Mitsubishi 6DR5 Troubleshooting
| Engine Model: Mitsubishi 6DR5 |
| Engine Type: 4-cycle inline 6-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 243.4 cu.in (3.98 L) |
| Rated Engine Power: 105 Hp (78 kW) at 3700 rpm |
| Fuel System Type: Indirect injection |
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| Engine difficult to start or won't start |
Clogged fuel filter - Change the filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are dirty or defective - Install a new kit of correctly balanced nozzles.
Fuel injection pump damage - Rebuild or replace pump.
Valve timing is improper - Set the valve timing correctly.
Fuel pipes are dirty - Clean or change fuel pipes.
Incorrect injection timing - Set the injection timing correctly.
Cylinder or piston rings are worn - Replace faulty parts.
| Engine starts but stalls suddenly |
Fuel filter element clogging - Clean or change the filter.
Fuel injection pump is not working correctly - Replace or repair injection pump.
Clogged air filter - Clean or replace element.
Nozzle opening pressure is improper - Set up as recommended.
| Engine stops running suddenly |
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Clogged fuel filter - Clean the filter or install new filter element.
Engine is not preheated - Warm up engine as required.
Defective or stuck injection nozzles - Clean or change injection nozzles.
| Engine stalls while idling |
Improperly adjusted low idle speed - Correct the settings.
Incorrect valve clearance - Adjust to proper valve clearance.
Fuel injection pump is faulty - Replace injection pump or repair it.
Damaged or dirty injection nozzles - Inspect nozzles and replace if necessary.
Dirt in the fuel lines or hoses - Service fuel hoses and lines.
Dirty air filter element - Air filter maintenance required.
Cylinder head gasket is worn - Install a new gasket.
Injection timing is wrong - Adjust as recommended.
Faulty fuel injection pump - Repair or change injection pump.
One of moving engine components is worn - Repair or replace defective components.
Clogged radiator core or leaking radiator cap - Replace cap or clean radiator.
Lack of coolant in cooling system - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is worn or faulty - Replace the fan belt.
Engine oil level low - Checking oil level and add if necessary.
Cylinder-head gasket is broken - Install a new gasket.
Wrong injection timing - Adjust as recommended.
Oil level is insufficient - Check oil level and add oil as required.
Defective oil pump - Repair or replace.
Dirty oil filter - Replace or service engine oil filter.
Relief valve is stuck or broken - Change or service relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Inspect and change or repair worn components.
| Diesel engine using too much oil |
Oil leaking: Damaged seals or gaskets - Defective components must be replaced.
Improper oil viscosity - Use oil of proper viscosity.
Piston rings are stuck or broken - Change the piston rings as required.
Valve guides or stems are damaged - Valves must be replaced.
Scuffed pistons or cylinder liners - Check pistons and liners, replace as required.
Engine is not preheated - Warm up engine as required.
Engine oil level is insufficient - Checking oil level and add if necessary.
Improper fuel injection timing - Adjust the pump as required.
Worn or broken pistons - Install new pistons.
Connecting rod is defective or not aligned - Align or change connecting rod.
Battery voltage is low - Charge the battery.
Battery won’t hold charge - Service or change the battery.
Bad battery terminals or disconnected wiring - Check cables and clean or change terminals.
| Starter motor is not working |
Battery is low or faulty - Battery needs to be recharged or replaced.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery power is low - Battery is drained, recharge it.
Defective starter motor - Starter should be replaced.
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