Mitsubishi S3Q2 Troubleshooting
| Engine Model: Mitsubishi S3Q2 |
| Engine Type: 4-cycle inline 3-cylinder OHV forced-feed lubrication liquid-cooled diesel |
| Total Displacement: 114.7 cu.in (1.88 L) |
| Rated Engine Power: 31.3-40.5 Hp (23.3-30.2 kW) at 2400 rpm |
| Fuel System Type: Indirect fuel injection |
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| Engine starts up hard or doesn't start |
Fuel filter element clogging - Service or replace the filter.
Air in fuel system - Bleed fuel system.
Dirty or faulty injection nozzles - Clean or change injection nozzles.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
Valve timing is out of adjustment - Use correct valve timing adjustment.
Fuel pipes are dirty - Service or change fuel pipes.
Injection timing is wrong - Adjust as recommended.
Worn cylinder or piston rings - Change defective components.
| Diesel starts but immediately stops |
Fuel filter element is dirty - Service or replace the filter.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
Plugged air filter - Replace air filter element.
Improper nozzle opening pressure - Adjust as required.
| Engine shuts off suddenly during operation |
Timing of fuel injection pump is incorrect - Set the fuel pump timing correctly.
Fuel filter plugging - Replace filter element.
Engine is cold - Normalize the temperature by warming up the engine.
Injection nozzles are stuck or clogged - Clean or change injection nozzles.
Incorrect low idle setting - Adjust as required.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump is defective - Change or repair the pump.
| Diesel engine is losing power |
Dirty or damaged injection nozzles - Inspect nozzles and replace if necessary.
Fuel lines or hoses clogging - Fuel hoses and lines must be clean.
Plugged air filter - Air filter maintenance required.
Cylinder head gasket is blown - Replace the gasket as required.
Injection timing is wrong - Check injection timing adjustment.
Faulty fuel injection pump - Rebuild or change fuel pump.
One of moving engine parts has broken - Replace or repair damaged components.
Dirty radiator fins or faulty radiator cap - Install new cap or clean radiator.
Insufficient coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt is broken or worn - Change as required.
Lack of engine oil - Fill the crankcase with engine oil.
Cylinder head gasket is worn - Replace cylinder head gasket.
Improper injection timing - Adjust injection timing as required.
Not enough oil in the engine - Add oil to the engine crankcase.
Oil pump is damaged - Remove and inspect oil pump.
Oil filter element clogging - Replace or service engine oil filter.
Worn or dirty relief valve - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Inspect and change or repair worn components.
| High engine oil consumption |
Oil leaks: Gaskets or seals may be damaged - To repair leaks, replace worn parts.
Wrong oil viscosity - Fill up with the proper oil viscosity.
Stuck or defective piston rings - Have piston rings replaced.
Damaged valve stems or valve guides - Valves must be replaced.
Scuffed cylinder liners or pistons - Check pistons and liners, replace as required.
Engine is cold - Warm up the engine.
Not enough engine oil - Need to add engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
Scored or worn pistons - Pistons replacement required.
Faulty or misaligned connecting rod - Replace or align connecting rod.
Low battery output - Battery is drained, recharge it.
Battery is draining quickly - Service charging system or install new battery.
Faulty battery terminals or disconnected cables - Check wiring and clean or replace terminals.
Battery is drained or defective - Battery needs to be recharged or replaced.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery power is low - Battery is drained, recharge it.
Faulty starter motor - Starter should be replaced.
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