Mitsubishi 6DS7 Troubleshooting
| Engine Model: Mitsubishi 6DS7 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 331.4 cu.in (5.43 L) |
| Rated Engine Power: 135-200 Hp (101-148 kW) at 2600 rpm |
| Fuel System Type: Indirect injection |
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| Diesel hard to start or doesn't start |
Dirty fuel filter - Clean the filter element.
Air in fuel system - Bleed fuel system.
Clogged or defective injection nozzles - Service or change injection nozzles.
Fuel injection pump is broken - Rebuild or change fuel pump.
Incorrect valve timing - Correct or change timing gear.
Fuel pipes are dirty - Clean or change fuel pipes.
Improper injection timing - Set up as recommended.
Piston rings and cylinder are worn - Replace faulty components.
| Engine starts and stalls suddenly |
Fuel filter element is clogged - Change filter element.
Defective fuel injection pump - Repair or install new pump.
Clogged air filter element - Service or replace the air filter.
Improper nozzle opening pressure - Adjust as required.
| Engine shuts off suddenly during operation |
Improper fuel injection timing - Adjust fuel injection pump as required.
Fuel filter plugging - Service or replace the filter.
Low coolant temperature - Warm up engine as required.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
Incorrect low idle setting - Normalize low idle speed.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump is broken - Change pump or rebuild it.
| Engine power is insufficient |
Clogged or defective injection nozzles - Check and replace nozzles if required.
Fuel hoses or lines are clogged - Clean fuel lines and hoses.
Clogged air cleaner - Change air filter element.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Set up as recommended.
Fuel injection pump is broken - Repair or change injection pump.
One of moving engine components has failed - Change or repair damaged parts.
Clogged radiator fins or leaking radiator cap - Replace cap or clean radiator.
Insufficient coolant fluid - Add coolant fluid and inspect the cooling system for leaks.
Damaged or worn fan belt - The fan belt needs to be replaced.
Low engine oil level - Fill the crankcase with engine oil.
Defective cylinder head gasket - Change cylinder head gasket.
Unadjusted injection timing - Adjust according to specifications.
Lack of oil - Add oil as required.
Defective oil pump - Remove and inspect oil pump.
Clogged oil filter - Service or replace engine oil filter.
Relief valve is stuck or worn - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
Oil leaking: Defective seals or gaskets - Replace to repair leaks.
Crankcase oil too light - Use correct viscosity oil.
Stuck or defective piston rings - Piston rings need to be replaced.
Valve guides and stems are worn - Replace defective valves.
Worn pistons or cylinder liners - Check liners and pistons, change as required.
Engine is not preheated - Normalize the temperature by warming up the engine.
Not enough engine oil - Fill up the oil to required level.
Fuel injection pump timing is not adjusted - Adjust the pump as required.
Pistons are scored or worn - Pistons need to be replaced.
Misaligned or faulty connecting rod - Need to align or replace the connecting rod.
Low battery voltage - Recharge the battery.
Battery drains quickly - Service battery or replace it.
Disconnected cables or faulty battery terminals - Connect wiring properly or install new terminals.
Battery is low or faulty - Charge or replace the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery power - Battery is drained, recharge it.
Defective starter motor - Starter needs to be replaced.
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