🔎 Tohatsu MX40/50D3 Reference Library — Exploded parts diagrams (23 diagrams), specifications, common issues, and maintenance checklist.
The Tohatsu MX40/50D3 is a 2-Stroke outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.
Quick Reference Specifications
| Specification |
Value |
| Engine Type |
2-Stroke |
| Horsepower |
40 HP |
| Displacement |
697 |
| Bore x Stroke |
68 x 64 |
| Spark Plug (Type & Gap) |
NGK B8HS-10 |
| Engine Oil Capacity |
— |
| Recommended Engine Oil |
TC-W3 Certified 2-Stroke Oil |
| Gear Case Oil Capacity |
500 mL |
| Idle Speed (in gear) |
— |
| Full Throttle RPM Range |
5150-5850 |
| Fuel |
Unleaded Gasoline, 87 Octane min. |
Always verify specifications against your owner's manual for your specific serial number range.
Common Issues & Recommended Parts
Below are common maintenance scenarios for the Tohatsu MX40/50D3:
-
Water Pump / Overheating: If the tell-tale stream is weak or absent, the water pump impeller likely needs replacement. Inspect annually or every 100 hours. → Recommended: Water Pump Impeller Kit
-
Fuel System Issues / Hard Starting: Stale fuel and ethanol-related deposits are common in 2-stroke carbureted engines. Clean or rebuild carburetors and replace fuel lines if deteriorated. → Recommended: Carburetor Repair Kit, Fuel Line Assembly
-
Spark Plug Fouling: 2-stroke engines are prone to spark plug fouling from oil residue, especially at low RPM. Replace plugs at each annual service. → Recommended: OEM Spark Plugs
-
Gear Case Oil Leak: Check lower unit seals if gear oil appears milky (water contamination). Replace seals and gaskets during lower unit service. → Recommended: Lower Unit Seal Kit, Drain Plug Gaskets
-
Thermostat Failure: A stuck thermostat can cause overheating or poor warm-up. Replace if operating temperature is inconsistent. → Recommended: Thermostat Assembly
Parts Diagrams & OEM Part Numbers
Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Tohatsu MX40/50D3.
▶Fig.01 CYLINDER・CRANK CASE (50 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3TWJ01100-0 |
CYL BLOCK & CRANKCASE ASSY |
| 4 |
345-00117-0 |
* DOWEL PIN |
| 5 |
393-01137-0 |
* NIPPLE 5-4-5 |
| 6 |
393-01131-0 |
* NIPPLE 5.5-5 |
| 7 |
3KK-01012-0 |
* CYLINDER HEAD BOLT |
| 8 |
940103-0800 |
* WASHER |
| 9 |
3B7-76093-0 |
GROMMET 25-5 |
| 10 |
3LCJ01091-0 |
CYLINDER HEAD |
| 11 |
3C8-01005-5 |
CYLINDER HEAD GASKET |
| 12 |
3C8J01021-0 |
CYLINDER HEAD COVER |
| 13 |
3C8-01024-2 |
CYLINDER HEAD COVER GASKET |
| 14 |
9101E3-5620 |
BOLT |
| 15 |
353-01030-0 |
THERMOSTAT |
| 16 |
353J01031-0 |
THERMOSTAT CAP |
| 17 |
353-01032-0 |
THERMOSTAT CAP GASKET |
| 18 |
9101E3-5625 |
BOLT |
| 19 |
3B7-01046-0 |
PLUG |
| 20 |
345-01111-0 |
DOWEL PIN 6-12 |
| 21 |
3MC-01012-0 |
CYLINDER HEAD BOLT |
| 23 |
3C8-01513-1 |
HANGER |
| 24 |
3LD-01012-0 |
CYLINDER HEAD BOLT |
| 25 |
3KK-01015-1 |
WASHER |
| 26 |
3C8J02301-1 |
EXHAUST COVER (OUTER) |
| 27 |
3C8-02302-0 |
EXHAUST COVER (INNER) |
| 28 |
3C8-02305-2 |
EXHAUST COVER GASKET |
| 29 |
3MC-02319-0 |
BOLT |
| 30 |
9401E3-0600 |
WASHER |
| 31 |
9106E3-0808 |
BOLT |
| 32 |
332-60006-0 |
GASKET 8.1-15-1 |
| 33 |
338-60218-2 |
ANODE |
| 42 |
98AL-40-030 |
HOSE |
| 43 |
98AL-40-120 |
HOSE |
| 44 |
98AL-40-180 |
HOSE |
| 45 |
98AL-40-040 |
HOSE |
| 46 |
98AL-40-270 |
HOSE |
| 47 |
3LC-01160-0 |
CHECK VALVE |
| 48 |
3T5-01133-0 |
CLIP φ8 |
| 49 |
338-01133-0 |
CLIP φ7 |
