Mitsubishi S6R Troubleshooting
| Engine Model: Mitsubishi S6R |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 1,495 cu.in (24.5 L) |
| Rated Engine Power: 603-925 Hp (450-690 kW) at 1800 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or won't start |
Fuel filter plugging - Filter maintenance required.
Air trapped in fuel system - Bleed air.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Defective fuel injection pump - Rebuild or change fuel pump.
Wrong valve timing - Use correct valve timing adjustment.
Fuel pipes are clogged - Service or replace fuel pipes.
Injection timing is out of adjustment - Set the injection timing correctly.
Worn cylinder or piston rings - Change faulty components.
| Engine starts and stops suddenly |
Dirty fuel filter - Service the filter.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Plugged air filter - Change air filter element.
Nozzle opening pressure is incorrect - Set up as recommended.
| Engine stalls during operation |
Wrong setting of fuel injection pump timing - Set it up as required.
Fuel filter element clogging - Clean the filter or install new filter element.
Coolant temperature is low - Warm up engine as required.
Defective or stuck injection nozzles - Clean or change injection nozzles.
Low idle speed adjustment is incorrect - Adjust the low idle speed.
Valve clearance is wrong - Correct valve clearance needs to be set.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
| Diesel engine is losing power |
Damaged or dirty injection nozzles - Replace injection nozzles.
Clogged fuel lines or hoses - Clean fuel system lines and hoses.
Air filter plugged - Service air cleaner.
Blown cylinder head gasket - Install a new gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Fuel injection pump is broken - Repair or install a new fuel pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Dirty radiator core or faulty radiator cap - Install new cap or clean radiator.
Lack of coolant in cooling system - Add coolant fluid and inspect the cooling system for leaks.
Fan belt slipping or worn - Belt change is required.
Insufficient engine oil - Check oil level and add oil as required.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Injection timing is out of adjustment - Adjust injection timing as required.
Low oil level - Need to add oil.
Oil pump is worn or damaged - Replace as required.
Oil filter is clogged - Change or clean engine oil filter element.
Relief valve is stuck or broken - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
| Engine oil consumption is too high |
Oil leaking: Worn gaskets or seals - Worn parts need to be replaced.
Oil viscosity is incorrect - Use oil of proper viscosity.
Piston rings are stuck or worn - Have piston rings replaced.
Valve stems or guides are damaged - Change the valves.
Scuffed pistons or cylinder liners - Inspect liners and pistons, fit new parts as necessary.
Engine not warmed up - Warm up to required temperature.
Engine oil level is insufficient - Checking oil level and add if necessary.
Fuel injection pump timing is wrong - Adjust the pump as required.
Pistons are worn or scored - Pistons need to be replaced.
Connecting rod is not aligned or defective - Align or replace connecting rod.
Battery capacity is low - Charge the battery.
Battery will not hold charge - Service charging system or replace battery.
Disconnected cables or faulty battery terminals - Check cables and clean or change terminals.
| Starter motor is not working |
Battery is discharged or defective - Charge or change the battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Low battery power - Battery is drained, recharge it.
Starter motor is damaged - Starter needs to be changed.
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