Mitsubishi 6DB1 Troubleshooting
| Engine Model: Mitsubishi 6DB1 |
| Engine Type: 4-cycle inline 6-cylinder liquid-cooled diesel |
| Total Displacement: 522 cu.in (8.55 L) |
| Rated Engine Power: 163-217 Hp (121-162 kW) at 2300 rpm |
| Fuel System Type: Direct injection |
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| Engine hard to start or will not start |
Fuel filter plugged - Service or replace the filter.
Air in fuel tank - Bleed fuel tank.
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Defective fuel injection pump - Repair or install new pump.
Unadjusted valve timing - Set the valve timing correctly.
Fuel pipes are clogged - Service fuel pipes.
Improper injection timing - Set the injection timing correctly.
Cylinder or piston rings are worn - Replace defective components.
| Engine stalls after starting |
Fuel filter plugging - Service the filter.
Defective fuel injection pump - Repair or install a new fuel pump.
Dirty air filter - Clean or change the filter.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine stops running suddenly |
Fuel injection timing is wrong - Set up as recommended.
Fuel filter plugging - Install new filter element.
Engine is not preheated - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Service or change injection nozzles.
| Engine stalls while idling |
Low idle speed setting is incorrect - Correct the settings.
The valve clearance is incorrect - Adjust to proper valve clearance.
Defective fuel injection pump - Change or repair the pump.
Clogged injection nozzle - If necessary, replace with a new nozzle.
Fuel hoses or lines are dirty - Service fuel lines and hoses.
Plugged air filter - Clean or replace the element.
Defective cylinder head gasket - Gasket should be replaced.
Injection timing is out of adjustment - Adjust according to specifications.
Fuel injection pump is faulty - Change pump or rebuild it.
One of moving engine parts has broken - Repair or replace defective parts.
Defective radiator cap or clogged radiator fins - Install new cap or clean radiator.
Engine coolant is insufficient - The cooling system needs to be refilled and checked for faults.
Fan belt is broken or worn - The fan belt needs to be replaced.
Engine oil level is low - Checking oil level and add if necessary.
Cylinder head gasket defective - Gasket should be replaced.
Injection timing is improper - Adjust injection timing as required.
| Insufficient oil pressure |
Engine oil insufficient - Checking oil level and add if necessary.
Worn oil pump - Inspect and change as required.
Oil filter clogged - Replace or service engine oil filter.
Relief valve is stuck or broken - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| Engine consuming too much oil |
Oil leaks: Gaskets or seals can be faulty - Defective components must be replaced.
Oil viscosity is incorrect - Use oil of proper viscosity.
Piston rings are defective or worn - Replace piston rings.
Valve stems or guides are damaged - Need to replace the valves.
Pistons or cylinder liners are damaged - Inspect liners and pistons, fit new parts as necessary.
| Abnormal engine knocking or noise |
Low coolant temperature - Warm up the engine.
Engine oil level is low - Check and refill engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.
Pistons are broken or worn - Install new pistons.
Connecting rod is not aligned or defective - Connecting rod must be aligned or replaced.
Low battery power - Battery is drained, recharge it.
Battery discharges quickly - Battery needs to be serviced or replaced.
Disconnected battery cables or bad terminals - Check wiring and clean or replace terminals.
Battery is drained or worn - Change or recharge battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery power - Battery is drained, charge it.
Starter motor is damaged - Repair or replace starter.
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