| 50 |
3T5-84398-0 |
BAND 104 |
| 51 |
9701-1-1009 |
SPARK PLUG(B8HS-10) |
| 52 |
3PR-06972-0 |
CLAMP 6.5-47.5P |
| 53 |
910103-5612 |
BOLT |
| 54 |
910103-0630 |
BOLT |
| 55 |
930103-0600 |
NUT |
| 56 |
3C8-01303-4 |
ENGINE BASEMENT GASKET |
| 57 |
3C8-01291-0 |
CRANKCASE HEAD |
| 58 |
346-01216-0 |
O-RING 1.7-59 |
| 59 |
334-00122-0 |
OIL SEAL 25-40-8 |
| 60 |
3C8-01215-0 |
OIL SEAL 16-28-7 |
| 61 |
910103-5620 |
BOLT |
▶Fig.02 PISTON・CRANK SHAFT (28 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3LC-00030-1 |
CRANKSHAFT ASSY |
| 2 |
3LC-00041-0 |
* CONNECTING ROD |
| 3 |
345-00043-0 |
* ROLLER BEARING 25-32-20 |
| 4 |
345-00045-0 |
* BIG END BEARING WASHER |
| 5 |
3C8-00031-1 |
* CRANKSHAFT A |
| 6 |
3LC-00032-0 |
* CRANKSHAFT B |
| 7 |
3LC-00033-0 |
* CRANKSHAFT C |
| 8 |
3C8-00034-0 |
* CRANKSHAFT D |
| 9 |
348-00061-1 |
* CRANK PIN |
| 10 |
3C8-00114-0 |
* MAIN BEARING 6305R |
| 11 |
3J2-00114-0 |
* MAIN BEARING 6305 |
| 12 |
945107-2500 |
* C-RING d=25 |
| 13 |
3C8-00051-2 |
* LABYRINTH PACKING |
| 14 |
951407-0308 |
* SPRING PIN 3-8 |
| 16 |
346-00116-0 |
* SPACER 25.2-34-1.6 |
| 18 |
3LC-00046-1 |
SMALL END BEARING WASHER 17.6-22.4-4.45 |
| 19 |
3C8-00113-0 |
MAIN BEARING |
| 20 |
3C8-00121-0 |
* OIL SEAL 32-42-6 |
| 21 |
3C8-00108-0 |
O-RING 2.4-39.7 |
| 22 |
346-00115-0 |
THRUST PLATE |
| 24 |
3LC-87124-1 |
PISTON RING SET (0.5 O/S) |
| 26 |
3LC-00014-0 |
* PISTON RING (0.5 O/S) |
| 27 |
346-00014-0 |
* PISTON RING (0.5 O/S) |
| 32 |
3LC-87131-0 |
PISTON REPAIR KIT (0.5 O/S) |
| 33 |
3LC-00004-0 |
* PISTON (0.5 O/S) |
| 34 |
3LC-00021-0 |
* PISTON PIN |
| 35 |
3LC-00024-0 |
* PISTON PIN CLIP |
| 36 |
3LC-00090-0 |
NEEDLE ROLLER SET |
▶Fig.03 INTAKE MANIFOLD・REED VALVE (10 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3E3J02020-0 |
INTAKE MANIFOLD ASSY |
| 2 |
3C8-02104-2 |
INTAKE MANIFOLD GASKET |
| 3 |
910103-5625 |
BOLT |
| 4 |
910103-0625 |
BOLT |
| 5 |
3PR-06972-0 |
CLAMP 6.5-47.5P |
| 6 |
98AB-50-065 |
HOSE |
| 7 |
98AB-50-155 |
HOSE |
| 8 |
338-02215-0 |
CLIP φ10 |
| 9 |
3T5-02100-1 |
REED VALVE ASSY |
| 10 |
921521-6516 |
SCREW |
▶Fig.04 INTAKE SILENCER・CARBURETOR (50 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8-02420-0 |
BOLT 5-16 |
| 2 |
3C8-02418-0 |
GASKET |
| 3 |
3C8-02415-0 |
INTAKE SILENCER COVER |
| 4 |
3F3-02423-0 |
TAPPING SCREW 5-30 |
| 5 |
3LC-03200-1 |
CARBURETOR ASSY |
| 6 |
3LC-03207-1 |
CARBURETOR ASSY (SECOND) |
| 7 |
3LC-04438-0 |
MAIN JET (#138) |
| 8 |
3M2-03152-0 |
* SLOW JET (#80) |
| 9 |
3C8-03169-0 |
* PLUG |
| 10 |
3LD-03147-0 |
* FLOAT VALVE |
| 11 |
3C8-03126-0 |
* FLOAT ARM PIN |
| 12 |
3C8-03125-0 |
* FLOAT |
| 13 |
921722-0410 |
* SCREW |
| 14 |
3C8-03179-1 |
* STOP SCREW |
| 15 |
3C8-03157-0 |
* SPRING |
| 16 |
3C8-03156-0 |
* ADJUST SCREW |
| 17 |
3C8-03120-0 |
* FLOAT CHAMBER |
| 18 |
3C8-03121-0 |
* FLOAT CHAMBER GASKET |
| 19 |
910306-0405 |
* BOLT |
| 20 |
3C8-03193-0 |
* GASKET |
| 21 |
3E3-03141-0 |
* MAIN NOZZLE |
| 22 |
3C8-03181-0 |
* CARBURETOR COVER |
| 23 |
3C8-03182-0 |
* CARBURETOR COVER GASKET |
| 24 |
922503-6410 |
* SCREW |
| 25 |
3LC-03210-1 |
CARBURETOR ASSY (THIRD) |
| 26 |
3C8-04004-0 |
* PUMP COVER |
| 27 |
3E3-64333-0 |
* PRE-COATED SCREW |
| 28 |
3C8-04018-0 |
* PUMP COVER GASKET |
| 29 |
350-04014-0 |
* CHECK VALVE |
| 30 |
921703-0305 |
* SCREW |
| 31 |
930203-0300 |
* NUT |
| 32 |
350-04005-0 |
* PUMP DIAPHRAGM |
| 33 |
3C8-04028-0 |
