MAX-18TZ SERIES OWNER'S INSTRUCTION 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.
CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE......... 2-5 CARE AND MAINTENANCE, CHECKING THE ENGINE................................. 24-25 ENGINE CONSTRUCTION, NOTES WHEN APPLYING AN ELECTRIC STARTER................. 6-7 TROUBLE SHOOTING.............................. 26-29 ENGINES EXPLODED VIEW & PARTS LIST ............................................. 30-37 18TZ SERIES INSTRUCTION........................................ 8 TOOLS, ACCESSORIES, etc .....................................
SAFETY INSTRUCTIONS AND WARNINGS ABOUTYOUR 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 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 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 engines generate considerable heat. Do not touch any part of your engine until it has cooled.
NOTES This engine is intended for model cars. Do not attempt to use it for any other purpose. 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. Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts.
NOTES To stop the engine, fully retard the throttle stick and trim lever on the transmitter, or, in an emergency, cut off the fuel supply by pinching the fuel delivery line from the tank. Pull the operating handle straight out when starting the engine, so that the cord does not rub against the vehicle body or engine. This will help prevent the cord from being damaged by abrasion or engine heat. Do not attempt to disassemble the recoil starter of the 18TZ-TX.
ENGINE CONSTRUCTION With this engine, the piston will feel tight at the top of its stroke (TDC) when the engine is cold. Piston Cylinder Liner This is normal. The cylinder bore has a slight taper. The piston and cylinder are designed to achieve a perfect running clearance when they reach operating temperature. Crankshaft Slight taper When the engine is cold. 6 When the engine is hot.
NOTES WHEN APPLYING AN ELECTRIC 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 coming into your eyes. NOTE As delivered, the engine has the carburetor lightly fit into its intake. Secure it changing its angle according to the car chassis.
Standard accessories MAX-18TZ SERIES INSTRUCTIONS Glow Plug P3 T-type head (Turbo head) 1 piece (Hot Type) This manual handles the following four versions. MAX- 18TZ-T with 11 L carburetor MAX-18TZ(S)-T with 11 L carburetor Exhaust Seal Ring 1 piece MAX-18TZ-TX with 11 L carburetor MAX-18TZ(P)-T with 11 K carburetor About Head Gasket These engines are fitted with two head gaskets of 0.1mm thick and 0.2mm thick.
REMINDER! 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. TOOLS, ACCESSORIES, etc. The following items are necessary for operating the engine. Items necessary for starting FUEL Generally, it is suggested that the user selects a fuel that is commercially available for model two-stroke engines and contains 10-30% nitromethane.
TOOLS STARTER BOX HEX WRENCH Necessary for engine installation. 1.5mm, 2mm, 2.5mm, 3mm For starting the engine. It is not necessary for the recoil starter version. 7.2V BATTERIES FOR STARTER BOX Batteries for starter box. Select according to the starter box used. Be sure to full charge before using. SCREWDRIVER Necessary for carburetor adjustments. No.1, No.
BASIC ENGINE PARTS Heatsink Head Heatsink Head Starter Handle Carburetor Type 11L Exhaust Exhaust Carburetor Type 11K Cover Plate Mounting Lugs Crankcase Crankshaft MAX-18TZ(P)-T Recoil Starter Assembly No.
CARBURETOR CONTROLS (11K) Four adjustable controls are provided on this carburetor. The Needle-Valve: For adjusting the mixture strength when the throttle is fully open. Needle Valve The Mixture Control Valve: For changing the mixture strength at mid speed and acceleration. (Do not rotate the screw more than one turn.) The Metering Needle: For adjusting the mixture strength at partthrottle and idling speeds, to obtain steady idling and smooth acceleration to mid speeds.
CARBURETOR CONTROLS (11L) Three adjustable controls are provided on this carburetor. The Needle-Valve: For adjusting the mixture strength when the throttle is fully open. Needle Valve The Mixture Control Screw: For adjusting the mixture strength at partthrottle and idling speeds, to obtain steady idling and smooth acceleration to mid speeds.
GLOWPLUG Glowplug life Particularly in the case of very high performance engines, glowplugs must be regarded as expendable items. However, plug life can be extended and engine performance maintained by careful use, i.e.: Install a plug suitable for the engine. Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability, it may be worthwhile to choose the R/C type plug found most suitable after tests. Recommended O.S. plugs are P3 and P6.
INSTALLATION OF THE CARBURETOR ENGINE INSTALLATION As delivered, the engine has its carburetor lightly fit into the intake boss. Secure it as follows. 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.
