Mitsubishi S3L Troubleshooting
| Engine Model: Mitsubishi S3L |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 68.6 cu.in (1.13 L) |
| Rated Engine Power: 20 Hp (14.9 kW) at 2400 rpm |
| Fuel System Type: Indirect fuel injection |
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| Engine difficult to start or will not start |
Clogged fuel filter - Service the filter.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are faulty or clogged - Service or change injection nozzles.
Fuel injection pump damage - Rebuild or change fuel pump.
Valve timing is wrong - Adjust or replace timing gear.
Fuel pipes are plugged - Service fuel pipes.
Incorrect injection timing - Adjust according to specifications.
Piston rings and cylinder are worn - Replace defective parts.
| Diesel starts but immediately shuts off |
Clogged fuel filter - Clean the filter or install new filter element.
Fuel injection pump is broken - Change or repair the pump.
Dirty air filter - Replace air filter element.
Nozzle opening pressure is incorrect - Adjust as required.
| Engine stops running suddenly |
Improper setting of fuel injection pump timing - Adjust the pump as required.
Fuel filter plugging - Clean the filter element.
Engine not warmed up - Warm up to required temperature.
Injection nozzles sticking or clogged - Service or change injection nozzles.
| Engine stops at low idle speed |
Low idle speed setting is incorrect - Correct the settings.
Improper valve clearance - Have it adjusted.
Damaged fuel injection pump - Rebuild or change fuel pump.
Dirty or faulty injection nozzles - Clean or change injection nozzles.
Restricted fuel lines or hoses - Clean fuel system hoses and lines.
Intake air restriction - Install new air filter element.
Cylinder head gasket is defective - Install a new gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Faulty fuel injection pump - Install a new fuel pump or repair.
One of moving engine parts has broken - Repair or replace defective parts.
Dirty radiator core or defective radiator cap - Clean radiator or install new cap.
Coolant level is low - Add coolant and check the components of cooling system.
Loose or damaged fan belt - Replace as required.
Not enough engine oil - Check and refill engine oil.
Cylinder-head gasket is leaking - Replace cylinder head gasket.
Injection timing is incorrect - Adjust according to specifications.
Oil level is insufficient - Add oil to the engine crankcase.
Defective oil pump - Install a new pump.
Engine oil filter is plugged - Service or replace engine oil filter.
Relief valve is stuck or worn - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty parts.
Excessive crankpin bearing clearance - Check and change or repair defective parts.
| High engine oil consumption |
Oil leaking: Worn gaskets or seals - Replace worn parts to avoid leaks.
Wrong oil viscosity - Use proper viscosity oil.
Stuck or worn piston rings - Change piston rings.
Valve guides or stems are damaged - Need to replace the valves.
Pistons or cylinder liners are scuffed - Check pistons and liners, replace as required.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Low engine oil level - Check and refill engine oil.
Improper fuel injection timing - Adjust fuel injection pump as required.
Scored or worn pistons - Pistons need to be replaced.
Connecting rod is defective or not aligned - Connecting rod needs to be replaced or aligned.
| Starter motor cranks slow |
Low battery voltage - Low battery charging, charge as required.
Battery won’t hold charge - Battery needs service or replacement.
Disconnected wires or corroded battery terminals - Connect wires properly or change terminals.
Battery is drained or defective - Replace or charge as required.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery capacity - Recharge the battery.
Damaged starter motor - Starter should be replaced.
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