* PUMP BODY GASKET |
| 34 |
3C8-04002-0 |
* PUMP BODY |
| 35 |
3C8-03123-0 |
* LOWER FLOAT CHAMBER |
| 36 |
3E3-02011-0 |
CARBURETOR GASKET |
| 37 |
916103-0685 |
BOLT |
| 38 |
941303-0600 |
SPRING WASHER |
| 39 |
940103-0600 |
WASHER |
| 40 |
98AB-50-080 |
HOSE |
| 41 |
338-02215-0 |
CLIP φ10 |
| 42 |
348-63717-1 |
ROD 5-68 |
| 43 |
3B7-05229-0 |
BALL JOINT CONNECTOR |
| 44 |
3B7-05243-0 |
BALL JOINT CONNECTOR |
| 45 |
930103-0500 |
NUT |
| 46 |
3C8-67191-1 |
CHOKE ROD 3-90 |
| 47 |
3E3-02411-0 |
INTAKE SILENCER |
| 49 |
3C8-02417-0 |
INTAKE SILENCER LOCK PLATE |
| 51 |
3C8-67192-0 |
CHOKE ROD |
| 52 |
346-67196-1 |
ROD SNAP 3-B |
▶Fig.05 FUEL LINE (11 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8-71035-0 |
OIL FILTER BRACKET |
| 2 |
910103-6614 |
BOLT |
| 3 |
3AD-02230-0 |
FUEL FILTER ASSY |
| 4 |
3AD-02237-0 |
* CUP |
| 5 |
3AD-02235-0 |
* O-RING |
| 6 |
3AD-02234-0 |
* FILTER |
| 7 |
930103-0800 |
NUT |
| 8 |
940103-0800 |
WASHER |
| 11 |
98AB-50-350 |
HOSE |
| 12 |
98AB-50-530 |
HOSE |
| 13 |
338-02215-0 |
CLIP φ10 |
▶Fig.06 THROTTLE (21 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8-63711-1 |
ADVANCER ARM |
| 2 |
910103-0635 |
BOLT |
| 4 |
3C8-63732-0 |
COLLAR 6.2-12-17 |
| 6a |
3MC-63718-0 |
THROTTLE CAM |
| 9a |
910103-0625 |
BOLT |
| 10a |
346-67115-0 |
WASHER 6.5-21-1 |
| 12a |
3GF-06304-0 |
COLLAR 9.1-16-10.8 |
| 13 |
346-05228-1 |
BALL JOINT |
| 13b |
930103-0600 |
NUT |
| 14a |
3MC-63715-0 |
ROD |
| 17a |
3PR-63709-0 |
THROTTLE ROD |
| 18 |
3B7-05243-0 |
BALL JOINT CONNECTOR |
| 19 |
930103-0500 |
NUT |
| 20 |
3C8-63733-0 |
ROD SNAP 5-3 |
| 24 |
3C8-05213-0 |
THROTTLE LIMITER ARM |
| 30 |
3C8-05221-0 |
THROTTLE LIMITER ROD 3.5-56 |
| 31 |
3C8-05223-0 |
ROD SNAP 3.5-4 |
| 32 |
3C8-05211-0 |
STARTER LOCK ARM |
| 33 |
910103-5625 |
BOLT |
| 34 |
940103-0600 |
WASHER |
| 35 |
353-76079-0 |
COLLAR 6.2-9-9.3 |
▶Fig.07 RECOIL STARTER (31 parts)
| Ref |
OEM Part # |
Part Name |
| 2 |
3TW-05000-0 |
RECOIL STARTER ASSY |
| 3 |
3TW-05105-0 |
* STARTER CASE |
| 4 |
3TW-05106-0 |
* REEL ASSY |
| 5 |
3R3-05003-0 |
* RATCHET |
| 6 |
3TW-05123-0 |
* RETURN SPRING |
| 7 |
3TW-05913-0 |
* TAPPING SCREW |
| 8 |
3TW-06437-0 |
* TAPPING SCREW 6-25 |
| 9 |
3TY-05913-0 |
* TAPPING SCREW |
| 11 |
3TW-05013-0 |
* STARTER ROPE |
| 12 |
3C8-05019-0 |
* STARTER HANDLE |
| 13 |
3R3-05131-0 |
* ROPE ANCHOR |
| 14 |
3TW-05014-0 |
* ROPE GUIDE |
| 15 |
3C8-05252-0 |
* STARTER LOCK |
| 16 |
3C8-05253-0 |
* STARTER LOCK CAM |
| 17 |
3C8-05216-0 |
* STARTER LOCK SPRING |
| 18 |
3C8-05237-0 |
* WASHER |
| 19 |
951503-1520 |
* SPLIT PIN |
| 20 |
3C8-05217-0 |
* STARTER LOCK WIRE |
| 21 |
3C8-05238-0 |
* PIPE |
| 22 |
3TW-05004-0 |
* STARTER SPRING |
| 23 |
3TW-05007-0 |
* FRICTION SPRING |
| 24 |
3TW-05012-0 |
* RETURN SPRING |
| 25 |
3TW-05006-0 |
* FRICTION PLATE |
| 26 |
3TW-67503-0 |
STARTER SEAL |
| 27 |
3TW-05901-0 |
STARTER PULLEY |
| 28 |
3AL-60108-0 |
PRE-COATED BOLT 6-20 |
| 29 |
3C8-66308-0 |
WASHER 6-16-1.5 |
| 38 |
9101F4-0818 |
BOLT |
| 39 |
940103-0800 |
WASHER |
| 40 |
314-72185-0 |
CAUTION DECAL |
| 41 |
3F0-72185-0 |
CAUTION DECAL |
▶Fig.08 MAGNETO (22 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8-06101-1 |
FLYWHEEL W/RING GEAR |
| 2 |
3C8-06103-3 |
COIL PLATE ASSY W/ALTERNATOR |
| 3 |
3C8-06130-2 |
* PULSAR COIL & PLATE ASSY |
| 4 |
3B7-06131-0 |
* PULSAR HOLDER |
| 5 |
3C8-06120-1 |
* EXCITER COIL |