In case of the18TZ-TX NOTES CONCERNING THE RECOIL STARTER Avoid forcing the screws. Secure with locknuts. If the bottom of the recoil starter housing would otherwise touch the car chassis, install the engine mount spacers (optional extra) between the engine's mounting lugs and the engine mount. With some vehicles, it may be necessary to make minor trimming modifications to chassis or body when installing the engine. REMINDER! ( 18TZ-TX ONLY) • Do not attempt to disassemble the recoil starter.
Before starting the engine, always check the tightness of all the screws and nuts especially those of joint and movable parts such as throttle arm. Missing retightening the loose screws and nuts often causes the parts breakage that is capable of harming you.
In case of the 11 K carburetor Element glows when energized, Set the throttle-stop screw so that the minimum throttle opening (idle setting) is approximately 0.3-0.5mm. Pliers Replace the plug when the element does not glow or is burnt out. In case of the 11 L carburetor Glow Plug Igniter Set the throttle-stop screw so that the minimum throttle opening (idle setting) is approximately 1.0mm. Turn the needle-valve clockwise slowly until it stops. This is the fully closed position.
Switch on the transmitter and make sure that each linkage moves correctly. Turn the engine with starter box to draw the fuel into the engine. Attention: It is vitally important to set the throttle at the correct position before starting the engine. If the engine is allowed to run with the throttle too far open under "no load" conditions (i.e. with the driving wheels not in contact with the ground) it will rapidly over-heat and may be seriously damaged. Deliver fuel into the carburetor.
time is required before the car is raced again. In the event of any major working parts (e.g. piston/cylinder liner assembly) being replaced or the fuel being changed, especially to high nitro fuel, the complete running-in should be repeated. Run the car on the track until one tank of fuel has been consumed, then close the NeedleValve 30° and run the car for another full tank of fuel.
FINAL ADJUSTMENT • Run the vehicle (with throttle fully open) over With the engine running, close the throttle and allow it to idle for about five seconds, then reopen the throttle fully. If, at this point, the engine puffs out an excessive amount of smoke and the vehicle does not accelerate smoothly and rapidly, it is probable that the idling mixture is too rich, the longest available straight course, in order to observe the model's speed.
Carry out adjustments patiently, under actual running conditions, until the engine responds quickly and positively to the throttle control. If the engine runs too fast with the throttle closed, the throttle stop screw should be turned counter-clockwise to allow the throttle opening to be reduced.
In case of the 11 L carburetor The basic positions can be found by rotating the Metering Needle until its slotted head is flush with the ball link body. In case of the 11K carburetor Carburetor Body Throttle Lever Ball Link Rotate the Metering Needle until its slotted head is flush with the ball link body. This is the standard position. Rotate the Mixture Control Valve until its slotted head is flush with the ball link body. This is the standard position.
CARE AND MAINTENANCE 1.The minute particles of foreign matter, that are present in any fuel may, by accumulating and partially obstructing fuel flow, cause engine performance to become erratic and unreliable. O.S. 'Super-Filters' (large and small) are available, as optional extras, to deal with this problem. One of these filters installed to the pickup tube inside your refueling container, will prevent the entry of foreign material into the fuel tank.
Installing Dust Caps When storing the engine, install the cap on the exhaust port, carburetor, etc. to prevent dust from entering the engine. Dirt and dust may lodge in CHECKING THE ENGINE Engine will not develop normal performance after long time running due to wearing of parts. It is suggested to replace necessary parts when the following symptoms are detected. marked places. Engine sound changes and easily overheats. Power has dropped extremely.
TROUBLE SHOOTING Engine fails to fire. Fuel tank is empty. Fuel not reaching the engine. Fill the tank with fuel and repeat Priming procedure. Glowplug element is burnt out. Glowplug battery discharged Clogged fuel filter Air cleaner and silencer inside is dirty. Replace glowplug. Recharge or replace the battery. Clean or replace fuel filter. Replace cleaner element and clean inside silencer. Over priming Remove glowplug and pump excess fuel. Fuel tubing is disconnected.
Engine fires intermittently but does not run. Insufficient fuel in the tank. Fill the tank with fuel. Deteriorated glowplug Replace glowplug. Clogged fuel filter Air cleaner and silencer inside is dirty. Clean or replace fuel filter. Replace cleaner element and clean inside silencer. Engine overheated Wait until engine is cooled. Incorrect clutch release Adjust the tension of clutch spring. Too immediately disconnecting plug battery. Do not disconnect plug battery and wait until r.p.
