Mitsubishi 6D31T Troubleshooting
| Engine Model: Mitsubishi 6D31T |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 384 cu.in (6.29 L) |
| Rated Engine Power: 145-160 Hp (108-119 kW) at 2800 rpm |
| Fuel System Type: Direct fuel injection |
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| Diesel engine hard to start or doesn't start |
Fuel filter plugging - Filter maintenance required.
Air in fuel tank - Bleed fuel tank.
Faulty or dirty injection nozzles - Change fuel injection nozzles.
Fuel injection pump failure - Repair or replace injection pump.
Unadjusted valve timing - Set the valve timing correctly.
Restricted fuel pipes - Clean fuel pipes.
Injection timing is wrong - Use correct injection timing adjustment.
Damaged piston rings and cylinder - Change faulty components.
| Engine starts but immediately stalls |
Fuel filter plugged - Clean the filter element.
Fuel injection pump malfunction - Replace or rebuild injection pump.
Clogged air cleaner - Clean air cleaner element.
Nozzle opening pressure is improper - Set it correctly.
| Engine stalls during operation |
Fuel injection timing is wrong - Set it up as required.
Fuel filter plugging - Clean the filter or install new filter element.
Engine is not warmed up to the required temperature - Warm up engine as required.
Stuck or burnt injection nozzle - Change or repair injection nozzles.
| Engine stalls while idling |
Incorrect low idle speed adjustment - Adjust the low idle speed.
The valve clearance is not adjusted - Adjust valve clearance.
Fuel injection pump is defective - Repair or replace injection pump.
Fuel injection nozzles are damaged - Inspect nozzles and replace if necessary.
Clogged fuel hoses or lines - Clean fuel lines and hoses.
Air filter plugged - Change air filter element.
Blown cylinder head gasket - Replace the gasket as required.
Incorrect injection timing - Set up as recommended.
Faulty fuel injection pump - Repair or change injection pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or replace cap.
Low engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt slipping or worn - Change as required.
Engine oil level low - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Unadjusted injection timing - Adjust injection timing as required.
| Oil pressure is insufficient |
Engine oil insufficient - Checking oil level and add if necessary.
Worn oil pump - Replace as required.
Clogged oil filter - Clean or change engine oil filter.
Stuck or defective relief valve - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive oil clearance of crankpin bearing - Test and replace or repair worn components.
| Diesel engine using too much oil |
Oil leaks: Seals or gaskets are defective - Change worn parts according to specifications.
Crankcase oil too light - Fill up with the correct oil viscosity.
Damaged or seized piston rings - Change piston rings.
Damaged valve guides or valve stems - Valves must be replaced.
Worn cylinder liners or pistons - Inspect liners and pistons, change as necessary.
| Abnormal engine noise or knocking |
Engine is not preheated - Warm up the engine.
Lack of engine oil - Add oil to the engine crankcase.
Fuel injection pump timing is not adjusted - Set up as recommended.
Pistons are broken or worn - Replace the pistons.
Misaligned or defective connecting rod - Replace or align connecting rod.
Battery voltage is low - Recharge the battery.
Battery will not hold charge - Service charging system or replace battery.
Disconnected wires or corroded battery terminals - Connect cables correctly or replace terminals.
Battery is drained or defective - Recharge or replace battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery capacity - Low battery charging, charge as required.
Starter motor is damaged - Starter needs to be changed.
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