| 6 |
921521-6630 |
* SCREW |
| 7 |
3C8-06123-1 |
* ALTERNATOR ASSY |
| 8 |
3B7-06135-0 |
* HOLDER |
| 9 |
921521-0406 |
* SCREW |
| 10 |
3B7-06132-0 |
* CLAMP |
| 11 |
921521-6406 |
* SCREW |
| 12 |
3B7-06133-0 |
* BAND |
| 13 |
921503-6510 |
SCREW |
| 14 |
334-00131-0 |
KEY |
| 15 |
353-00132-0 |
NUT 18-P1.5 |
| 16 |
353-00133-0 |
WASHER 19-34-3 |
| 17 |
3C8-63722-0 |
GUIDE PLATE |
| 18 |
3C8-63725-0 |
GUIDE PLATE COVER |
| 19 |
3C8-63723-0 |
SETTING RING |
| 20 |
346-05228-1 |
BALL JOINT |
| 21 |
941303-0600 |
SPRING WASHER |
| 22 |
910121-6616 |
BOLT |
▶Fig.09 ELECTRIC PARTS (STARTER MOTOR) (28 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3GF-76010-0 |
STARTER MOTOR ASSY |
| 2 |
3GF-76015-0 |
* PINION ASSY |
| 3 |
3GF-75015-0 |
* WASHER |
| 4 |
3GF-75014-0 |
* BRUSH HOLDER ASSY |
| 5 |
921521-6408 |
* SCREW |
| 6 |
3GF-75016-0 |
* BUSHING 1 |
| 7 |
3GF-75017-0 |
* BUSHING 2 |
| 8 |
3GF-75018-0 |
* O-RING |
| 9 |
940103-0600 |
* WASHER |
| 10 |
941303-0600 |
* SPRING WASHER |
| 11 |
930203-0600 |
* NUT |
| 12 |
3GF-75019-0 |
* BOLT |
| 13 |
941321-0500 |
* SPRING WASHER |
| 14 |
940221-0500 |
* WASHER |
| 16 |
910103-5825 |
BOLT |
| 19 |
3C8J05101-0 |
BRACKET |
| 20 |
3C8-76007-0 |
DAMPER |
| 21 |
3C8-76009-0 |
STARTER MOTOR BAND |
| 22 |
910103-6825 |
BOLT |
| 23 |
910103-6820 |
BOLT |
| 24 |
346-76040-0 |
STARTER SOLENOID |
| 25 |
910103-6616 |
BOLT |
| 26 |
3C8-76141-1 |
STARTER CABLE L=160 |
| 27 |
3B7-76120-2 |
BATTERY CABLE L=3000 |
| 28 |
910103-6612 |
BOLT |
| 29 |
3A3-76145-0 |
TERMINAL CAP 8-13-28 |
| 30 |
3B7-76145-0 |
TERMINAL CAP 8-13-30 |
| 31 |
3C8-76049-0 |
LEAD WIRE |
▶Fig.10 ELECTRIC PARTS (C.D. UNIT) (22 parts)
| Ref |
OEM Part # |
Part Name |
| 9 |
3PR-06050-0 |
IGNITION COIL W/CAP |
| 12 |
3M2-06926-0 |
* PLUG CAP TERMINAL |
| 13 |
3LD-06921-0 |
* PLUG CAP |
| 14 |
910103-5620 |
BOLT |
| 15 |
151-33159-0 |
GASKET 6.2-11-1 |
| 16 |
3C7-76142-1 |
GROUND CABLE L=170 |
| 17 |
3T5-84398-0 |
BAND 104 |
| 18 |
3C8-06160-1 |
CD UNIT |
| 19 |
3TW-60103-0 |
O-RING 3.1-94.4 |
| 20 |
3TW-06901-1 |
BRACKET |
| 21 |
353-76213-0 |
SPARE FUSE 20A |
| 22 |
3C8-06902-0 |
COVER |
| 24 |
921503-5514 |
SCREW |
| 25 |
346-67113-0 |
MOUNT 8.5-14-2.5 |
| 26 |
3B7-06920-0 |
RUBBER MOUNT 8.5-14-2.5 |
| 27 |
346-67114-1 |
SPACER 6.2-9-15.7 |
| 28 |
910103-5630 |
BOLT |
| 29 |
346-67115-0 |
WASHER 6.5-21-1 |
| 30 |
3N4-76142-1 |
GROUND CABLE L=270 |
| 31 |
910103-0612 |
BOLT |
| 33 |
910403-0612 |
BOLT |
| 34 |
3A3-76037-0 |
CABLE TERMINAL PLUG |
▶Fig.11 ELECTRIC PARTS (DIAGRAM) (5 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3B7-76065-5 |
RECTIFIER COMPLETE |
| 2 |
921503-7625 |
SCREW |
| 21 |
3TW-76172-0 |
OVERHEAT SENSOR ASSY |
| 25 |
3C8-76171-0 |
OVERHEAT BUZZER |
| 26 |
3TW-76174-0 |
STAY |
▶Fig.13 DRIVE SHAFT HOUSING (29 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8Q61192-4 |
DRIVE SHAFT HOUSING (L) |
| 2 |
3MC-61017-0 |
BOLT |
| 5 |
3C8Q61110-0 |
EXTENSION HOUSING |
| 6 |
346-65204-0 |
WATER PIPE AUXILIARY MOUNT |
| 7 |
346-66037-0 |
CAM ROD HOLDER |
| 8 |
353-66024-0 |
STOPPER |
| 9 |
910103-5612 |
BOLT |
| 10 |
9101E3-5835 |
BOLT |
| 11 |
3C8Q61120-0 |
EXTENSION HOUSING (LL) |
| 12 |
346-61111-1 |
STUD |
| 13 |
930103-0800 |
NUT |
| 14 |
9401E3-0800 |
WASHER |
| 15 |
3C8-61012-2 |
DRIVE SHAFT HOUSING GASKET |
| 16 |
3C8Q01301-0 |
ENGINE BASEMENT |
| 17 |
3C8-67116-0 |
ENGINE BASEMENT SEAL L=805 |
