Mitsubishi 6D34 Troubleshooting
| Engine Model: Mitsubishi 6D34 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 358 cu.in (5.86 L) |
| Rated Engine Power: 168 Hp (125 kW) at 2150 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or doesn't start |
Fuel filter element is dirty - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Damaged fuel injection pump - Repair or install new pump.
Unadjusted valve timing - Correct or change timing gear.
Dirt in the fuel lines or hoses - Clean or change fuel pipes.
Improper injection timing - Check injection timing adjustment.
Excessive wear of piston rings and cylinder - Change faulty parts.
| Diesel starts and suddenly stops |
Fuel filter element is dirty - Install new filter element.
Fuel injection pump is not operating properly - Replace or repair injection pump.
Clogged air filter - Install new air filter element.
Incorrect nozzle opening pressure - Adjust as recommended.
| Diesel shuts off while driving |
Improper fuel injection timing - Adjust the pump as required.
Fuel filter element is dirty - Change filter element.
Engine not warmed up - Warm up engine as required.
Injection nozzles are stuck or clogged - Change or repair injection nozzles.
| Engine stalls when idling |
Incorrectly adjusted low idle speed - Adjust as required.
Improper valve clearance - Adjustment procedure required.
Fuel injection pump malfunction - Rebuild or replace pump.
Fuel injection nozzles are dirty or defective - Clean or replace injection nozzles.
Dirt in the fuel hoses or lines - Service fuel hoses and lines.
Dirty air cleaner - Change air filter element.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Improper injection timing - Check injection timing adjustment.
Fuel injection pump failure - Replace or repair injection pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Defective radiator cap or clogged radiator fins - Change cap or clean radiator.
Engine has a lack of coolant - Fill radiator to proper level and check components for faults.
Loose or defective fan belt - Belt change is required.
Low engine oil level - Check oil level and add oil as required.
Cylinder head gasket is damaged - Install a new gasket.
Incorrect injection timing - Adjust according to specifications.
Not enough oil in the engine - Fill up the engine oil.
Oil pump is damaged - Install a new pump.
Oil filter element clogging - Change or clean engine oil filter element.
Relief valve is stuck or worn - Relief valve need to be replaced or cleaned.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| Excessive oil consumption |
Oil leakage: Seals or gaskets are wearing excessively - To repair leaks, replace worn parts.
Incorrect oil viscosity - Fill up with the proper oil viscosity.
Piston rings are defective or worn - Install new piston rings.
Valve guides or stems are damaged - Change the valves.
Damaged pistons or cylinder liners - Inspect pistons and liners, fit new components as necessary.
| Abnormal engine knocking or noise |
Coolant temperature is low - Warm up the engine.
Insufficient engine oil - Fill up the oil to required level.
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Broken or worn pistons - Pistons replacement required.
Connecting rod is not aligned or worn - Connecting rod needs to be aligned or changed.
Battery capacity is low - Low battery charging, charge as required.
Battery discharges quickly - Service or replace the battery.
Battery terminals are corroded or wires are disconnected - Connect wires correctly or change terminals.
Battery is discharged or worn - Battery needs to be recharged or replaced.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery voltage - Battery is drained, recharge it.
Defective starter motor - Starter needs to be changed.
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