Mitsubishi L3A Troubleshooting
| Engine Model: Mitsubishi L3A |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 42.5 cu.in (0.69 L) |
| Rated Engine Power: 17 Hp (13 kW) at 2700 rpm |
| Fuel System Type: Indirect injection |
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| Engine hard to start or will not start |
Fuel filter element is dirty - Replace the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Damaged fuel injection pump - Replacement or repair required.
Valve timing is out of adjustment - Adjust or replace timing gear.
Fuel pipes clogging - Service fuel pipes.
Unadjusted injection timing - Adjust according to specifications.
Cylinder or piston rings are worn - Replace faulty parts.
| Diesel starts and suddenly stops |
Fuel filter element is dirty - Clean or replace the filter.
Damaged fuel injection pump - Repair or change injection pump.
Dirty air cleaner - Air filter maintenance required.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stops unexpectedly during operation |
Fuel injection timing is not adjusted - Use the correct fuel injection pump timing adjustment.
Fuel filter plugged - Install new filter element.
Low coolant temperature - Warm up the engine.
Stuck or burnt injection nozzle - Change or repair injection nozzles.
Incorrectly adjusted low idle speed - Adjust as required.
The valve clearance is not adjusted - Adjust valve clearance.
Faulty fuel injection pump - Install a new fuel pump or repair.
Clogged injection nozzle - If necessary, replace with a new nozzle.
Fuel lines or hoses are clogged - Fuel lines and hoses need to be cleaned.
Plugged air filter - Change air filter element.
Cylinder head gasket defective - Change cylinder head gasket.
Improper injection timing - Set up as recommended.
Faulty fuel injection pump - Rebuild or install a new injection pump.
One of moving engine parts has broken - Repair or replace defective parts.
Radiator fins are clogged or radiator cap is faulty - Change cap or clean radiator.
Not enough coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is loose or defective - Belt replacement is recommended.
Engine oil insufficient - Fill the crankcase with engine oil.
Cylinder head gasket defective - Replace the gasket as required.
Improper injection timing - Set the injection timing correctly.
Engine oil level low - Fill the crankcase with oil.
Oil pump malfunction - Install a new pump.
Oil filter element is dirty - Replace or service engine oil filter.
Relief valve is seized or worn - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
| Excessive oil consumption |
Oil leaks: Seals or gaskets are defective - To repair leaks, replace worn parts.
Improper oil viscosity - Use correct viscosity oil.
Stuck or defective piston rings - Replace piston rings.
Damaged valve stems or valve guides - Valves need to be changed.
Scuffed cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary.
Engine is not preheated - Warm up engine as required.
Low engine oil level - Check and refill engine oil.
Improper fuel injection timing - Set up as recommended.
Piston wear or scoring - Pistons replacement required.
Connecting rod failure or misalignment - Connecting rod needs to be replaced or aligned.
Battery voltage is low - Low battery charging, charge as required.
Battery discharges quickly - Service charging system or replace battery.
Battery terminals are corroded or wires are disconnected - Connect wires properly or change terminals.
| Starter motor is not working |
Battery is drained or defective - Charge or change the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output voltage - Charge the battery.
Starter motor failing - Starter should be replaced.
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