| 18 |
910103-5625 |
BOLT |
| 19 |
345-01111-0 |
DOWEL PIN 6-12 |
| 20 |
3C8-02311-1 |
EXHAUST PIPE |
| 21 |
3C8-02319-0 |
BOLT 8-30 |
| 22 |
3C8-02312-2 |
EXHAUST PIPE GASKET |
| 23 |
3C8-61180-0 |
EXHAUST HOUSING |
| 24 |
3C8-61184-0 |
BOLT 8-30 |
| 25 |
3C8-61181-2 |
EXHAUST HOUSING GASKET |
| 26 |
3C8-61182-0 |
GROMMET |
| 27 |
3C8Q61210-1 |
APRON |
| 28 |
3C8-61212-0 |
GROMMET |
| 29 |
3C8-61213-1 |
SEAL |
| 30 |
9215E3-5540 |
SCREW |
| 31 |
930403-0500 |
NYLON NUT 5-P0.8 |
▶Fig.14 GEAR CASE (DRIVE SHAFT) (47 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3TWQ60090-0 |
GEAR CASE ASSY |
| 2 |
3TW-60211-0 |
* ROLLER BEARING 22-30-20 |
| 3 |
332-60005-2 |
PLUG 8-8 |
| 4 |
3B7-60015-1 |
PLUG M10P1.25 |
| 5 |
3B7-60016-1 |
GASKET 10.1-15-1 |
| 6 |
332-60006-0 |
GASKET 8.1-15-1 |
| 7 |
3C8-60217-1 |
TRIM TAB |
| 8 |
910103-5620 |
BOLT |
| 9 |
3TW-64020-0 |
BEVEL GEAR B |
| 10 |
3C8-64027-0 |
NUT |
| 11 |
345-64084-0 |
SHIM 41-51.5-0.5 |
| 13 |
3C8-64304-0 |
DRIVE SHAFT (LL) |
| 14 |
3C8-60213-0 |
BALL BEARING 6304 |
| 15 |
3C8-64327-0 |
DRIVE SHAFT SPRING |
| 16 |
3C8-65021-2 |
WATER PUMP IMPELLER |
| 17 |
332-65022-0 |
KEY |
| 18 |
3T5-65016-0 |
PUMP CASE (UPPER) |
| 19 |
3T5-65011-0 |
PUMP CASE LINER |
| 20 |
3C8-65014-0 |
WATER PIPE SEAL (LOWER) |
| 21 |
3KY-65017-1 |
PUMP CASE (LOWER) |
| 22 |
3C8-64084-0 |
SHIM 32.9-26-0.5 |
| 23 |
3C8-60223-0 |
OIL SEAL 17-33-6 |
| 24 |
345-65015-0 |
O-RING 3.2-47 |
| 25 |
334-65012-0 |
DOWEL PIN 4-10 |
| 26 |
3C8-65025-0 |
WATER PUMP GUIDE PLATE |
| 27 |
3C8-65029-2 |
GUIDE PLATE GASKET |
| 28 |
3T5-65018-2 |
PUMP CASE GASKET |
| 29 |
9101E3-5855 |
BOLT |
| 30 |
3C8-60204-0 |
SUB-WATER INLET STRAINER |
| 31 |
910103-5616 |
BOLT |
| 32 |
3C8-66011-0 |
CLUTCH CAM |
| 33 |
3C8-66015-0 |
CAM ROD (LL) |
| 34 |
951407-0312 |
SPRING PIN 3-12 |
| 35 |
3C8-66031-1 |
CAM ROD BUSHING |
| 36 |
332-66021-0 |
O-RING 2.4-5.8 |
| 37 |
3C8-66032-0 |
O-RING 3.5-21.7 |
| 38 |
3C8-66241-0 |
SHIFT ROD JOINT |
| 39 |
951403-0312 |
SPRING PIN 3-12 |
| 40 |
353-66024-0 |
STOPPER |
| 41 |
910103-6612 |
BOLT |
| 42 |
9101E3-5835 |
BOLT |
| 43 |
3C8-65130-0 |
WATER PIPE (LL) |
| 44 |
345-65206-0 |
WATER PIPE SEAL (UPPER) |
| 45 |
345-65205-0 |
COLLAR 18-20-4.5 |
| 46 |
3C8-60205-1 |
WATER STRAINER SET |
| 47 |
921503-0438 |
* SCREW |
| 48 |
930403-0400 |
* NYLON NUT 4-P0.7 |
▶Fig.15 GEAR CASE (PROPELLER SHAFT) (28 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
345-60215-0 |
TAPERED ROLLER BEARING 32007 |
| 2 |
3C8-60108-2 |
PRE-COATED BOLT 6-25 6-25 |
| 3 |
9401E3-0600 |
WASHER |
| 4 |
3TW-64010-0 |
BEVEL GEAR ASSY (A) |
| 5 |
3TW-64030-0 |
BEVEL GEAR C |
| 6 |
345-64032-0 |
WASHER 22.1-28-3 |
| 7 |
353-64038-0 |
SHIM 36-44-0.1 |
| 8 |
3C8-64211-0 |
PROPELLER SHAFT |
| 9 |
3C8-64217-0 |
PIN |
| 9a |
3C8-64215-2 |
CLUTCH |
| 10 |
3C8-64222-0 |
SPRING RETAINER |
| 11 |
3C8-64221-0 |
SPRING |
| 12 |
3C8-64219-1 |
SNAP |
| 13 |
3C8Q60100-1 |
PROPELLER SHAFT HOUSING ASSY |
| 14 |
3C8Q60101-1 |
* PROPELLER SHAFT HOUSING |
| 15 |
345-60211-0 |
* ROLLER BEARING 22-30-30 |
| 16 |
3F3-60223-0 |
* OIL SEAL 22-37-8 |
| 17 |
9601-0-6007 |
* BALL BEARING 6007 |
| 18 |
345-60103-0 |
* O-RING 3.5-69.4 |
| 19 |
3C8-64223-1 |
PUSH ROD |
| 20 |
965002-0803 |
BALL 3/8 |
| 21 |
3T5B64532-1 |
PROPELLER ASSY (15) |
| 22 |
3TW-87326-0 |
PROPELLER HARDWARE KIT |
| 23 |
3C8-64231-0 |
* THRUST HOLDER |
| 24 |
3TW-64232-0 |
* STOPPER |
