Mitsubishi L3C Troubleshooting
| Engine Model: Mitsubishi L3C |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 49.3 cu.in (0.81 L) |
| Rated Engine Power: 16 Hp (12 kW) at 2700 rpm |
| Fuel System Type: Indirect injection |
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| Engine starts up hard or will not start |
Fuel filter plugged - Service or replace the filter.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Fuel injection pump failure - Repair or install new pump.
Valve timing is improper - Correct or replace timing gear.
Fuel pipes are dirty - Service fuel pipes.
Wrong injection timing - Set up as recommended.
Cylinder or piston rings are worn - Replace faulty parts.
Fuel filter element is clogged - Change the filter element.
Fuel injection pump is damaged - Change pump or rebuild it.
Clogged air cleaner - Carry out maintenance on air filter.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine stalls while running |
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Fuel filter plugged - Clean or change the filter.
Engine is not preheated - Warm up to required temperature.
Injection nozzles are stuck or clogged - Service or change injection nozzles.
Incorrect low idle speed adjustment - Adjust low idling as recommended.
The valve clearance is not adjusted - Need to adjust valve clearance.
Fuel injection pump is defective - Repair or install new pump.
| Diesel engine loses power |
Fuel injection nozzles fault - Change fuel injection nozzles.
Dirty fuel lines or hoses - Fuel lines and hoses need to be cleaned.
Plugged air filter - Carry out maintenance on air filter.
Cylinder head gasket defective - Change cylinder head gasket.
Incorrect injection timing - Use correct injection timing adjustment.
Fuel injection pump is damaged - Replace injection pump or repair it.
One of moving engine components has failed - Replace or repair damaged components.
Clogged radiator core or leaking radiator cap - Clean radiator or install new cap.
Low engine coolant - The cooling system needs to be refilled and checked for faults.
Fan belt slipping or worn - Install new fan belt.
Engine oil level low - Add oil to the engine crankcase.
Defective cylinder head gasket - Replace cylinder head gasket.
Injection timing is out of adjustment - Set up as recommended.
Insufficient engine oil - Checking oil level and add if necessary.
Oil pump is worn or damaged - Repair or change.
Oil filter element is dirty - Clean or change engine oil filter.
Stuck or worn relief valve - Change or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Inspect and change or repair worn components.
| Excessive oil consumption |
Oil leaks: Damaged seals or gaskets - Worn parts need to be replaced.
Incorrect oil viscosity - Use correct viscosity oil.
Seized or wear piston rings - Change the piston rings as required.
Valve stems and guides are worn - Valves replacement required.
Pistons or cylinder liners are scored - Check pistons and liners, replace as required.
Low coolant temperature - Normalize the temperature by warming up the engine.
Not enough engine oil - Checking oil level and add if necessary.
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.
Pistons are broken or worn - Have pistons replaced.
Connecting rod failure or misalignment - Align or change connecting rod.
| Starter motor cranks slow |
Low battery output - Battery is drained, recharge it.
Battery drains quickly - Service or replace the battery.
Wires are disconnected or battery terminals are corroded - Connect wires correctly or change terminals.
Battery is discharged or worn - Replace or charge as required.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output - Recharge the battery.
Defective starter motor - Starter needs to be replaced.
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