Mitsubishi S4S-DT Troubleshooting
| Engine Model: Mitsubishi S4S-DT |
| Engine Type: 4-cycle inline 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 203.3 cu.in (3.33 L) |
| Rated Engine Power: 83 Hp (62 kW) at 2500 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine difficult to start or won't start |
Clogged fuel filter - Clean the filter or install new filter element.
Air in the fuel lines - Bleed the fuel lines.
Defective injection nozzle - Check and replace nozzles if required.
Fuel injection pump damage - Rebuild or replace pump.
Improper valve timing - Set the valve timing correctly.
Dirty fuel pipes - Clean or replace fuel pipes.
Injection timing is improper - Adjust injection timing as required.
Cylinder or piston rings are worn - Change faulty parts.
| Engine starts but stalls suddenly |
Fuel filter plugging - Change the filter element.
Fuel injection pump is broken - Repair or change injection pump.
Clogged air filter element - Carry out maintenance on air filter.
Improper nozzle opening pressure - Adjust as required.
| Diesel shuts off while driving |
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Fuel filter element is clogged - Service the filter.
Low coolant temperature - Warm up engine as required.
Injection nozzles sticking or clogged - Repair or change injection nozzles.
Incorrect low idle speed adjustment - Normalize low idle speed.
Incorrect valve clearance - Correct valve clearance.
Fuel injection pump is damaged - Rebuild or change fuel pump.
| Engine is not running at maximum power |
Fuel injection nozzles are clogged or faulty - Change fuel injection nozzles.
Dirt in the fuel lines or hoses - Fuel hoses and lines must be clean.
Air filter is clogged - Carry out maintenance on air filter.
Worn cylinder head gasket - Replace cylinder head gasket.
Injection timing is incorrect - Adjust injection timing as required.
Faulty fuel injection pump - Repair or replace injection pump.
One of moving engine parts is faulty - Change or repair damaged parts.
Radiator core is clogged or radiator cap is leaking - Change cap or clean radiator.
Low coolant level - The cooling system needs to be refilled and checked for faults.
Excessive wear of the fan belt - Belt replacement is recommended.
Engine oil insufficient - Checking oil level and add if necessary.
Damaged cylinder-head gasket - Replace the gasket as required.
Incorrect injection timing - Adjust as recommended.
Engine oil insufficient - Fill the crankcase with oil.
Worn oil pump - Inspect and change as required.
Clogged oil filter element - Clean or change engine oil filter.
Relief valve is stuck or worn - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
| Engine using too much oil |
Oil leaking: Seals or gaskets are defective - Replace to repair leaks.
Improper oil viscosity - Fill up with the correct oil viscosity.
Damaged or seized piston rings - Piston rings replacement required.
Damaged valve stems or valve guides - Valves need to be changed.
Pistons or cylinder liners are scuffed - Check pistons and liners, change as required.
Coolant temperature is low - Warm up to required temperature.
Engine oil level low - Fill up the engine oil.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Pistons are worn or scored - Install new pistons.
Connecting rod is worn or not aligned - Connecting rod needs to be aligned or changed.
Low battery output - Battery needs to be recharged.
Battery discharges quickly - Service charging system or install new battery.
Bad terminals or disconnected battery cables - Connect wiring correctly or install new terminals.
| Starter motor is not working |
Battery is drained or worn - Change or recharge battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery voltage is low - Recharge the battery.
Defective starter motor - Replace or repair starter.
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