| 25 |
3TW-64124-0 |
* WASHER 17-40-3 |
| 26 |
353-64121-0 |
* PROPELLER NUT M16P1.5 |
| 27 |
951503-0325 |
* SPLIT PIN 3-25 |
▶Fig.18 BRACKET (MANUAL TILT) (61 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8Q62112-1 |
CLAMP BRACKET (R) |
| 2 |
9101E3-0612 |
BOLT |
| 3 |
3C8Q62113-1 |
CLAMP BRACKET (L) |
| 4 |
3B7-60218-1 |
ANODE |
| 5 |
910103-5630 |
BOLT |
| 6 |
3AC-62191-0 |
SWIVEL BRACKET SHAFT ASSY |
| 7 |
346-62124-1 |
NYLON NUT 7/8-14 |
| 8 |
349-62126-0 |
BUSHING |
| 9 |
3C8-62132-0 |
BUSHING 22-25-35.5 |
| 10 |
346-62127-0 |
CAP NUT |
| 11 |
3C8-62117-1 |
DISTANCE PIECE 9.4-13.8-116 |
| 12 |
930103-0800 |
NUT |
| 14 |
3C8-62120-1 |
BOLT 8-170 |
| 15 |
3C8-62121-1 |
THRUST ROD |
| 16 |
345-62122-2 |
THRUST ROD SPRING |
| 17 |
3C8Q62310-3 |
SWIVEL BRACKET |
| 18 |
344-67177-1 |
GREASE FITTING |
| 19 |
940103-0600 |
WASHER |
| 20 |
345-62441-0 |
FRICTION PIECE |
| 21 |
346-62421-1 |
FRICTION SPRING |
| 22 |
9101E3-0830 |
BOLT |
| 23 |
3E3Q62010-0 |
STEERING SHAFT ASSY |
| 24 |
345-62417-0 |
BUSHING 26-32 |
| 25 |
3A0-62423-2 |
THRUST PLATE (UPPER) 27-50-1 |
| 26 |
346-62424-1 |
THRUST PLATE (LOWER) 26.5-46-1 |
| 27 |
3H8-62415-0 |
O-RING 3.5-25.7 |
| 28 |
945103-2500 |
C-RING d=25 |
| 29 |
3C8-61302-1 |
RUBBER MOUNT (LOWER) |
| 30 |
3C8Q61411-3 |
MOUNT BRACKET |
| 31 |
3C8-61336-0 |
DAMPER (LOWER) |
| 32 |
3C8-61321-1 |
BOLT 12-114.5 |
| 34 |
3C7-61338-0 |
DAMPER 21-36-5 |
| 35 |
930403-1200 |
NYLON NUT 12-P1.75 |
| 36 |
9402E3-1200 |
WASHER |
| 37 |
3C8Q61342-0 |
MOUNT HOLDING PLATE (LOWER) |
| 38 |
9101E3-5620 |
BOLT |
| 39 |
3C8-62097-0 |
STUD 10-50 P1.25 |
| 40 |
3E3-61301-2 |
RUBBER MOUNT (UPPER) |
| 41 |
353-61307-1 |
BOLT 3/8-100 |
| 42 |
3E3-61333-0 |
DAMPER (UPPER) |
| 43 |
353-61335-0 |
WASHER 10-29-3 |
| 44 |
3E3-61335-0 |
LOCK PLATE |
| 45 |
3C8-61341-0 |
MOUNT HOLDING PLATE (UPPER) |
| 46 |
9101E3-5835 |
BOLT |
| 47 |
3C8-62396-1 |
GROUND L=210 |
| 48 |
398-62396-1 |
GROUND L=130 |
| 50 |
3A3-62396-1 |
GROUND L=110 |
| 51 |
910103-5612 |
BOLT |
| 52 |
3C8-72120-0 |
RIGGING BOLT SET |
| 53 |
3C7-62133-2 |
* BOLT 12-105 P1.25 |
| 54 |
353-61334-0 |
* WASHER 13-34-3 |
| 55 |
940103-1200 |
* WASHER |
| 56 |
3C7-62139-1 |
* NUT 12-P1.25 |
| 60 |
3RSQ62105-0 |
CLAMP SCREW KIT |
| 61 |
3RSQ62108-0 |
* CLAMP SCREW ASSY |
| 62 |
3RS-62106-0 |
** CLAMP SCREW |
| 63 |
3RSQ62102-0 |
** CLAMP SCREW HANDLE |
| 64 |
951403-0622 |
** SPRING PIN |
| 65 |
332-62101-1 |
* CLAMP SCREW PAD |
| 66 |
945303-0600 |
* E-RING d=6 |
| 67 |
9402E3-0800 |
WASHER |
▶Fig.19 MANUAL TILT (24 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8Q62431-0 |
TILT STOPPER ASSY |
| 2 |
346-62437-0 |
BUSHING 10.2-12-29.5 |
| 3 |
346-62439-1 |
SETTING PLATE |
| 4 |
9101E3-5820 |
BOLT |
| 5 |
3C8-62421-1 |
FRICTION SPRING |
| 6 |
346-62438-0 |
SETTING PIECE |
| 7 |
3C8-66352-2 |
REVERSE LOCK (L) |
| 8 |
3C8-66351-2 |
REVERSE LOCK (R) |
| 9 |
3C8-66313-4 |
REVERSE LOCK ARM |
| 10 |
3C8-66319-1 |
REVERSE LOCK SHAFT |
| 11 |
945303-0600 |
E-RING d=6 |
| 12 |
3C8-66321-0 |
REVERSE LOCK ROD |
| 13 |
951503-0212 |
SPLIT PIN 2-12 |
| 14 |
3E3-62436-1 |
TILT STOPPER LEVER |
| 15 |
3C8-66332-2 |
REVERSE LOCK SPRING (L) |
| 16 |
3AL-05254-0 |
SHOULDER BOLT 6-8 |
| 17 |
3R0-66308-0 |
WASHER 6-16-1.5 |
| 18 |
940103-0800 |
WASHER |
| 19 |
3AL-05212-0 |
BUSHING 8.1-20 |
| 20 |
3AA-83719-0 |
WASHER 8.5-18-1.6 |
| 21 |
3C8-66318-1 |
LINK |
| 22 |
