Mitsubishi S4K-T Troubleshooting
| Engine Model: Mitsubishi S4K-T |
| Engine Type: 4-cycle inline 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 259.3 cu.in (4.25 L) |
| Rated Engine Power: 93-106 Hp (70-79 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Diesel hard to start or doesn't start |
Clogged fuel filter - Clean the filter or install new filter element.
Air in the fuel system - Air bleeding.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
Unadjusted valve timing - Adjust or change timing gear.
Restricted fuel pipes - Clean fuel pipes.
Wrong injection timing - Set the injection timing correctly.
Damaged piston rings and cylinder - Change defective components.
| Engine starts but stalls immediately |
Dirty fuel filter - Change filter element.
Fuel injection pump is defective - Replace or rebuild injection pump.
Dirty air filter - Air filter maintenance required.
Improper nozzle opening pressure - Adjust as recommended.
| Engine stops running suddenly |
Improper fuel injection timing - Adjust according to specifications.
Clogged fuel filter - Install new filter element.
Engine not warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Service or change injection nozzles.
| Engine shuts off while idling |
Incorrect low idle setting - Correct low idle adjustment.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump is broken - Replace or repair injection pump.
| Diesel engine loses power |
Fuel injection nozzles are clogged or faulty - Clean or change injection nozzles.
Dirt in the fuel lines or hoses - Service fuel lines and hoses.
Dirty air filter - Carry out maintenance on air filter.
Cylinder-head gasket is leaking - Replace cylinder head gasket.
Unadjusted injection timing - Adjust as recommended.
Fuel injection pump is defective - Replace or rebuild injection pump.
Any of moving engine parts is worn - Repair or replace defective components.
Radiator core is dirty or radiator cap is damaged - Clean radiator or replace cap.
Engine has a lack of coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is loose or defective - Install new fan belt.
Engine oil level is low - Checking oil level and add if necessary.
Cylinder-head gasket is broken - Gasket should be replaced.
Unadjusted injection timing - Set the injection timing correctly.
| Oil pressure is insufficient |
Engine oil level low - Add oil as required.
Oil pump malfunction - Repair or change.
Plugged engine oil filter - Service or replace engine oil filter.
Relief valve is stuck or worn - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Check and change or repair defective parts.
| Engine oil consumption is too high |
Oil leaking: Gaskets or seals can be faulty - New components need to be installed.
Oil viscosity is incorrect - Fill up with the correct oil viscosity.
Worn or stuck piston rings - Change piston rings.
Damaged valve guides or valve stems - Valves must be replaced.
Worn pistons or cylinder liners - Check pistons and liners, change as required.
Engine has not warmed up to the recommended temperature - Normalize the temperature by warming up the engine.
Lack of engine oil - Add oil to the engine crankcase.
Fuel injection pump timing is not adjusted - Set it up as required.
Worn or broken pistons - Pistons replacement required.
Misaligned or defective connecting rod - Need to change or align the connecting rod.
Low battery power - Battery needs to be recharged.
Battery is not holding charge - Service battery or replace it.
Battery cables are disconnected or terminals are faulty - Check cable connections and change or clean terminals.
Battery is discharged or defective - Need to charge or replace the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery voltage is low - Battery is drained, recharge it.
Damaged starter motor - Replace or repair starter.
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