Mitsubishi 6D20 Troubleshooting
| Engine Model: Mitsubishi 6D20 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 629 cu.in (10.3 L) |
| Rated Engine Power: 212 Hp (158 kW) at 2500 rpm |
| Fuel System Type: Direct injection |
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| Engine starts hard or will not start |
Dirty fuel filter - Replace the filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are faulty or clogged - Test injection nozzles and change if necessary.
Fuel injection pump is defective - Install a new pump or rebuild.
Valve timing is out of adjustment - Set the valve timing correctly.
Fuel pipes clogging - Clean or change fuel pipes.
Injection timing is incorrect - Set up as recommended.
Excessive wear of piston rings and cylinder - Change defective parts.
| Engine starts but stalls suddenly |
Fuel filter element is clogged - Service or replace the filter.
Fuel injection pump is faulty - Change or repair the pump.
Clogged air cleaner - Clean air cleaner element.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine stalls while running |
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Fuel filter element clogging - Replace the filter element.
Coolant temperature is low - Warm up engine as required.
Stuck or clogged injection nozzle - Change or repair injection nozzles.
| Engine shuts off while idling |
Incorrect low idle setting - Correct low idle settings.
Valve clearance is wrong - Check and adjust.
Defective fuel injection pump - Rebuild or replace pump.
Faulty or dirty injection nozzles - Check injection nozzles and replace if required.
Dirt in the fuel hoses or lines - Service fuel hoses and lines.
Plugged air filter - Service air cleaner.
Cylinder-head gasket is broken - Gasket should be replaced.
Improper injection timing - Adjust according to specifications.
Faulty fuel injection pump - Replacement or repair required.
One of moving engine parts is faulty - Change or repair damaged parts.
Clogged radiator fins or leaking radiator cap - Install new cap or clean radiator.
Low engine coolant - Top up coolant fluid and check system for leaks.
Excessive wear of the fan belt - Fan belt must be replaced.
Insufficient engine oil - Need to add engine oil.
Cylinder head gasket is worn - Replace cylinder head gasket.
Wrong injection timing - Use correct injection timing adjustment.
Engine oil insufficient - Check and refill the oil.
Oil pump is defective - Install a new pump.
Engine oil filter is plugged - Clean or replace engine oil filter element.
Stuck or defective relief valve - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Inspect and replace or repair faulty parts.
| Diesel engine consuming too much oil |
Oil leaks: Seals or gaskets are wearing excessively - Defective components must be replaced.
Oil viscosity is incorrect - Use proper viscosity oil.
Piston rings are defective or worn - Have piston rings replaced.
Worn valve stems and valve guides - Change the valves.
Scored cylinder liners or pistons - Check liners and pistons, install new components as required.
| Abnormal engine noise or knocking |
Low coolant temperature - Normalize the temperature by warming up the engine.
Engine oil level low - Need to add engine oil.
Improper setting of fuel injection pump timing - Set it up as required.
Scored or worn pistons - Replace the pistons as required.
Connecting rod is misaligned or worn - Need to change or align the connecting rod.
| Starter motor cranks slow |
Low battery voltage - Battery is drained, recharge it.
Battery is not holding charge - Service charging system or replace battery.
Disconnected cables or faulty battery terminals - Check battery wires and service or replace terminals.
Battery is low or faulty - Charge or replace the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery output voltage - Battery needs to be recharged.
Defective starter motor - Change or repair starter.
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