Cummins ISX-550 Troubleshooting
| Engine Model: Cummins ISX-550 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 912 cu.in (14.9 L) |
| Rated Engine Power: 550 Hp (410 kW) at 2100 rpm |
| Fuel System Type: High-Pressure Injection |
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| Diesel hard to start or doesn't start |
Fuel filter plugged - Install new filter element.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles fault - Replace injection nozzles.
Fuel injection pump malfunctioning - Replace or rebuild injection pump.
Unadjusted valve timing - Use correct valve timing adjustment.
Restricted fuel pipes - Service or replace fuel pipes.
Injection timing is improper - Adjust as recommended.
Damaged piston rings and cylinder - Replace defective parts.
Dirty fuel filter - Install new filter element.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Air filter element clogged - Service or replace the air filter.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly during operation |
Improper fuel injection timing - Set it up as required.
Clogged fuel filter - Service or replace the filter.
Low coolant temperature - Engine is not warmed up to the required temperature.
Stuck or clogged injection nozzle - Service or change injection nozzles.
| Engine stalls at low idle speed |
Wrong adjustment of low idle speed - Correct the settings.
The valve clearance is incorrect - Correct valve clearance.
Fuel injection pump is damaged - Repair or install new pump.
Faulty or dirty injection nozzles - Replace injection nozzles.
Restricted fuel lines or hoses - Clean fuel hoses and lines.
Air cleaner is dirty - Service or replace the air filter.
Cylinder head gasket defective - Install a new gasket.
Unadjusted injection timing - Set the injection timing correctly.
Faulty fuel injection pump - Install a new fuel pump or repair.
Any of moving engine components is faulty - Repair or replace defective components.
Clogged radiator core or damaged radiator cap - Replace cap or clean radiator.
Insufficient coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt slipping or worn - The fan belt needs to be replaced.
Not enough engine oil - Fill up the oil to required level.
Cylinder head gasket defective - Cylinder-head gasket replacement required.
Wrong injection timing - Set up as recommended.
| Insufficient oil pressure |
Not enough oil in the engine - Fill crankcase to proper oil level.
Defective oil pump - Remove and inspect oil pump.
Oil filter is dirty - Clean or change engine oil filter.
Stuck or worn relief valve - Change or service relief valve.
Crankshaft bearing clearance is excessive - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Diesel engine consuming too much oil |
Oil leaking: Gaskets or seals may be damaged - Defective components must be replaced.
Improper oil viscosity - Use proper viscosity oil.
Worn or stuck piston rings - Replace piston rings.
Valve stems or guides are damaged - Replace the valves.
Cylinder liners or pistons are scuffed - Inspect pistons and liners, replace as required.
| Abnormal engine knocking or noise |
Low coolant temperature - 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 it up as required.
Piston wear or scoring - Pistons replacement required.
Connecting rod is defective or not aligned - Need to align or replace the connecting rod.
Battery voltage is low - Low battery charging, charge as required.
Battery does not hold charge - Battery needs to be serviced or replaced.
Disconnected wiring or bad battery terminals - Check wire connections and change or service terminals.
Battery is drained or worn - Recharge or change battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery output voltage - Battery is drained, recharge it.
Faulty starter motor - Repair or install a new starter.
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