Cummins ISX-450ST Troubleshooting
| Engine Model: Cummins ISX-450ST |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 912 cu.in (15 L) |
| Rated Engine Power: 450 Hp (336 kW) at 1800 rpm |
| Fuel System Type: High-Pressure Injection |
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| Engine hard to start or will not start |
Dirty fuel filter - Service or replace the filter.
There is air in the fuel system - Bleed the system.
Faulty or dirty injection nozzles - Change fuel injection nozzles.
Faulty fuel injection pump - Repair or install a new fuel pump.
Improper valve timing - Set the valve timing correctly.
Clogged fuel pipes - Clean or change fuel pipes.
Injection timing is wrong - Check injection timing adjustment.
Worn cylinder or piston rings - Replace defective parts.
| Diesel starts but immediately shuts off |
Fuel filter element is clogged - Change the filter element.
Damaged fuel injection pump - Replacement or repair required.
Clogged air filter - Clean or replace element.
Nozzle opening pressure is incorrect - Set it correctly.
| Diesel shuts off while driving |
Timing of fuel injection pump is incorrect - Adjust the pump as required.
Fuel filter plugged - Change filter element.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Stuck or clogged injection nozzle - Clean or change injection nozzles.
| Engine stalls when idling |
Incorrect low idle speed adjustment - Correct the settings.
Valve clearance is not correct - Correct valve clearance.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.
Defective or clogged injection nozzle - If necessary, replace with a new nozzle.
Fuel lines or hoses clogging - Clean fuel hoses and lines.
Intake air restriction - Replace air filter element.
Leaking cylinder head gasket - Install a new gasket.
Improper injection timing - Check injection timing adjustment.
Fuel injection pump failure - Rebuild or install a new injection pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Dirty radiator fins or defective radiator cap - Install new cap or clean radiator.
Lack of engine coolant - Add coolant and check the components of cooling system.
Fan belt is loose or defective - Replace the fan belt.
Insufficient engine oil - Check oil level and add oil as required.
Leaking cylinder head gasket - Install new cylinder head gasket.
Improper injection timing - Use correct injection timing adjustment.
Low crankcase oil level - Add oil as required.
Oil pump is worn or damaged - Replace as required.
Oil filter element clogging - Replace or clean engine oil filter element.
Stuck or defective relief valve - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Test and replace or repair worn components.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
| High engine oil consumption |
External oil leaks: Defective seals or gaskets - Replace defective parts.
Oil viscosity is wrong - Use oil of correct viscosity.
Worn or stuck piston rings - Replace piston rings.
Valve guides or stems are damaged - Change the valves.
Pistons or cylinder liners are scored - Inspect liners and pistons, change as necessary.
| Abnormal engine noise or knocking |
Low coolant temperature - Warm up the engine.
Engine oil level low - Fill the crankcase with engine oil.
Improper fuel injection timing - Set the fuel pump timing correctly.
Broken or worn pistons - Have pistons replaced.
Misaligned or defective connecting rod - Replace or align connecting rod.
Low battery output voltage - Battery needs to be recharged.
Battery is draining quickly - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Check cables and service or change terminals.
Battery is discharged or worn - Charge or change the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery power - Battery is drained, charge it.
Defective starter motor - Change or repair starter.
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