Mitsubishi S4E Troubleshooting
| Engine Model: Mitsubishi S4E |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 159.3 cu.in (2.61 L) |
| Rated Engine Power: 49.3 Hp (36.8 kW) at 2400 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine difficult to start or will not start |
Fuel filter plugged - Clean or replace the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Defective or clogged injection nozzle - Install a new kit of correctly balanced nozzles.
Defective fuel injection pump - Change pump or rebuild it.
Valve timing is improper - Correct or replace timing gear.
Restricted fuel pipes - Clean fuel pipes.
Injection timing is incorrect - Adjust injection timing as required.
Worn cylinder or piston rings - Change faulty parts.
| Engine starts but then stops |
Fuel filter plugged - Clean the filter element.
Fuel injection pump is damaged - Replace or repair injection pump.
Clogged air filter element - Air filter maintenance required.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stalls after running |
Fuel injection timing is wrong - Use the correct fuel injection pump timing adjustment.
Fuel filter plugging - Install new filter element.
Coolant temperature is low - Warm up to required temperature.
Stuck or burnt injection nozzle - Repair or change injection nozzles.
| Engine shuts off while idling |
Incorrectly adjusted low idle speed - Adjustment required.
Valve clearance is out of adjustment - Adjust valve clearance according to specifications.
Fuel injection pump failure - Install a new fuel pump or repair.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Fuel lines or hoses are dirty - Clean fuel hoses and lines.
Restricted intake air - Clean or change the filter.
Leaking cylinder head gasket - Replace cylinder head gasket.
Injection timing is wrong - Use correct injection timing adjustment.
Fuel injection pump failure - Replace or repair injection pump.
One of moving engine parts is faulty - Change or repair damaged parts.
Defective radiator cap or clogged radiator fins - Replace cap or clean radiator.
Not enough coolant - Fill radiator to proper level and check components for faults.
Fan belt slipping or worn - Install new fan belt.
Lack of engine oil - Checking oil level and add if necessary.
Damaged cylinder-head gasket - Install a new gasket.
Improper injection timing - Adjust as recommended.
Low oil level - Checking oil level and add if necessary.
Oil pump malfunction - Check and replace if necessary.
Engine oil filter is plugged - Change or clean engine oil filter element.
Stuck or worn relief valve - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Check and change or repair defective parts.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
| Engine oil consumption is too high |
External oil leaks: Defective seals or gaskets - Defective components must be replaced.
Wrong oil viscosity - Use proper viscosity oil.
Damaged or seized piston rings - Install new piston rings.
Damaged valve stems or valve guides - Need to replace the valves.
Pistons or cylinder liners are damaged - Check liners and pistons, replace as required.
Low coolant temperature - Engine is not warmed up to the required temperature.
Not enough engine oil - Fill up the oil to required level.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Worn or broken pistons - Install new pistons.
Connecting rod is misaligned or defective - Replace or align connecting rod.
Battery power is low - Battery is drained, recharge it.
Battery discharges quickly - Service or change the battery.
Faulty battery terminals or disconnected cables - Connect wiring properly or install new terminals.
| Starter motor is not working |
Battery is drained or defective - Need to charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery capacity is low - Recharge the battery.
Starter motor failing - Replace or repair starter.
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