Mitsubishi 4DR6 Troubleshooting
| Engine Model: Mitsubishi 4DR6 |
| Engine Type: 4-cycle inline 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 162.3 cu.in (2.66 L) |
| Rated Engine Power: 93 Hp (69 kW) at 3500 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 in the fuel lines - Bleed the fuel lines.
Clogged injection nozzle - Replace injection nozzles.
Defective fuel injection pump - Replace or rebuild injection pump.
Valve timing is wrong - Correct or replace timing gear.
Fuel pipes are dirty - Clean or change fuel pipes.
Incorrect injection timing - Use correct injection timing adjustment.
Damaged piston rings and cylinder - Change faulty parts.
| Engine stalls after starting |
Fuel filter plugging - Clean or replace the filter.
Fuel injection pump malfunctioning - Replace or repair injection pump.
Air filter clogged - Carry out maintenance on air filter.
Improper nozzle opening pressure - Adjust as recommended.
| Engine stalls while running |
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.
Fuel filter element clogging - Clean or replace the filter.
Engine is cold - Warm up the engine.
Defective or stuck injection nozzles - Clean or change injection nozzles.
Incorrectly set low idle speed - Normalize low idle speed.
Excessive valve clearance - Adjust valve clearance.
Fuel injection pump is defective - Replace injection pump or repair it.
| Diesel engine loses power |
Defective injection nozzle - Test injection nozzles and change if necessary.
Fuel hoses or lines are dirty - Clean fuel system hoses and lines.
Plugged air cleaner - Clean or change.
Cylinder head gasket is defective - Replace cylinder head gasket.
Incorrect injection timing - Use correct injection timing adjustment.
Faulty fuel injection pump - Change or repair the pump.
One of moving engine components is worn - Change or repair damaged parts.
Defective radiator cap or clogged radiator fins - Clean radiator or install new cap.
Lack of engine coolant - Refill to the correct level and inspect system for leaks.
Loose or defective fan belt - Belt replacement is recommended.
Lack of engine oil - Fill up the engine oil.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Incorrect injection timing - Adjust according to specifications.
| Insufficient oil pressure |
Oil level is low - Fill crankcase to proper oil level.
Worn oil pump - Remove and inspect oil pump.
Oil filter element clogging - Clean or change engine oil filter.
Stuck or worn relief valve - Change or service relief valve.
Excessive oil clearance of crankshaft bearing - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Test and replace or repair worn components.
| Diesel engine using too much oil |
Oil leakage: Seals or gaskets are wearing excessively - Change worn parts according to specifications.
Oil viscosity is wrong - Fill up with the proper oil viscosity.
Damaged or seized piston rings - Piston rings replacement required.
Worn valve guides and valve stems - Valves need to be changed.
Pistons or cylinder liners are scuffed - Check pistons and liners, replace as required.
| Engine knocking sound or abnormal noise |
Engine is cold - Normalize the temperature by warming up the engine.
Insufficient engine oil - Fill up the engine oil.
Fuel injection pump timing is not adjusted - Adjust the pump as required.
Scored or worn pistons - Replace the pistons as required.
Connecting rod misalignment or failure - Replace or align connecting rod.
| Starter motor cranks slow |
Low battery voltage - Low battery charging, charge as required.
Battery drains quickly - Service battery or change it.
Disconnected battery cables or bad terminals - Connect wires properly or change terminals.
Battery is low or faulty - Replace or charge as required.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery capacity - Battery needs to be recharged.
Starter motor failure - Starter should be replaced.
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