Cummins L9-350 Troubleshooting
| Engine Model: Cummins L9-350 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 543 cu.in (8.9 L) |
| Rated Engine Power: 350 Hp (261 kW) at 2200 rpm |
| Fuel System Type: Xtra-High Pressure Injection |
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| Diesel hard to start or doesn't start |
Fuel filter element is dirty - Clean or change the filter.
Air in fuel system - Bleed fuel system.
Dirty or damaged injection nozzles - Test injection nozzles and change if necessary.
Damaged fuel injection pump - Replace injection pump or repair it.
Valve timing is out of adjustment - Correct or change timing gear.
Dirty fuel pipes - Service fuel pipes.
Injection timing is incorrect - Adjust as recommended.
Piston rings and cylinder are worn - Replace faulty parts.
| Diesel starts but immediately shuts off |
Fuel filter plugged - Change filter element.
Fuel injection pump is defective - Repair or change injection pump.
Dirty air filter element - Change air filter element.
Improper nozzle opening pressure - Set it correctly.
| Engine stalls while running |
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
Fuel filter plugged - Filter maintenance required.
Engine has not warmed up to the recommended temperature - Warm up to required temperature.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Excessive valve clearance - Check and adjust.
Fuel injection pump damage - Repair or install new pump.
Clogged or defective injection nozzles - Replace injection nozzles.
Dirty fuel hoses or lines - Clean fuel lines and hoses.
Air filter clogged - Carry out maintenance on air filter.
Cylinder-head gasket is leaking - Replace cylinder head gasket.
Injection timing is incorrect - Use correct injection timing adjustment.
Fuel injection pump failure - Replacement or repair required.
One of moving engine components has failed - Repair or replace defective components.
Radiator fins are dirty or radiator cap is defective - Replace cap or clean radiator.
Engine has a lack of coolant - Fill radiator to proper level and check components for faults.
Loose or defective fan belt - If necessary, replace the belt.
Engine oil level is low - Check oil level and add oil as required.
Cylinder head gasket is worn - Install new cylinder head gasket.
Unadjusted injection timing - Set the injection timing correctly.
Engine oil level low - Check oil level and add oil as required.
Oil pump is damaged - Repair or replace.
Oil filter element clogging - Replace or service engine oil filter.
Relief valve is defective or dirty - Change or service relief valve.
Crankshaft bearing clearance is excessive - Test and replace or repair worn components.
Crankpin bearing clearance is excessive - Inspect and change or repair worn components.
| Excessive engine oil consumption |
Oil leaks: Seals or gaskets are defective - Replace worn parts to avoid leaks.
Improper oil viscosity - Fill up with the proper oil viscosity.
Worn or stuck piston rings - Have piston rings replaced.
Damaged valve stems or valve guides - Need to replace the valves.
Cylinder liners or pistons are damaged - Check liners and pistons, replace as required.
Engine is cold - Engine is not warmed up to the required temperature.
Low engine oil level - Fill up the oil to required level.
Fuel injection pump timing is wrong - Set the fuel pump timing correctly.
Pistons are broken or worn - Replace the pistons as required.
Connecting rod is worn or not aligned - Align or replace connecting rod.
Low battery output - Low battery charging, charge as required.
Battery drains quickly - Battery needs service or replacement.
Battery cables are disconnected or terminals are faulty - Connect cables properly or replace terminals.
| Starter motor is not working |
Battery is discharged or defective - Replace or charge as required.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery voltage is low - Battery is drained, recharge it.
Starter motor is defective - Change or repair starter.
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