Unstable idle Unsuitable glowplug Use suggested glowplug in the instructions. Unsuitable fuel Do not use extremely high nitro or low oil fuel. Extremely light flywheel Add suitable load. Silencer is disconnected or has play Install silencer securely. Not reaching expected peak r.p.m. Insufficient warming up or running-in. Set the needle only after warming up. Complete running-in. Silencer or manifold is not securely connected or disconnected. Replace seal ring.
Poor response Deteriorated glowplug Replace glowplug. Incorrect carburetor settings Readjust low r.p.m, range with metering needle and mixture control valve. Incorrect setting of transmitter Exponential function. Check the transmitter setting. Make sure that throttle servo does not interfere servo linkage. Incorrect linkage Poor r.p.m, drop Too much throttle opening at idle. Close metering needle to adequate position to lower idle r.p.m. Incorrect carburetor fitting Fit carburetor securely.
8 9 5 1 2 C.M3X16 7 4 10 11 12 14 C.M2.6X7 13 15 C...Cap Screw M...0val Fillister-Head Screw F...FIat Head Screw N...Round Head Screw S...
The specifications are subject to alteration for improvement without notice.
9 10 11 8 5 1 2 C.M3X16 7 4 12 6 14 15 16 C.M2.6X7 17 Type of screw C...Cap Screw M...0val Fillister-Head Screw F...FIat Head Screw N...Round Head Screw S...
21914010 21914110 21913010 21816000 21817000 21915000 21884010 25381701 20810007 21458000 23731000 21911010 21931000 21912020 21824000 21917000 23763000 71641300 21427200 Cover Plate Screw Set Glow Plug P3 Exhaust Seal Ring Gasket Set Crankshaft Ball Bearing (Rear) Crankshaft Crankcase Outer Head Inner Head Cylinder & Piston Assembly Piston Pin Piston Pin Retainer (2pcs.
9 10 8 5 1 2 C.M3X16 7 4 11 6 13 14 15 C.M2.6x7 16 C...Cap Screw M...0val Fillister-Head Screw F...FIat Head Screw N...Round Head Screw S...
21914010 21914110 21913010 21816000 21817000 21915000 21884010 25381701 20810007 23731000 21911010 21931000 21912030 21824000 21917000 23763000 71641300 21427200 Inner Head Cylinder & Piston Assembly Piston Pin Piston Pin Retainer (2pcs.
9 10 11 8 5 1 2 C.M3X16 7 4 12 17 13 14 M.+M2.6X7 18-2 18 19 18-1 M.+M2.6X7 15 C...Cap Screw M...0val Fillister-Head Screw F...FIat Head Screw N...Round Head Screw S...
21914010 21914110 21913010 21816000 21817000 21915000 21884010 25381701 20810007 21458000 23731000 21911010 21931000 21912040 21824000 21922000 21901800 73008000 73008100 73008200 21923000 71641300 21427200 Glow Plug P3 Exhaust Seal Ring Screw Set Starting Shaft Rear Adaptor No.N1 Recoil Starter Assembly No.N1 Recoil Starter Body No.N1 One-way Clutch Gasket Set Inner Head Cylinder & Piston Assembly Piston Pin Piston Pin Retainer (2pcs.
UK CARBURETOR EXPLODED VIEW 2-1 2 2-2 3 3-1 4 1-1 6 5 1-2 6-1 1 7 9 S.M3x3 10 * Type of screw 8 C...Cap Screw M...0val Fillister-Head Screw F... Flat Head Screw N...Round Head Screw S...
UK CARBURETOR PARTS LIST 1 1-1 1-2 2 2-1 2-2 3 3-1 4 5 6 6-1 7 8 9 10 21982600 27881820 22781800 21285901 27881820 21881950 21982620 22781800 21982100 21982200 21982540 22781800 21982520 23818430 21982900 22615000 Mixture Control Valve Assembly "0" Rinq(L) (2pcs.) "0" Rinq(S) (2pcs.) Needle Valve Assembly "0" Ring (2pcs.) No.14 Universal Nipple Assembly Throttle Stop Screw "0" Ring(S) (2pcs.) Carburetor Body (w/Thermo Insulator) Slide Valve Metering Needle Assembly "0" Rinq(S) (2pcs.
11L CARBURETOR EXPLODED VIEW 1-1 1 1-2 3 4 5 2 6 7 9 10 9-1 11 * Type of screw 8 C...Cap Screw M...0val Fillister-Head Screw F...FIat Head Screw N...Round Head Screw S...
11L CARBURETOR PARTS LIST 1 1-1 1-2 2 3 4 5 6 7 8 9 9-1 10 11 21285901 27881820 21881950 22681310 21884110 22481506 21884200 21283210 22681419 21481420 21982630 27881820 21165010 22615000 Needle Valve Assembly "0" Ring (2pcs.) No.14 Universal Nipple Assembly Throttle Stop Screw Carburetor Body (w/Thermo Insulator) Rotor Spring Carburetor Rotor Dust Cover Throttle Lever Throttle Lever Fixing Nut Mixture Control Screw "0" Ring (2pcs.
