Mitsubishi 8DC11 Troubleshooting
| Engine Model: Mitsubishi 8DC11 |
| Engine Type: 4-cycle 8-cylinder V-block naturally aspirated liquid-cooled diesel |
| Total Displacement: 1082 cu.in (17.73 L) |
| Rated Engine Power: 380 Hp (280 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or doesn't start |
Fuel filter element clogging - Clean the filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles fault - Service or change injection nozzles.
Damaged fuel injection pump - Replace injection pump or repair it.
Incorrect valve timing - Correct or change timing gear.
Fuel pipes are dirty - Clean fuel pipes.
Injection timing is incorrect - Adjust according to specifications.
Worn piston rings and cylinder - Change defective components.
| Engine starts but stalls immediately |
Fuel filter element clogging - Service the filter.
Fuel injection pump damage - Rebuild or replace pump.
Intake air restriction - Clean or replace the element.
Improper nozzle opening pressure - Adjust as recommended.
| Engine stalls during operation |
Fuel injection timing is wrong - Adjust as recommended.
Fuel filter element is clogged - Clean or change the filter.
Engine is not warmed up to the required temperature - Normalize the temperature by warming up the engine.
Stuck or burnt injection nozzle - Repair or replace injection nozzles.
Low idle speed adjustment is incorrect - Correct the settings.
The valve clearance is not adjusted - Adjust valve clearance.
Fuel injection pump malfunctioning - Change pump or rebuild it.
Fuel injection nozzles are faulty or clogged - Check injection nozzles and replace if required.
Dirty fuel lines or hoses - Clean fuel system hoses and lines.
Clogged air filter - Air filter maintenance required.
Blown cylinder head gasket - Change cylinder head gasket.
Improper injection timing - Use correct injection timing adjustment.
Faulty fuel injection pump - Rebuild or replace pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Radiator core is dirty or radiator cap is damaged - Clean radiator or change cap.
Engine coolant is insufficient - Add coolant and check the components of cooling system.
Loose or damaged fan belt - Change as required.
Engine oil level low - Check and refill engine oil.
Cylinder head gasket is blown - Change cylinder head gasket.
Injection timing is wrong - Set up as recommended.
Not enough oil in the engine - Need to add oil.
Oil pump is worn or damaged - Repair or replace.
Oil filter is clogged - Service or change engine oil filter element.
Relief valve is stuck or worn - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Inspect and change or repair worn components.
| High engine oil consumption |
External oil leaks: Seals or gaskets are wearing excessively - To repair leaks, replace worn parts.
Wrong oil viscosity - Fill up with the correct oil viscosity.
Worn or broken piston rings - Piston rings need to be replaced.
Damaged valve stems or valve guides - Replace the valves.
Worn pistons or cylinder liners - Check liners and pistons, change as required.
Engine is not fully warmed up - Warm up the engine.
Low engine oil level - Check and refill engine oil.
Improper setting of fuel injection pump timing - Set it up as required.
Piston wear or scoring - Replace the pistons.
Connecting rod failure or misalignment - Need to change or align the connecting rod.
Low battery output voltage - Battery needs to be recharged.
Battery discharges quickly - Battery needs service or replacement.
Disconnected wires or corroded battery terminals - Check cable connections and change or clean terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery power - Battery needs to be recharged.
Starter motor failure - Change or repair starter.
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