Mitsubishi S6K Troubleshooting
| Engine Model: Mitsubishi S6K |
| Engine Type: 4-cycle 6-cylinder SOHC forced-feed lubrication liquid-cooled diesel |
| Total Displacement: 388.9 cu.in (6.37 L) |
| Rated Engine Power: 109-161 Hp (81-120 kW) at 2000 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine starts up hard or won't start |
Dirty fuel filter - Change filter element.
Air in the fuel system - Air bleeding.
Defective injection nozzle - Clean or replace injection nozzles.
Fuel injection pump malfunction - Change pump or rebuild it.
Valve timing is improper - Correct or replace timing gear.
Restricted fuel pipes - Clean or replace fuel pipes.
Injection timing is improper - Set up as recommended.
Excessive wear of piston rings and cylinder - Replace faulty parts.
| Diesel starts and stalls immediately |
Fuel filter plugging - Install new filter element.
Faulty fuel injection pump - Change pump or rebuild it.
Plugged air filter - Clean or change.
Incorrect nozzle opening pressure - Adjust according to specifications.
| Engine stops unexpectedly during operation |
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Fuel filter plugging - Service or replace the filter.
Engine not warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are jammed or clogged - Clean or replace injection nozzles.
Wrong adjustment of low idle speed - Adjust low idling as recommended.
The valve clearance is incorrect - Have it adjusted.
Fuel injection pump is not operating properly - Change or repair the pump.
| Engine is not running at maximum power |
Damaged or dirty injection nozzles - Clean or replace injection nozzles.
Fuel hoses or lines are dirty - Clean fuel system lines and hoses.
Air filter clogged - Replace air filter element.
Damaged cylinder-head gasket - Replace cylinder head gasket.
Injection timing is improper - Adjust as recommended.
Fuel injection pump is damaged - Replace injection pump or repair it.
One of moving engine parts is faulty - Repair or replace defective components.
Dirty radiator core or defective radiator cap - Clean radiator or replace cap.
Coolant level is low - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is loose or defective - Replace as required.
Low engine oil level - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Gasket should be replaced.
Incorrect injection timing - Check injection timing adjustment.
| Oil pressure is insufficient |
Low crankcase oil level - Add oil as required.
Worn oil pump - Replace as required.
Oil filter is dirty - Change or service engine oil filter.
Stuck or worn relief valve - Replace or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and change or repair worn components.
Excessive oil clearance of crankpin bearing - Check and replace or repair defective parts.
| Engine oil consumption is too high |
Oil leaking: Gaskets or seals may be damaged - Change to repair leaks.
Oil viscosity is incorrect - Fill up with the proper oil viscosity.
Piston rings are stuck or broken - Change piston rings.
Valve stems and guides are worn - Change the valves.
Damaged pistons or cylinder liners - Check liners and pistons, replace as required.
Coolant temperature is low - Warm up engine as required.
Engine oil level is low - Checking oil level and add if necessary.
Incorrect adjustment of fuel injection pump timing - Adjust according to specifications.
Pistons are broken or worn - Pistons need to be replaced.
Faulty or misaligned connecting rod - Align or replace connecting rod.
Low battery capacity - Recharge the battery.
Battery runs out quickly - Service charging system or install new battery.
Bad battery terminals or disconnected wiring - Check battery wires and service or replace terminals.
Battery is low or faulty - Change or recharge battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery capacity - Recharge the battery.
Damaged starter motor - Starter needs to be replaced.
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