TOHATSU MFS 8A3 Page 67 Owner'S Manual Download

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Use a genuine propeller.
A propeller must be selected so that the engine rpm measured at wide open
throttle while cruising is within the recommended range.

5,000 to 6,000 rpm

PROPELLER TABLE

Propeller Mark

Propeller Size (Diameter

pitch)

No. of Brades

inch

Light boats

Heavy boats

9.5

8.9

226

255

8.5

8.9

8.3

226

211

7.5

8.5

7.5

216

190

7.0

8.9

7.0

226

178

6.5

8.5

6.5

216

165

Propeller Mark

Propeller Size (Diameter

pitch)

No. of Brades

inch

Light boats

Heavy boats

7.0

8.7

7.0

226

178

5.0

8.7

5.0

221

127

Summary of Contents for MFS 8A3

Page 1: ...MANUAL 8A3 9 8A3 MFS OWNER S OB No 003 11082 5...

Page 2: ...d in any from or by any means without the express written permission of Tohatsu Corporation READ THIS MANUAL BEFORE USING THE OUTBOARD MOTOR FAILURE TO FOLLOW THE INSTRUCTIONS AND SAFETY PRECAUTIONS I...

Page 3: ...ves as your warranty registration IF THIS PROCEDURE IS NOT FOLLOWED YOUR OUTBOARD MOTOR WILL NOT BE COVERED BY THE APPLICABLE LIMITED WARRANTY PRE DELIVERY CHECK Be sure that the product has been chec...

Page 4: ...proud owner of an excellent outboard motor that will service you for many years to come This manual should be read in its entirety and the inspection and maintenance procedures described later in this...

Page 5: ...OUTBOARD MOTOR 1 Removing the outboard motor 2 Carrying the outboard motor 3 Storing the outboard motor TRAILERING ADJUSTMENT 1 Steering friction 2 Throttle grip 3 Reverse lock 4 Remote Control Lever...

Page 6: ......

Page 7: ...ATION 4 PRE OPERATING PREPARATIONS 5 ENGINE OPERATION 6 REMOVING AND CARRYING THE OUTBOARD MOTOR 7 TRAILERING 8 ADJUSTMENT 9 INSPECTION AND MAINTENANCE 10 TROUBLESHOOTING 11 TOOL KIT AND SPARE PARTS 1...

Page 8: ...use of the Emergency Stop Switch tether Failure to observe will result in severe personal injury or death and possibly property damage Note This instruction provides special information to facilitate...

Page 9: ...service or maintenance on this outboard motor Be sure to use genuine parts genuine lubricants or recommended lubricants MAINTENANCE As the owner of this outboard motor you should be acquainted with co...

Page 10: ...Engine Type 4 Stroke Number of Cylinder 2 Bore Stroke mm in 55 44 2 17 1 73 Piston Displacement mL Cu in 209 12 8 Exhaust System Through hub exhaust Cooling System Water cooling Engine Lubrication Tro...

Page 11: ...900 Idle Speed in Neutral Gear rpm 950 Engine Type 4 Stroke Number of Cylinder 2 Bore Stroke mm in 55 44 2 17 1 73 Piston Displacement mL Cu in 209 12 8 Exhaust System Through hub exhaust Cooling Sys...

Page 12: ...Plug Lower Fill Oil Plug Upper Level 13 14 15 16 17 18 19 20 21 22 23 24 Drive Shaft Housing Thrust Rod Clamp Bracket Clamp Screw Shift Lever Throttle Grip Starter Handle Warning Lamp Fuel Connector S...

Page 13: ...g Lower Fill Oil Plug Upper Level 13 14 15 16 17 18 19 20 21 22 23 24 Drive Shaft Housing Clamp Bracket Clamp Screw Power tilt switch Throttle Grip Shift Lever Starter Handle Oil warning Lamp Fuel Con...

Page 14: ...rate the outboard motor until it has been securely mounted on the boat in accordance with the instructions below 1 Mounting the outboard motor on boat INSTALLATION Boat Transom Center of Boat Before b...

Page 15: ...motor without following this manual can lead to unsafe conditions such as poor maneuverability going out of control or re disaster Loose clamp screws and or mounting bolts can lead to coming off or d...

Page 16: ...such as poor maneuverability going out of control or re disaster Loose clamp screws and or mounting bolts can lead to coming off or displacement of outboard motor possibly going out of control or cau...

Page 17: ...ch then lock them with a lock nut Apply grease to the hole of the cable joint Fitting of Remote Control Cable to Engine 17 1 2 3 4 5 6 7 8 9 10 11 12 13 INSTALLATION 2 Installing the remote control de...

Page 18: ...Wiring Harness Pass the Cord assembly from the Remote control box through the hole in the Lower motor cover and cover the wire ends with the Sleeve provided in a tool bag and then connect the electri...

Page 19: ...ort circuits Make sure that the battery cords do not get stuck between the outboard motor and boat when turning etc The starter motor may fail to operate if the cords are incorrectly connected Be sure...

Page 20: ...features of batteries vary among the manufacturers Consult the manufacturer for details Battery electrolyte contains sulfuric acid and thus is hazardous causing a burn if it comes in contact with your...

