probably be found that the idling speed has increased.
4 Drain the water remaining in the water cooling head, and wash out with methanol, then inject corrosion-inhibiting or moisture-displacing oil. O.S. GENUINE PARTS & ACCESSORIES ■ O.S. Glow Plug 5 When cleaning the exterior of the engine, use methanol or kerosene. Do not use gasoline or any solvent that might damage the silicone fuel tubing or any plastic parts of the boat hull. ■ E-3030 Silencer (23325020) No.
THREE VIEW DRAWING 4-φ3.3 15 SPECIFICATIONS 5.23 cc/0.319 cu. in 38 19.5 mm/0.768 in 17.5 mm/0.689 in 2,500~21,000 r.p.m. 1.1 bhp / 17,000 r.p.m. 423g/14.92 oz. 35 18 19 30.5 58 16 15.3 24.5 ■ Displacement ■ Bore ■ Stroke ■ Practical r.p.m.Range ■ Output ■ Weight 30.6 85.7 41.
EXPLODED VIEW C.M2.
ENGINE PARTS LIST 19 No. Code No. Description 1 2 3441 000 1-1 2 4025 923 2 2 3403 000 3 2 3406 000 4 2 3405 000 Water Cooled Head Assembly Nipple No.2 Cylinder & Piston Assembly Piston Pin Connecting Rod Carburettor Complete(Type 20C) Carburettor Rubber Gasket Carburettor Retaining Screw(2pcs.) Universal Joint Assembly(4.0mm) Joint Ball(4.0mm) Flywheel No.
20C CARBURETTOR EXPLODED VIEW & PARTS LIST 1 1-2 1-1 3 4 2 5 5-1 6 7 8 9 9-4 N.+M3.5X5 9-1 9-5 9-2 0 9-3 - ✽ Type of screw C…Cap Screw M…Oval Fillister-Head Screw F…Flat Head Screw N…Round Head Screw S…Set Screw No. Code No.
Q U A LIT Y PRECISION & P ERFO RM AN NC E UN ES LED CE UAL EQ T AB L IS H IN G T H E STA N D A R D S O F EXCE LLE 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 C Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
