Mitsubishi 6D40 Troubleshooting
| Engine Model: Mitsubishi 6D40 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 733.7 cu.in (12.02 L) |
| Rated Engine Power: 330-390 Hp (243-287 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or will not start |
Fuel filter plugged - Clean or change the filter.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - Service or change injection nozzles.
Fuel injection pump is not operating properly - Replace or rebuild injection pump.
Unadjusted valve timing - Use correct valve timing adjustment.
Fuel pipes are plugged - Service fuel pipes.
Injection timing is out of adjustment - Check injection timing adjustment.
Piston rings and cylinder are worn - Replace faulty parts.
| Engine starts but then stops |
Clogged fuel filter - Change filter element.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.
Air filter element clogged - Clean or replace the element.
Improper nozzle opening pressure - Set up as recommended.
| Engine stops unexpectedly during operation |
Improper fuel injection timing - Adjust fuel injection pump as required.
Clogged fuel filter - Replace the filter element.
Engine not warmed up - Warm up engine as required.
Stuck or burnt injection nozzle - Clean or replace injection nozzles.
| Engine stops at low idle speed |
Low idle speed setting is incorrect - Test and adjust.
The valve clearance is not adjusted - Check and adjust.
Damaged fuel injection pump - Rebuild or install a new injection pump.
Fuel injection nozzles are damaged - Install a new kit of correctly balanced nozzles.
Clogged fuel lines or hoses - Fuel hoses and lines must be clean.
Dirty air filter - Clean or change.
Cylinder head gasket is blown - Change cylinder head gasket.
Injection timing is out of adjustment - Adjust according to specifications.
Fuel injection pump is broken - Replace or rebuild injection pump.
One of moving engine components has failed - Change or repair damaged parts.
Radiator core is dirty or radiator cap is damaged - Change cap or clean radiator.
Not enough coolant - The cooling system needs to be refilled and checked for faults.
Fan belt is loose or defective - Change as required.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder head gasket is worn - Replace the gasket as required.
Injection timing is wrong - Set the injection timing correctly.
Low oil level - Fill up the engine oil.
Worn oil pump - Repair or replace.
Oil filter clogging - Change or clean engine oil filter element.
Worn or dirty relief valve - Relief valve need to be replaced or cleaned.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty parts.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
| Diesel engine consuming too much oil |
Oil leaking: Worn seals or gaskets - Install new components.
Improper oil viscosity - Use oil of proper viscosity.
Stuck or worn piston rings - Have piston rings replaced.
Valve stems and guides are worn - Replace the valves.
Scuffed pistons or cylinder liners - Inspect liners and pistons, change as necessary.
| Abnormal engine knocking or noise |
Low coolant temperature - Warm up the engine.
Not enough engine oil - Check oil level and add oil as required.
Improper setting of fuel injection pump timing - Set up as recommended.
Worn or broken pistons - Replace the pistons as required.
Connecting rod failure or misalignment - Need to align or replace the connecting rod.
Low battery output voltage - Recharge the battery.
Battery will not hold charge - Service or replace the battery.
Corroded battery terminals or disconnected wires - Check cable connections and change or clean terminals.
Battery is drained or worn - Recharge or replace battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery output voltage - Charge the battery.
Defective starter motor - Starter needs to be replaced.
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