Page 21: ...over lled may leak through an air vent screw when it is open Leaking gasoline is a dangerous re hazard Consult an authorized dealer for details on handling of gasoline if necessary Gasoline and its v...

Page 22: ...ospheric temperature from the chart below 22 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Note Use of engine oils that do not meet these requirements will result in reduced engine life and other engine problems T...

Page 23: ...tboard motor to deliver it full performance for longer service life Operating the outboard motor without break in can shorten service life of the product If any abnormality is experienced during the b...

Page 24: ...appropriate level Replenish engine oil If the oil level is within the appropriate level Consult with your dealer ESG is a device to prevent over revolution of the engine more than approximately 6 250...

Page 25: ...eezing the primer bulb until it is rm Be sure to install the stop switch lock to the stop switch 25 1 2 3 4 5 6 7 8 9 10 11 12 13 PRE OPERATING PREPARATIONS Before starting 1 Starting Note The engine...

Page 26: ...s in gear do not use it Contact an authorized dealer Note Start in gear protection prevents engine from starting at other than neutral shift In gear starting of engine will move the boat immediately p...

Page 27: ...l position Raise the Free accel lever a little both of cold engine and warm engine Turn the main switch key to START position Then continuously push the key to operate the choke Stop pushing the key w...

Page 28: ...of the starter lock wire Remove the bolts 3cps and remove the recoil starter assembly 28 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ENGINE OPERATION Do not keep turning starter motor for over 5 seconds or the...

Page 29: ...te to open position Choke plate open position closed position 29 1 2 3 4 5 6 7 8 9 10 11 12 13 ENGINE OPERATION Be sure that no bystander s is within 2 meters from back of starting operator Do not ope...

Page 30: ...t warm up shortens the engine s life Be sure to check that cooling water is coming out of the cooling water check port during warm up 30 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ENGINE OPERATION 2 Warming up...

Page 31: ...re shifting into forward or reverse make sure that boat is properly moored and outboard motor can be steered fully to the right and left Make sure that no swimmer s is ahead or astern of the boat Atta...

Page 32: ...ion Note Reduce the engine speed when the control lever is in Neutral and do not increase the engine speed unnecessarily Forward F T h r o t t l e T h r o t t l e Shift Shift Neutral N about 32 about...

Page 33: ...OPERATION Notes After stopping the engine close the air vent screw on the tank cap Disconnect the fuel connector of the engine or the fuel tank Disconnect the battery cord of the EF EP EFT or EPT typ...

Page 34: ...tal 34 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ENGINE OPERATION 5 Trim angle Perpendicular to the water surface Knob Excessive trim up or down may lead to unstable boat operation potentially causing the stee...

Page 35: ...on the Remote Control Lever to DN Improper Trim Angle bow dips into the water If the trim angle is too small the bow will dip into the water the speed will decrease and water may enter the boat In th...

Page 36: ...ob position Gently lower the outboard 36 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ENGINE OPERATION Thrust Rod Higher Lower Preset Knob Transom angle settings Tilt release position a b Do not put hand or nger...

Page 37: ...ch inoperative turn the manual valve to counter clockwise This will allow manual tilting of the outboard motor 37 1 2 3 4 5 6 7 8 9 10 11 12 13 ENGINE OPERATION Note Stop the engine before adjusting t...

Page 38: ...eeds and load It is imperative that the trim angle is adjusted correctly Incorrect adjustment will cause the boat to sway deteriorate engine performance and may cause unsafe steering conditions 75 4 3...

Page 39: ...to release the tilt lock Then lower the motor slowly EP type Tilt up Stop the engine Shift the outboard into forward Take hold of the tilt handle and raise the engine to the full up position and relea...

Page 40: ...nob in unlock position Do not tilt up outboard motor during operation or engine may be damaged from overheating due to lack of suf cient cooling water Do not put hand or nger in between outboard motor...

Page 41: ...oard motor at slow speed and keep the cooling water intake submerged Note Slow down to trolling speed and shift into neutral before setting outboard motor to shallow water drive position During shallo...

Page 42: ...decrease fuel efficiency and performance Please see LIMITED WARRANTY INFORMATION for more detail 42 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ENGINE OPERATION Do not tilt up or down outboard motor when swimmer...

Page 43: ...ing above Elevate power unit 2 inches to 4 inches if traveling to avoid oil spillage 2 Carrying the outboard motor 3 Storing the outboard motor REMOVING AND CARRYING THE OUTBOARD MOTOR Do not carry or...

Page 44: ...ay cause damage to the outboard motor boat etc If trailering with outboard fully down is not available the gear case skeg is too close to the road in a vertical position x the outboard motor securely...

Page 45: ...type The shift lever is normally locked in Reverse R the reverse lock link is in position A 45 1 2 3 4 5 6 7 8 9 10 11 12 13 1 Steering friction 2 Throttle grip 3 Reverse lock ADJUSTMENT Steering adju...

Page 46: ...ansom or service stand or acci dental drop or fall of outboard motor could lead to severe personal injury Be sure to lock outboard motor if it is tilted up or accidental fall of outboard motor could l...

