Cummins 6T-590 Troubleshooting
| Engine Model: Cummins 6T-590 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 359 cu.in (5.9 L) |
| Rated Engine Power: 115-160 Hp (85-118 kW) at 2000 rpm |
| Fuel System Type: Direct injection |
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| Engine starts up hard or will not start |
Dirty fuel filter - Replace filter element.
Air in fuel tank - Bleed fuel tank.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Fuel injection pump damage - Change or repair the pump.
Wrong valve timing - Use correct valve timing adjustment.
Dirty fuel pipes - Service fuel pipes.
Improper injection timing - Set up as recommended.
Cylinder or piston rings are worn - Replace faulty components.
Fuel filter element clogging - Replace filter element.
Faulty fuel injection pump - Replace or rebuild injection pump.
Clogged air cleaner - Change air filter element.
Unadjusted nozzle opening pressure - Adjust according to specifications.
| Diesel shuts off while driving |
Improper fuel injection timing - Use the correct fuel injection pump timing adjustment.
Dirty fuel filter - Clean the filter element.
Coolant temperature is low - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Change or repair injection nozzles.
| Engine stalls at low idle speed |
Low idle speed setting is incorrect - Test and adjust.
Excessive valve clearance - Correct valve clearance.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
Dirty or faulty injection nozzles - Inspect nozzles and replace if necessary.
Dirt in the fuel hoses or lines - Clean fuel hoses and lines.
Intake air restriction - Clean air cleaner element.
Cylinder head gasket is damaged - Replace the gasket as required.
Wrong injection timing - Adjust as recommended.
Fuel injection pump malfunctioning - Change or repair the pump.
One of moving engine components is worn - Change or repair damaged parts.
Defective radiator cap or clogged radiator core - Install new cap or clean radiator.
Low coolant level - Fill radiator to proper level and check components for faults.
Fan belt slipping or worn - The fan belt needs to be replaced.
Not enough engine oil - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Replace the gasket as required.
Injection timing is improper - Adjust according to specifications.
Low oil level - Check oil level and add oil as required.
Worn oil pump - Check and replace if necessary.
Oil filter clogged - Service or change engine oil filter element.
Relief valve is stuck or worn - Change or service relief valve.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Excessive oil clearance of crankpin bearing - Inspect and replace or repair faulty components.
| Diesel engine using too much oil |
Oil leakage: Worn gaskets or seals - Change worn parts according to specifications.
Oil viscosity is incorrect - Use correct viscosity oil.
Piston rings are defective or worn - Piston rings replacement required.
Worn valve stems and valve guides - Install new valves.
Cylinder liners or pistons are damaged - Check liners and pistons, change as required.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Engine oil insufficient - Fill up the oil to required level.
Fuel injection pump timing is not adjusted - Use the correct fuel injection pump timing adjustment.
Piston wear or scoring - Pistons need to be replaced.
Connecting rod is not aligned or defective - Need to replace or align the connecting rod.
Battery capacity is low - Recharge the battery.
Battery runs out quickly - Service or replace the battery.
Disconnected cables or faulty battery terminals - Connect cables correctly or replace terminals.
Battery is low or faulty - Change or recharge battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery output voltage - Low battery charging, charge as required.
Starter motor is damaged - Repair or change starter.
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