3C8-66336-0 |
SPRING |
| 23 |
346-66333-0 |
REVERSE LOCK LEVER GRIP |
| 24 |
346-66334-0 |
STOPPER |
▶Fig.22 TILLER HANDLE (F TYPE) (33 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3E3Q62001-0 |
STEERING BRACKET |
| 2 |
3C8-62098-0 |
NYLON NUT 10-P1.25 |
| 3 |
9402E3-1000 |
WASHER |
| 4 |
3C8Q63003-1 |
TILLER HANDLE ASSY |
| 5 |
3C8Q63011-2 |
* TILLER HANDLE |
| 6 |
398-63012-0 |
* GRIP |
| 7 |
3C8-63041-1 |
* THROTTLE SHAFT |
| 8 |
345-63048-0 |
* THROTTLE SHAFT DAMPER |
| 9 |
398-63053-0 |
* SPACER |
| 10 |
951403-0310 |
* SPRING PIN 3-10 |
| 11 |
350-63046-0 |
* BUSHING 8.4-10-11 |
| 12 |
921803-0525 |
* SCREW |
| 13 |
3C8-63063-0 |
* THROTTLE SHAFT SUPPORT |
| 14 |
9101E3-5612 |
* BOLT |
| 15 |
3V1-63035-1 |
* FRICTION PIECE |
| 16 |
3V1-63077-0 |
* ADJUSTING NUT |
| 17 |
3V1-63036-0 |
* SPRING |
| 18 |
910103-0625 |
* BOLT |
| 19 |
369-72019-1 |
* THROTTLE DECAL |
| 20 |
3C8-63101-0 |
BUSHING |
| 21 |
3B2-63108-0 |
WASHER 30-45-1 |
| 22 |
3B2-63109-0 |
WAVE WASHER 30-45-1.2 |
| 23 |
3C8-63102-1 |
BUSHING |
| 24 |
9401E3-1000 |
WASHER |
| 25 |
930103-1000 |
NUT 10-P1.5 |
| 26 |
3C8-63600-1 |
THROTTLE WIRE |
| 27 |
3C8-63607-0 |
CLIP |
| 28 |
3C8-63508-1 |
THROTTLE WIRE BRACKET |
| 29 |
910103-5614 |
BOLT |
| 33 |
3E5Q63028-1 |
TILLER HANDLE HOLDER ASSY |
| 34 |
9153E3-1022 |
* STUD |
| 35 |
3T5-62004-0 |
CORD HOLDER |
| 36 |
921903-0625 |
SCREW |
▶Fig.23 BOTTOM COWL・SHIFT (54 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
346-67113-0 |
MOUNT 8.5-14-2.5 |
| 2 |
346-67114-1 |
SPACER 6.2-9-15.7 |
| 3 |
3C8-67151-1 |
CHOKE ROD |
| 4 |
3C8-67156-0 |
BUSHING |
| 5 |
345-67117-0 |
GROMMET 17-2.7 |
| 6 |
3C8Q67141-0 |
HOOK LEVER |
| 7 |
3C8-67146-0 |
WASHER 14-22-1 |
| 8 |
338-67147-0 |
SEAL RING 13.8-22-3.7 |
| 9 |
369-67105-0 |
HOOK LEVER BUSHING |
| 10 |
941403-1400 |
WAVE WASHER d=14 |
| 11 |
3MC-67142-0 |
COVER HOOK |
| 12 |
910103-0612 |
BOLT |
| 13 |
3C8-66308-0 |
WASHER 6-16-1.5 |
| 17 |
3C8-67162-1 |
GROMMET |
| 18 |
345-76092-0 |
GROMMET 20-3 |
| 20 |
3C8-63621-0 |
GROMMET 30-12-2.5 |
| 21 |
345-06915-0 |
CLAMP 6.5-14L |
| 22 |
910103-5612 |
BOLT |
| 23 |
930103-0600 |
NUT |
| 24 |
3PR-06972-0 |
CLAMP 6.5-47.5P |
| 25 |
910103-5610 |
BOLT |
| 26 |
3B2-67187-0 |
GROMMET 16-17.5 |
| 27 |
3T1-01138-0 |
NIPPLE 6-8-11 |
| 28 |
98AB-50-260 |
HOSE |
| 31 |
3C8-76080-2 |
NEUTRAL SWITCH |
| 32 |
3B7-63731-0 |
WASHER 12.5-24-1 |
| 38 |
3C8-06820-0 |
STOP SWITCH ASSY |
| 39 |
353-06821-0 |
* STOP SWITCH LANYARD ASSY |
| 40 |
3E3-66110-0 |
SHIFT LEVER |
| 41 |
3C8-66122-1 |
SHIFT ARM |
| 42 |
350-67101-0 |
BUSHING |
| 43 |
941403-1200 |
WAVE WASHER d=12 |
| 44 |
3C8-66225-0 |
SHIFT ROD LEVER |
| 45 |
951703-0800 |
SNAP RETAINER d=8 |
| 46 |
3C8-66113-1 |
SHIFT DETENT SPRING |
| 47 |
3C8-66117-0 |
SHIFT DETENT SUPPORTER |
| 48 |
910103-5616 |
BOLT |
| 55 |
3B2-70260-1 |
FUEL CONNECTOR (MALE) |
| 56 |
332-70261-0 |
NUT 10-P1.25 |
| 57 |
336-70112-0 |
GASKET 10.2-16-0.5 |
| 58 |
9101E3-0630 |
BOLT |
| 59 |
346-67115-0 |
WASHER 6.5-21-1 |
| 60 |
3M2-66226-0 |
GROMMET 17-3 |
| 61 |
3C8-66211-0 |
SHIFT ROD |
| 62 |
951403-0312 |
SPRING PIN 3-12 |
| 69 |
3C8Q76118-0 |
CLAMP |
| 70 |
910103-5625 |
BOLT |
| 73 |
360-72025-0 |
SPARK PLUG DECAL (B8HS-10) |
| 74 |
3C8Q67110-1 |
BOTTOM COWL W/GROMMET |
| 76 |
3F3-72618-0 |
* GROMMET 47-2.5 |
| 77 |
361-76026-0 |
MAIN SWITCH ASSY |
| 78 |
346-76039-1 |
SWITCH PROTECTOR (FOOLPROOF) |
| 79 |
