Mitsubishi 6D24 Troubleshooting
| Engine Model: Mitsubishi 6D24 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 729 cu.in (11.95 L) |
| Rated Engine Power: 200 to 350 Hp (149-261 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Diesel hard to start or doesn't start |
Clogged fuel filter - Clean or change the filter.
There is air in the fuel system - Bleed the system.
Clogged or burnt injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pump is not operating properly - Change pump or rebuild it.
Wrong valve timing - Adjust or change timing gear.
Fuel pipes clogging - Clean fuel pipes.
Wrong injection timing - Adjust as recommended.
Damaged piston rings and cylinder - Replace faulty parts.
| Diesel starts but stalls suddenly |
Fuel filter plugged - Clean or change the filter.
Fuel injection pump is defective - Repair or install a new fuel pump.
Air filter plugged - Clean or change.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine shuts off while running |
Wrong setting of fuel injection pump timing - Adjust according to specifications.
Fuel filter element clogging - Clean the filter or install new filter element.
Engine is not fully warmed up - Warm up the engine.
Injection nozzles sticking or clogged - Repair or replace injection nozzles.
Too low idle RPM - Adjust the low idle speed.
Valve clearance is out of adjustment - Adjust to proper valve clearance.
Faulty fuel injection pump - Repair or install a new fuel pump.
Defective or clogged injection nozzle - Install a new kit of correctly balanced nozzles.
Fuel lines or hoses are clogged - Fuel lines and hoses need to be cleaned.
Air filter is dirty - Replace air filter element.
Leaking cylinder head gasket - Replace the gasket as required.
Wrong injection timing - Set up as recommended.
Faulty fuel injection pump - Replace or repair injection pump.
One of moving engine parts has broken - Repair or replace defective components.
Clogged radiator fins or damaged radiator cap - Clean radiator or change cap.
Coolant level is low - Top up coolant fluid and check system for leaks.
Damaged or worn fan belt - Belt change is required.
Engine oil insufficient - Fill up the engine oil.
Cylinder head gasket is defective - Gasket should be replaced.
Improper injection timing - Adjust injection timing as required.
| Oil pressure is insufficient |
Insufficient engine oil - Check oil level and add oil as required.
Oil pump is damaged - Replace as required.
Clogged oil filter - Clean or replace engine oil filter element.
Relief valve is stuck or worn - Change or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and change or repair worn components.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty components.
| Excessive oil consumption |
Oil leakage: Damaged gaskets or seals - Install new components.
Incorrect oil viscosity - Use proper viscosity oil.
Piston rings are defective or worn - Change piston rings.
Worn valve guides and valve stems - Replace defective valves.
Damaged pistons or cylinder liners - Check pistons and liners, install new parts as required.
| Abnormal engine knocking or noise |
Engine is not fully warmed up - Warm up engine as required.
Not enough engine oil - Fill up the engine oil.
Fuel injection pump timing is wrong - Adjust as recommended.
Worn or broken pistons - Install new pistons.
Connecting rod misalignment or failure - Need to align or replace the connecting rod.
Battery power is low - Battery is drained, recharge it.
Battery does not hold charge - Battery needs service or replacement.
Wires are disconnected or battery terminals are corroded - Check battery wires and service or replace terminals.
| Starter motor is not working |
Battery is discharged or defective - Recharge or replace battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery capacity - Charge the battery.
Starter motor failing - Replace or repair starter.
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