Mitsubishi S4F Troubleshooting
| Engine Model: Mitsubishi S4F |
| Engine Type: 4-cycle inline 4-cylinder liquid-cooled diesel |
| Total Displacement: 211 cu.in (3.45 L) |
| Rated Engine Power: 90-125 Hp (67-93 kW) at 2300 rpm |
| Fuel System Type: Direct injection |
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| Engine hard to start or won't start |
Dirty fuel filter - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Faulty or dirty injection nozzles - Clean or change injection nozzles.
Fuel injection pump is faulty - Install a new pump or rebuild.
Valve timing is wrong - Correct or replace timing gear.
Fuel pipes clogging - Clean or change fuel pipes.
Unadjusted injection timing - Adjust as recommended.
Damaged piston rings and cylinder - Change defective components.
| Diesel starts but stalls suddenly |
Clogged fuel filter - Replace filter element.
Fuel injection pump is not working correctly - Repair or install new pump.
Air filter clogged - Clean or replace element.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Diesel shuts off while driving |
Timing of fuel injection pump is incorrect - Adjust as recommended.
Fuel filter element clogging - Clean the filter or install new filter element.
Engine is not warmed up to the required temperature - Warm up the engine.
Stuck or burnt injection nozzle - Check injection nozzles and replace if required.
Incorrectly adjusted low idle speed - Adjustment required.
Valve clearance is wrong - Check and adjust.
Fuel injection pump is faulty - Install a new pump or rebuild.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Restricted fuel lines or hoses - Service fuel lines and hoses.
Clogged air filter - Replace air filter element.
Damaged cylinder-head gasket - Change cylinder head gasket.
Incorrect injection timing - Set the injection timing correctly.
Fuel injection pump is defective - Rebuild or replace pump.
One of moving engine components has failed - Repair or replace defective components.
Defective radiator cap or clogged radiator fins - Replace cap or clean radiator.
Lack of engine coolant - Refill to the correct level and inspect system for leaks.
Fan belt is broken or worn - Install new fan belt.
Low engine oil level - Fill the crankcase with engine oil.
Cylinder-head gasket is broken - Cylinder-head gasket replacement required.
Injection timing is incorrect - Use correct injection timing adjustment.
Low crankcase oil level - Check and refill the oil.
Oil pump is worn or damaged - Remove and inspect oil pump.
Oil filter clogged - Service or replace engine oil filter.
Worn or dirty relief valve - Change or service relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Engine consuming too much oil |
Oil leakage: Seals or gaskets are defective - Install new components.
Crankcase oil too light - Use proper viscosity oil.
Stuck or worn piston rings - Install new piston rings.
Valve guides and stems are worn - Valves must be replaced.
Damaged cylinder liners or pistons - Check pistons and liners, install new parts as required.
Low coolant temperature - Warm up engine as required.
Engine oil insufficient - Fill up the oil to required level.
Improper fuel injection timing - Adjust the pump as required.
Piston wear or scoring - Replace the pistons as required.
Connecting rod is worn or misaligned - Replace or align connecting rod.
Battery power is low - Battery is drained, charge it.
Battery won’t hold charge - Battery needs to be serviced or replaced.
Battery cables are disconnected or terminals are faulty - Connect wires properly or change terminals.
Battery is drained or defective - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output voltage - Charge the battery.
Starter motor failing - Replace or repair starter.
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