Tohatsu MD30B2 Troubleshooting
| Engine Model: Tohatsu MD30B2 |
| Engine Type: 2-stroke 3-cylinder gasoline outboard engine |
| Total Displacement: 42.5 cu.in (697 cc) |
| Rated Engine Power: 30 Hp (22.1 kW) at 5850 rpm |
| Fuel System: Two stroke low pressure direct injection (TLDI) |
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| Engine starts hard or won't start |
Empty fuel tank - Fill it up.
Wrong fuel grade - Use correct fuel grade.
Fuel system clogged - Repair or replace.
Defective wiring connection of spark plug - Inspect the spark plug wire connection, replace or repair.
Spark plug is damaged - Replace spark plug.
Fuel filter is plugged - Replace fuel filter.
Dirty fuel lines - Fuel lines must be clean.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Air pressure is low - Check air system components.
Wiring harness connections are damaged - Check electrical wire harness connections.
Damaged ignition system - Replace defective components.
Fuel feed pump is defective - Replace fuel feed pump.
Fuel injector is damaged or dirty - Clean or replace as required.
ECM failure - Install new ECM.
Damaged or worn fuel reed valve - Install new reed valve.
| Engine stops after starting |
Damaged spark plug - Install new spark plug.
Damaged ignition coil - Ignition coil should be replaced.
Defective fuel pump - Fuel pump need to be replaced.
Fuel system is dirty - Service fuel system.
Fuel filter is plugged - Replace or clean filter.
Defective ignition system - Test ignition and replace failed parts.
Defective spark plug - Change spark plug as required.
Fuel pump is faulty or clogged - Service or replace fuel pump.
Low air pressure - Check air system components.
Dirt in the fuel lines - Clean fuel system lines.
Dirty fuel filter - Replace or clean fuel filter.
Direct injector is defective - Replace as required.
Engine overloaded - Reduce engine load.
Ignition timing is improper - Adjust ignition timing correctly.
Defective thermostat - Replace thermostat.
Water pump is defective - Replace water pump.
Propeller selection improperly - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is positioned too low or too high - Position the engine correctly.
Stale gasoline - Change gasoline.
Engine overload - Load reducing required.
Low idle speed set incorrectly - Need to adjust idle speed.
Dirty or damaged fuel pump - Clean or replace fuel pump.
Crankshaft or main bearings failure - Change defective components as required.
Damaged piston rings or cylinder bore - Change faulty components.
| Engine power is insufficient |
Fuel pump is faulty or clogged - Service or change fuel pump.
Ignition system is defective - Check ignition and replace faulty components.
Powerhead parts are damaged - Replace defective parts.
Low fuel pressure - Inspect low pressure fuel pump or inspect fuel system for leaks.
Low air pressure - Normalize air pressure.
Compression is insufficient - Correct it.
Fuel delivery problem - Check and repair.
Fuel regulator is leaking - Leak must be repaired.
Fuel filter is dirty - Change fuel filter.
Dirty or faulty fuel injector - Replace or clean if necessary.
Manifold is leaking - Leak must be repaired.
Propeller pitch or diameter incorrect - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Outboard engine mounting height improperly - Adjust the engine to correct transom height.
Incorrect trim angle - Adjust trim angle.
| Engine using too much gasoline |
Faulty or loose spark plug - Spark plug need to be replaced or tightened.
Sleeve, piston, or rings are damaged - Replace defective parts.
Excessive engine load - Reduce load.
Clogged or defective fuel injectors - Inspect fuel injectors and change as required.
| Excessive motor vibration |
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Damaged or loose steering pivot - Tighten correctly or replace.
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
