Mitsubishi S4K Troubleshooting
| Engine Model: Mitsubishi S4K |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 259.3 cu.in (4.25 L) |
| Rated Engine Power: 83 Hp (62 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or won't start |
Fuel filter plugging - Change filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are dirty or defective - Clean or replace injection nozzles.
Fuel injection pump is not operating properly - Repair or change injection pump.
Improper valve timing - Correct or replace timing gear.
Restricted fuel pipes - Service or replace fuel pipes.
Incorrect injection timing - Check injection timing adjustment.
Worn cylinder or piston rings - Replace faulty parts.
| Diesel starts and stalls immediately |
Fuel filter plugging - Filter maintenance required.
Damaged fuel injection pump - Change or repair the pump.
Intake air restriction - Service air cleaner.
Incorrect nozzle opening pressure - Adjust as required.
| Engine stalls after running |
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Dirty fuel filter - Replace filter element.
Engine is not preheated - Warm up engine as required.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
Low idle speed set incorrectly - Correct low idle adjustment.
The valve clearance is not adjusted - Correct valve clearance.
Fuel injection pump damage - Replace or repair injection pump.
Faulty fuel injection nozzles - Change fuel injection nozzles.
Clogged fuel lines or hoses - Service fuel lines and hoses.
Air filter plugged - Air filter maintenance required.
Blown cylinder head gasket - Change cylinder head gasket.
Injection timing is incorrect - Set up as recommended.
Fuel injection pump is broken - Replacement or repair required.
One of moving engine components has failed - Replace or repair damaged components.
Defective radiator cap or clogged radiator fins - Change cap or clean radiator.
Not enough coolant - Add coolant and check the components of cooling system.
Loose or damaged fan belt - Replace as required.
Low engine oil level - Fill up the oil to required level.
Leaking cylinder head gasket - Change cylinder head gasket.
Incorrect injection timing - Check injection timing adjustment.
Lack of oil - Check and refill the oil.
Oil pump is worn or damaged - Install a new pump.
Clogged oil filter element - Service or replace engine oil filter.
Relief valve is seized or worn - Change or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty parts.
| Excessive engine oil consumption |
Oil leakage: Gaskets or seals may be damaged - Worn parts need to be replaced.
Wrong oil viscosity - Use proper viscosity oil.
Worn or stuck piston rings - Install new piston rings.
Valve stems and guides are worn - Replace defective valves.
Cylinder liners or pistons are worn - Inspect pistons and liners, replace as required.
Coolant temperature is low - Warm up the engine.
Low engine oil level - Check oil level and add oil as required.
Improper setting of fuel injection pump timing - Set it up as required.
Pistons are worn or broken - Replace the pistons.
Connecting rod is misaligned or defective - Need to replace or align the connecting rod.
Battery power is low - Charge the battery.
Battery does not hold charge - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Check wiring and clean or replace terminals.
| Starter motor is not working |
Battery is discharged or worn - Recharge or change battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery output voltage - Charge the battery.
Starter motor is defective - Replace or repair starter.
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