Mitsubishi 6D15 Troubleshooting
| Engine Model: Mitsubishi 6D15 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 422 cu.in (6.92 L) |
| Rated Engine Power: 155-160 Hp (115-119 kW) at 2800 rpm |
| Fuel System Type: Direct injection |
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| Engine hard to start or won't start |
Fuel filter plugging - Filter maintenance required.
There is air in the fuel system - Bleed the system.
Dirty or faulty injection nozzles - Service or change injection nozzles.
Fuel injection pump malfunctioning - Change pump or rebuild it.
Unadjusted valve timing - Set the valve timing correctly.
Restricted fuel pipes - Clean or change fuel pipes.
Unadjusted injection timing - Adjust injection timing as required.
Worn cylinder or piston rings - Replace defective parts.
Clogged fuel filter - Clean the filter or install new filter element.
Damaged fuel injection pump - Replace or rebuild injection pump.
Dirty air filter - Air filter maintenance required.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stalls during operation |
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Fuel filter element is clogged - Change filter element.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Injection nozzles sticking or clogged - Clean or change injection nozzles.
Incorrect low idle setting - Adjust low idle speed.
Valve clearance is not correct - Adjustment procedure required.
Fuel injection pump is faulty - Replace or rebuild injection pump.
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Dirt in the fuel hoses or lines - Clean fuel lines and hoses.
Restricted intake air - Clean or change.
Cylinder head gasket is blown - Install new cylinder head gasket.
Injection timing is incorrect - Set the injection timing correctly.
Fuel injection pump failure - Replacement or repair required.
One of moving engine components is worn - Change or repair damaged parts.
Clogged radiator core or leaking radiator cap - Clean radiator or change cap.
Lack of coolant in cooling system - Add coolant fluid and inspect the cooling system for leaks.
Fan belt is worn or faulty - Change as required.
Engine oil insufficient - Fill the crankcase with engine oil.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Injection timing is improper - Set up as recommended.
| Oil pressure is insufficient |
Engine oil level low - Fill crankcase to proper oil level.
Worn oil pump - Remove and inspect oil pump.
Clogged oil filter element - Change or service engine oil filter.
Relief valve is stuck or worn - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty parts.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty components.
| Engine using too much oil |
Oil leaks: Worn seals or gaskets - New components need to be installed.
Crankcase oil too light - Use correct viscosity oil.
Piston rings are stuck or worn - Piston rings need to be replaced.
Valve stems and guides are worn - Change the valves.
Damaged pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
Engine is not preheated - Warm up to required temperature.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Improper setting of fuel injection pump timing - Adjust according to specifications.
Worn or broken pistons - Install new pistons.
Connecting rod is not aligned or worn - Need to change or align the connecting rod.
Battery power is low - Battery needs to be recharged.
Battery won’t hold charge - Battery needs service or replacement.
Disconnected battery cables or bad terminals - Connect wires correctly or change terminals.
Battery is low or faulty - Charge or change the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery capacity is low - Battery is drained, charge it.
Starter motor is faulty - Repair or replace starter.
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