Tohatsu M50D2 Troubleshooting
| Engine Model: Tohatsu M50D2 |
| Engine Type: 2-stroke 3-cylinder gasoline outboard engine |
| Total Displacement: 42.5 cu.in (697 cc) |
| Rated Engine Power: 50 Hp (37 kW) at 5500 rpm |
| Fuel System: Carburetor |
____________________________________________________________________________________
| Engine starts up hard or doesn't start |
Empty fuel tank - Add fuel.
Wrong fuel grade - Change gasoline.
Air or water in fuel system - Remove water or air from fuel system.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Faulty spark plug - Replace spark plug.
Fuel filter is plugged - Change fuel filter.
Carburetor is not working properly - Inspect and adjust.
Fuel lines clogging - Fuel lines need to be cleaned.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Replace or repair fuel pump.
Damaged or worn fuel reed valve - Install new reed valve.
| Engine starts and stops suddenly |
Spark plug is damaged - Install new spark plug.
Carburetor is dirty or faulty - Repair or clean carburetor.
Faulty ignition coil - Ignition coil should be replaced.
Fuel tank air vent clogged or closed - Open or clean air vent.
Fuel pump pressure is low - Change or rebuild fuel pump.
Ignition system failure - Check ignition and replace faulty components.
Fuel pump is faulty or clogged - Check fuel pump and change if required.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Fuel lines are dirty - Service fuel lines.
Closed or clogged fuel tank air vent - Open or clean air vent.
Plugged fuel filter - Fuel filter needs changing.
Gaskets are defective - Change gaskets.
Engine is running overloaded - Reduce the load.
Carburetor mixture is too lean - Make the correct settings.
Bad ignition timing - Ignition timing needs to be adjusted correctly.
Faulty thermostat - Thermostat need to be replaced.
Water pump failure - Replace water pump.
Incorrect propeller selection - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Outboard engine is mounted too high or too low - Position the engine correctly.
Low octane fuel - Use correct gasoline.
Engine is overloaded - Reduce the load.
Wrong adjustment of low idle speed - Need to adjust idle speed.
Fuel pump is damaged or dirty - Check fuel pump and change if required.
Worn main bearings or crankshaft - Crankshaft or bearings need to be replaced.
Worn piston rings or cylinder bore - Replace faulty parts.
Clogged or improperly adjusted carburetor - Clean or correctly adjust carburetor.
Dirty or defective fuel pump - Test fuel pump and replace if necessary.
Ignition system failure - Test ignition and replace failed parts.
Gaskets are damaged - Change gaskets.
Powerhead components are faulty - Replace defective components.
Propeller pitch or diameter incorrect - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Incorrect outboard motor mounting height - Have motor adjusted to proper transom height.
Trim angle is incorrect - Adjust trim angle correctly.
| Excessive fuel consumption |
Incorrect carburetor main jet adjustment - Adjust it properly.
Spark plug is defective or loose - Re-tighten or replace spark plug.
Sleeve, piston, or rings are damaged - Replace faulty components.
| Engine vibrates excessively |
Propeller bent or damaged - Replace propeller.
Propeller shaft damaged - Replace propeller shaft.
Weeds wraped around propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten or replace.
Battery power is low - Battery is drained, recharge it.
Battery is not holding charge - Service battery or change it.
Bad battery terminals or disconnected wiring - Connect wiring properly or install new terminals.
Starter motor is damaged - Repair or replace starter.
| Trim motor is running but trim system cannot move up or down |
Oil level is low - Fill up oil.
Defective pump assembly - Test pump and change if necessary.
Leakage of manual drain valve - Valve need to be closed or changed.
Pump driveshaft or motor damaged - Replace defective component.
| Trim does not fully up or down |
Pump assembly is faulty - Change pump as required.
Tilt ram piston ball is displaced - Service or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Not enough oil - Check and refill oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
