Mitsubishi S4L2 Troubleshooting
| Engine Model: Mitsubishi S4L2 |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 107.3 cu.in (1.76 L) |
| Rated Engine Power: 38.6 Hp (28.8 kW) at 3000 rpm |
| Fuel System Type: Direct or indirect fuel injection |
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| Engine hard to start or won't start |
Clogged fuel filter - Change the filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are damaged or dirty - Change fuel injection nozzles.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
Wrong valve timing - Set the valve timing correctly.
Restricted fuel pipes - Clean or change fuel pipes.
Unadjusted injection timing - Use correct injection timing adjustment.
Worn piston rings and cylinder - Replace faulty parts.
| Diesel starts and stalls immediately |
Dirty fuel filter - Change filter element.
Defective fuel injection pump - Rebuild or install a new injection pump.
Clogged air filter element - Service air cleaner.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine shuts off suddenly during operation |
Improper fuel injection timing - Adjust the pump as required.
Clogged fuel filter - Clean the filter element.
Engine is cold - Warm up engine as required.
Stuck or burnt injection nozzle - Repair or replace injection nozzles.
Low idle speed setting is incorrect - Correct the settings.
Valve clearance is out of adjustment - Need to adjust valve clearance.
Defective fuel injection pump - Rebuild or replace pump.
Fuel injection nozzles are damaged or dirty - Clean or replace injection nozzles.
Dirty fuel lines or hoses - Clean fuel system hoses and lines.
Intake air restriction - Clean or change.
Cylinder head gasket is worn - Install new cylinder head gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Faulty fuel injection pump - Repair or install new pump.
One of moving engine components has failed - Repair or replace defective components.
Clogged radiator fins or leaking radiator cap - Clean radiator or replace cap.
Lack of coolant in cooling system - Refill to the correct level and inspect system for leaks.
Excessive wear of the fan belt - If necessary, replace the belt.
Engine oil insufficient - Add oil to the engine crankcase.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Injection timing is out of adjustment - Adjust as recommended.
Low crankcase oil level - Check and refill the oil.
Oil pump failure - Repair or replace.
Dirty oil filter - Service or replace engine oil filter.
Relief valve is stuck or worn - Replace or service relief valve.
Crankshaft bearing clearance is excessive - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| Diesel engine using too much oil |
Oil leaks: Damaged seals or gaskets - Replace defective parts.
Crankcase oil too light - Use oil of proper viscosity.
Damaged or seized piston rings - Change piston rings.
Damaged valve guides or valve stems - Valves replacement required.
Cylinder liners or pistons are scuffed - Inspect pistons and liners, fit new components as necessary.
Coolant temperature is low - Warm up engine as required.
Engine oil insufficient - Check and refill engine oil.
Improper fuel injection timing - Adjust the pump as required.
Worn or scored pistons - Pistons replacement required.
Connecting rod is not aligned or defective - Replace or align connecting rod.
Low battery output voltage - Charge the battery.
Battery runs out quickly - Service battery or change it.
Wires are disconnected or battery terminals are corroded - Check wiring and clean or replace terminals.
Battery is drained or worn - Replace or charge as required.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output voltage - Battery is drained, recharge it.
Damaged starter motor - Repair or install a new starter.
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