369-66043-1 |
GROMMET 10.7-3.5 |
| 80 |
3TW-67179-0 |
DRAIN PLUG |
▶Fig.24 TOP COWL (9 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3TWH67645-1 |
TOP COWL ASSY |
| 4 |
3TWH67640-0 |
TOP COWL SUB-ASSY |
| 6 |
3TWH67521-0 |
** TILT HANDLE |
| 7 |
930403-0600 |
** NYLON NUT 6-P1.0 |
| 8 |
3C8-66308-0 |
** WASHER 6-16-1.5 |
| 9 |
3LC-67501-0 |
** TOP COWL SEAL |
| 20 |
3TY-87801-0 |
* DECAL SET (MX40D3) |
| 22 |
3F0-72185-0 |
CAUTION DECAL |
| 23 |
3AC-72200-0 |
STOP SWITCH DECAL |
▶Fig.25 FUEL TANK (19 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3B7-70200-5 |
PRIMER BULB ASSY |
| 2 |
3C7-70220-1 |
* JOINT ASSY (INLET) |
| 3 |
3C7-70224-1 |
* JOINT ASSY (OUTLET) |
| 4 |
3C7-70211-1 |
* PRIMER BULB |
| 5 |
3C7-70217-0 |
* CLAMP |
| 6 |
98AB-70-700 |
* HOSE |
| 7 |
98AB-701600 |
* HOSE |
| 8 |
3B7-70280-1 |
* FUEL CONNECTOR MARK |
| 9 |
3GF-70281-0 |
* FUEL CONNECTOR |
| 10 |
3GF-70250-1 |
* FUEL CONNECTOR |
| 11 |
332-70201-0 |
* CLAMP |
| 12 |
3KZ-70177-0 |
FUEL TANK ASSY 25L |
| 13 |
3RS-70020-0 |
* FUEL TANK CAP ASSY |
| 14 |
3RS-70021-0 |
** TANK FILLER CAP GASKET |
| 15 |
3E0-70270-0 |
* QUICK-CONNECTOR (MALE) |
| 16 |
3AC-70157-0 |
* FUEL PICK-UP ASSY W/GAUGE |
| 17 |
3AC-70140-0 |
* SCREW |
| 18 |
3AC-70145-0 |
* WASHER |
| 19 |
3AC-70150-0 |
* GASKET |
▶Fig.28 ACCESSORIES (10 parts)
| Ref |
OEM Part # |
Part Name |
| 12 |
3C8-72100-1 |
TOOL KIT |
| 29 |
3B7-60007-0 |
FLUSHING PLUG |
| 30 |
3B7-72530-2 |
TACHOMETER ASSY |
| 31 |
3B7-72659-0 |
* METER BULB 12V-1.7W |
| 32 |
3B7-72656-0 |
* METER DAMPER |
| 33 |
3B7-72661-0 |
* FITTING PLATE |
| 34 |
930103-0500 |
* NUT |
| 35 |
941303-0500 |
* SPRING WASHER |
| 36 |
361-72539-0 |
TACHOMETER LEAD WIRE L=6000 |
| 37 |
361-72543-0 |
SEPARATE CORD |
▶Fig.32 OPTIONAL PARTS (5) (2 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3C8-76160-3 |
RECTIFIER KIT |
| 2 |
921503-7625 |
* SCREW |
▶Fig.33 ASSEMBLY・KIT PARTS (11 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3TWQ87304-1 |
LOWER UNIT ASSY (UL) |
| 2 |
922503-6410 |
* SCREW |
| 3 |
3C8-87121-C |
POWER HEAD GASKET SET |
| 4 |
9101E3-5855 |
* BOLT |
| 5 |
3Z5-65238-1 |
* PUMP CASE LINER |
| 6 |
3T5-87321-3 |
LOWER UNIT GASKET SET |
| 7 |
921503-7625 |
* SCREW |
| 8 |
3TWJ87090-1 |
ENGINE SHORT BLOCK KIT |
| 9 |
951407-0312 |
* SPRING PIN 3-12 |
| 10 |
3LC-00090-0 |
* NEEDLE ROLLER SET |
| 11 |
3TW-83880-0 |
REMOTE CONTROL FITTING ASSY |
100-Hour / Annual Service Checklist
Regular maintenance keeps your Tohatsu MX40/50D3 running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.
- Replace water pump impeller and inspect wear plate
- Inspect and clean carburetor(s); check fuel mixture settings
- Replace spark plugs and check ignition timing
- Drain and refill lower unit gear oil; inspect for water contamination
- Inspect fuel lines, primer bulb, and fuel filter for deterioration
- Check and replace sacrificial anodes (zinc or aluminum)
- Inspect propeller for damage; check shaft seal and cotter pin
- Decarbonize exhaust ports and piston crown if needed
- Lubricate all grease points (steering, tilt tube, shift linkage)
- Inspect control cables and throttle/shift linkage for smooth operation
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Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
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Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.