O.S. GENUINE PARTS & ACCESSORIES RACING ENGINE PARTS O.S.
O.S. GENUINE PARTS & ACCESSORIES RACING ENGINE PARTS Super Air Cleaner 202 SUPER AIR CLEANER 203 Engine Mount Spacer (72412000) (72413000) (72404000) • 202 Cleaner Body (72412100) 203 Filter Element (4pcs.) (72413200) Cap Screw Set • 202 Filter Element (4pcs.) M2.6x7 (10pcs.) (72412200) Dust Cap Set 3mm (5pcs.) (73300305) 8mm (3pcs.) (73300812) (79871020) Long Socket Wrench With Plug Grip (71521000) 16mm (3pcs.) (73301612) 18mm (3pcs.
18TZ(P)-T THREE VIEW DRAWING SPECIFICATIONS Displacement Bore Stroke Practical R.P.M. Power output Weight 3.0cc(0.183cu.in.) 16.0mm (0.629 in.) 15.0mm (0.590 in.) 3,000-34,000 r.p.m. 1.8 ps/29,000 r.p.m. 225.8g (7.96oz.
18TZ-T THREE VIEW DRAWING Displacement Bore Stroke Practical R.P.M. Power output Weight 3.0 cc (0.183cu.in.) 16.0mm (0.629 in.) 15.0mm (0.590 in.) 3,000-34,000 r.p.m. 1.8 ps / 29,000 r.p.m. 224.8g (7.930Z.
18TZ(S)-T THREE VIEW DRAWING Displacement Bore Stroke Practical R.P.M. Power output Weight 3.0 cc (0.183 cu.in.) 16.0mm (0.629 in.) 15.0mm (0.590 in.) 3,000-34,000 r.p.m. 1.8 ps/29,000 r.p.m. 222.4g (7.84oz.
18TZ-TX THREE VIEW DRAWING SPECIFICATIONS Displacement 3.0cc (0.183cu.in.) Bore 16.0mm (0.629 in.) Stroke 15.0mm (0.590 in.) Practical R.P.M. 3,000-34,000 r.p.m. Power output 1.8 ps/29,000 r.p.m. Weight 263.7g (9.30oz.
MEMO 48
GUARANTEED TO KEEP IT RICH The high-speed needle valve is used to adjust the mixture of fuel and air needed to get the optimum performance from your engine. If it's adjusted too lean, your engine will get less fuel than it should. •You must remember that the engine gets its lubrication from the oil that's in the fuel. If you run it too lean, the engine will not get enough oil to keep the internal parts lubricated, even thought it sounds better. •Parts will start to run hot and then seize.
KEEP IT COOL KEEP IT PROPERLY If you run your engine good and hot, you'll have a nice chunk of useless aluminum in a short time. •Running the engine hot causes the oil in the fuel to break down and quit working. The repairs won't be cheap. Your engine is equipped with a special heat-sink cylinder head to make sure it gets enough cooling.. •Keep the head clean so that the dirt doesn't act like an insulating blanket. •Make sure that any airflow passes through the fins of the cylinder and head.
GUARANTEED TO KEEP GOOD POWER Nitro, or Nitromethane, is the main power ingredient in model fuels. Raising the nitro content will make the fuel "hotter"— that is, allow the engine to develop more power. More is better, right? Not really. •Unless your engine is designed and ported for high-nitro fuels, you won't see much gain in performance above 20%25%. •While some people are running nitro levels as high as 50%, they have modified their engines to handle it.
• Aluminum corrosion can cause the entire inside of the engine to turn a dark grey or nearly black color. Corroded steel is rust. See above about rust. (CONTINUED) This kind of damage is not covered under the warrenty. • If the flywheel can't be tightened onto the engine without it trying to turn over, grip the drive washer in a pair of large adjustable pliers, like Channel Locks™, with the drive washer protected under several layers cloth. You could also try a strap wrench.
LIMITED WARRANTY Your engine is guaranteed to be free of defects in parts and workmanship for a period of 2 years from the date of purchase when returned for service accompanied by Your proof of purchase. Crash damage and problems caused by neglect or abuse will not be covered under warranty. Damagecaused by customer disassembly, tampering, use of substandard fuel, use of incorrect accessories (glow plug, prop, etc.
6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL: http://www.os-engmes.co.jp © Copyright 2004 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.