Mitsubishi 6D22T Troubleshooting
| Engine Model: Mitsubishi 6D22T |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 680.5 cu.in (11.2 L) |
| Rated Engine Power: 240-270 Hp (178-200 kW) at 2200 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine hard to start or will not start |
Fuel filter plugged - Clean the filter or install new filter element.
Air in fuel tank - Bleed fuel tank.
Defective injection nozzle - Replace injection nozzles.
Faulty fuel injection pump - Rebuild or install a new injection pump.
Improper valve timing - Adjust or change timing gear.
Fuel pipes clogging - Clean or replace fuel pipes.
Unadjusted injection timing - Set up as recommended.
Piston rings and cylinder are worn - Change faulty components.
| Engine starts but then stops |
Fuel filter element clogging - Service the filter.
Faulty fuel injection pump - Replacement or repair required.
Dirty air filter element - Clean or replace element.
Improper nozzle opening pressure - Set up as recommended.
| Diesel shuts off while driving |
Timing of fuel injection pump is incorrect - Set up as recommended.
Fuel filter plugging - Replace filter element.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Defective or stuck injection nozzles - Repair or change injection nozzles.
Low idle speed adjustment is incorrect - Adjustment required.
Improper valve clearance - Correct valve clearance needs to be set.
Fuel injection pump is not working correctly - Change or repair the pump.
Clogged injection nozzle - Replace injection nozzles.
Dirty fuel lines or hoses - Clean fuel system hoses and lines.
Dirty air filter - Clean or replace element.
Cylinder head gasket is worn - Install a new gasket.
Injection timing is wrong - Adjust according to specifications.
Faulty fuel injection pump - Replace injection pump or repair it.
Any of moving engine parts is worn - Repair or replace defective parts.
Radiator core is clogged or radiator cap is leaking - Replace cap or clean radiator.
Engine has a lack of coolant - Fill the cooling system and check components for leaks or other faults.
Fan belt is worn or faulty - The fan belt needs to be replaced.
Insufficient engine oil - Check oil level and add oil as required.
Cylinder head gasket is damaged - Gasket should be replaced.
Improper injection timing - Set up as recommended.
| Insufficient oil pressure |
Engine oil insufficient - Fill crankcase to proper oil level.
Oil pump is damaged - Check and replace if necessary.
Oil filter element is dirty - Change or clean engine oil filter element.
Relief valve is stuck or worn - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Engine oil consumption is too high |
Oil leaks: Gaskets or seals are excessively worn - Defective components must be replaced.
Oil viscosity is wrong - Use proper viscosity oil.
Damaged or seized piston rings - Piston rings replacement required.
Valve stems or guides are damaged - Valves need to be changed.
Scuffed pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
| Abnormal engine noise or knocking |
Low coolant temperature - Warm up the engine.
Not enough engine oil - Need to add engine oil.
Fuel injection pump timing is wrong - Set up as recommended.
Pistons are worn or scored - Pistons need to be replaced.
Connecting rod is misaligned or worn - Connecting rod must be aligned or replaced.
Low battery power - Battery is drained, recharge it.
Battery runs out quickly - Battery needs to be serviced or replaced.
Bad terminals or disconnected battery cables - Connect cables correctly or replace terminals.
Battery is discharged or defective - Need to charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery capacity - Battery is drained, charge it.
Starter motor failing - Starter should be changed.
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