Mitsubishi 6D14 Troubleshooting
| Engine Model: Mitsubishi 6D14 |
| Engine Type: 4-cycle inline 6-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 399.5 cu.in (6.55 L) |
| Rated Engine Power: 135-155 Hp (100-116 kW) at 2800 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine difficult to start or won't start |
Fuel filter plugged - Filter maintenance required.
Air in fuel system - Bleed fuel system.
Dirty or faulty injection nozzles - Check and replace nozzles if required.
Fuel injection pump is damaged - Replace injection pump or repair it.
Incorrect valve timing - Adjust or replace timing gear.
Fuel pipes are dirty - Clean or change fuel pipes.
Improper injection timing - Set up as recommended.
Excessive wear of piston rings and cylinder - Replace faulty parts.
| Engine starts but immediately stalls |
Fuel filter element is dirty - Replace the filter element.
Defective fuel injection pump - Repair or replace injection pump.
Restricted intake air - Install new air filter element.
Nozzle opening pressure is improper - Adjust as recommended.
| Engine stalls after running |
Fuel injection timing is not adjusted - Adjust fuel injection pump as required.
Dirty fuel filter - Change the filter element.
Engine not warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Repair or change injection nozzles.
| Engine stalls while idling |
Low idle speed setting is not correct - Correct the settings.
Valve clearance is wrong - Check and adjust.
Defective fuel injection pump - Replace or repair injection pump.
| Diesel engine loses power |
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Fuel lines or hoses are clogged - Fuel hoses and lines must be clean.
Clogged air filter - Replace air filter element.
Leaking cylinder head gasket - Install a new gasket.
Wrong injection timing - Set up as recommended.
Fuel injection pump is defective - Repair or install a new fuel pump.
Any of moving engine components is faulty - Repair or replace defective parts.
Faulty radiator cap or dirty radiator fins - Clean radiator or change cap.
Insufficient coolant - Top up coolant fluid and check system for leaks.
Fan belt is broken or worn - Change as required.
Engine oil insufficient - Check oil level and add oil as required.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Injection timing is incorrect - Adjust injection timing as required.
Engine oil level low - Fill crankcase to proper oil level.
Oil pump is damaged - Replace as required.
Oil filter element is dirty - Change or clean engine oil filter element.
Relief valve is seized or worn - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive oil clearance of crankpin bearing - Inspect and replace or repair faulty parts.
| Excessive oil consumption |
External oil leaks: Worn gaskets or seals - Change to repair leaks.
Oil viscosity is incorrect - Use oil of correct viscosity.
Piston rings are seized or worn - Replace piston rings.
Worn valve guides and valve stems - Valves need to be changed.
Scored pistons or cylinder liners - Inspect pistons and liners, replace as required.
| Engine knocking sound or abnormal noise |
Low coolant temperature - Warm up the engine.
Engine oil level low - Check and refill engine oil.
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.
Broken or worn pistons - Replace the pistons as required.
Connecting rod is defective or not aligned - Align or replace connecting rod.
Low battery voltage - Recharge the battery.
Battery does not hold charge - Service battery or change it.
Bad battery terminals or disconnected wiring - Check wire connections and change or service terminals.
Battery is low or faulty - Need to charge or replace the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery power - Charge the battery.
Damaged starter motor - Repair or change starter.
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