Mitsubishi 6D14T Troubleshooting
| Engine Model: Mitsubishi 6D14T |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 400 cu.in (6.56 L) |
| Rated Engine Power: 138-195 Hp (103-143 kW) at 2800 rpm |
| Fuel System Type: Direct injection |
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| Engine starts hard or doesn't start |
Fuel filter element is clogged - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Dirty or damaged injection nozzles - Inspect nozzles and replace if necessary.
Faulty fuel injection pump - Rebuild or replace pump.
Improper valve timing - Use correct valve timing adjustment.
Fuel pipes are plugged - Clean fuel pipes.
Incorrect injection timing - Set up as recommended.
Cylinder or piston rings are worn - Replace faulty parts.
| Engine starts and then shuts off |
Fuel filter element clogging - Filter maintenance required.
Fuel injection pump is not working correctly - Change pump or rebuild it.
Air filter is dirty - Air filter maintenance required.
Improper nozzle opening pressure - Set up as recommended.
| Diesel shuts off while driving |
Fuel injection timing is not adjusted - Adjust fuel injection pump as required.
Fuel filter plugging - Service the filter.
Low coolant temperature - Warm up the engine.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
| Engine stalls while idling |
Incorrectly adjusted low idle speed - Correct the settings.
Valve clearance is out of adjustment - Adjust valve clearance according to specifications.
Fuel injection pump is broken - Rebuild or replace pump.
Fuel injection nozzles are faulty or clogged - Check injection nozzles and replace if required.
Dirty fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Dirty air filter - Change air filter element.
Cylinder head gasket is defective - Install a new gasket.
Injection timing is out of adjustment - Set up as recommended.
Fuel injection pump is damaged - Rebuild or change fuel pump.
Any of moving engine parts is worn - Repair or replace defective components.
Clogged radiator fins or leaking radiator cap - Change cap or clean radiator.
Low coolant level - Top up coolant fluid and check system for leaks.
Fan belt slipping or worn - Replace the fan belt.
Engine oil level low - Fill up the engine oil.
Defective cylinder head gasket - Change cylinder head gasket.
Injection timing is improper - Adjust injection timing as required.
Low oil level - Fill up the engine oil.
Oil pump failure - Remove and inspect oil pump.
Plugged engine oil filter - Replace or clean engine oil filter element.
Relief valve is stuck or worn - Change or service relief valve.
Excessive crankshaft bearing clearance - Inspect and change or repair worn components.
Clearance of crankpin bearing is excessive - Check and replace or repair defective parts.
| Diesel engine consuming too much oil |
Oil leaks: Gaskets or seals may be damaged - Replace to repair leaks.
Crankcase oil too light - Use correct viscosity oil.
Piston rings are defective or worn - Have piston rings replaced.
Worn valve guides and valve stems - Change the valves.
Scuffed cylinder liners or pistons - Check pistons and liners, change as required.
Low coolant temperature - Warm up engine as required.
Not enough engine oil - Fill up the engine oil.
Wrong setting of fuel injection pump timing - Adjust as recommended.
Pistons are worn or broken - Replace the pistons as required.
Connecting rod is worn or misaligned - Align or change connecting rod.
Low battery output voltage - Recharge the battery.
Battery drains quickly - Service charging system or install new battery.
Battery terminals are corroded or wires are disconnected - Check cables and service or change terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery capacity - Charge the battery.
Starter motor is faulty - Starter should be replaced.
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