Page 47: ...systems may be performed by any marine SI Spark Ignition engine repair establishment or individual 47 1 2 3 4 5 6 7 8 9 10 11 12 13 ADJUSTMENT Your personal safety and that of your passengers depends...

Page 48: ...the throttle grip Correct Recoil Starter Check the rope for wear and cha ng Check the ratchet engagement Replace Correct or replace Clutch and Propeller System Check that clutch engages correctly whe...

Page 49: ...milky color or appears contaminated Oil filler cap Dipstick Lower Level 600 mL Upper Level 800 mL Do not add engine oil of brand and grade other than existing one In case engine oil of other brand or...

Page 50: ...stream of water flowing out of the water pump indicator hole Continue flushing the outboard motor for 3 to 5 minutes carefully monitoring water supply at all times Stop the engine turn off the water...

Page 51: ...shaft Thrust holder Propeller Washer Split pin Nut Do not hold propeller with hand s when loosening or tightening propeller nut Put a piece of wood block between propeller blade and anti ventilation...

Page 52: ...o 0 035 in Notes Spark plug torque 18 0Nm 13 3ft lb 1 84kgf m If a torque wrench is not available when you are tting a spark plug a good estimate of the correct torque is 1 4 to 1 2 a turn past nger t...

Page 53: ...ded oils are as shown below ATF Dexron III Air purging from the Power Tilt unit Entrapped air in the Power Tilt unit will cause poor tilting movement With the outboard motor mounted on the boat set th...

Page 54: ...plug Check gaps Remove carbon deposits or Replace 0 8 0 9mm 0 031 0 035in Ignition timing Check timing Starting System Starter rope Check for wear or cha ng Starter motor Check for salt deposits and...

Page 55: ...high quality 4 stroke engine oil to insure performance and prolonged engine life Use oils that carry the API rating of SF SG SH SJ SL or SM Select the appropriate viscosity based on atmospheric temper...

Page 56: ...ed If engine oil level is over upper limit marks of oil gauge drain oil to level lower than upper limit Be sure that outboard motor is in upright and level position when checking or changing oil Stop...

Page 57: ...uel tank Water or dirt in the fuel tank will cause engine performance problems Check and clean the tank at periodical inspection or after the outboard motor has been stored for a long period of time o...

Page 58: ...oil giving it a milky colored appearance Contact your dealer Notes Use genuine gear oil or the recommended one API GL 5 SAE 80 to 90 Required volume approx 320 ml Be sure that outboard motor is secure...

Page 59: ...Apply grease to the propeller shaft Apply grease to all sliding parts joints nuts and bolts Stand the outboard motor up vertically in a dry place Battery Disconnect the battery cables Wipe off any che...

Page 60: ...to be changed again after running a short period to get all moisture completely out of the crankcase Inject a suf cient amount of engine oil through the spark plug holes Pull the recoil starter sever...

Page 61: ...the dealer and ask for the following checks Looseness or damage of power unit installation bolts gear case and extension case bolts propeller or propeller shaft upper and lower mount rubber bolts and...

Page 62: ...ut stopping soon Poor idling Poor acceleration Engine speed abnormally high Engine speed abnormally low Boat speed low Overheating of engine Warning lamp ON Power tilt inoperative Possible cause FUEL...

Page 63: ...CAL SYSTEM Spark plug other than speci ed Dirt soot etc on spark plug Faulty oil pressure switch No Spark or weak spark Short circuit of engine stop switch Ignition timing incorrect Lock plate not tte...

Page 64: ...SYSTEM Low compression Carbon deposits in the combustion chamber Incorrect valve clearance Low oil pressure level ENGINE OIL SYSTEM Low oil level Use of improper oil Oil deterioration Clogged oil str...

Page 65: ...Screwdrivers Screwdriver handle 1 1 1 1 1 1 1 10 13 mm 16 mm spark plug Cross and straight point Spare parts Starter rope Spark plug Split pin 1 1 1 1 600 mm NGK DCPR6E Parts Packaged with Engine Fuel...

Page 66: ...5 4 3 2 1 OPTIONAL ACCESSORIES Flushing attachment Genuine grease 250g Genuine gear oil 500ml Touch up paint 300ml Genuine engine oil 450ml Tachometer Propeller Tachometer with oil lamp for EPT High...

Page 67: ...2 3 4 5 6 7 8 9 10 11 12 13 PROPELLER TABLE Propeller Mark Propeller Size Diameter pitch No of Brades inch mm Light boats Heavy boats 9 5 3 8 9 10 226 255 8 5 3 8 9 8 3 226 211 7 5 3 8 5 7 5 216 190...

Page 68: ...M E M O...

Page 69: ...M E M O...

Page 70: ...M E M O...

Page 71: ......

Page 72: ...in any from or by any means without the express written permission of Tohatsu Corporation TOHATSU CORPORATION Address 5 4 3 chome Azusawa Itabashi ku TOKYO 174 0051 JAPAN Phone TOKYO 03 3966 3117 FAX...

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TOHATSU MFS 8A3, Owner'S Manual

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