Cummins ISX-400ST Troubleshooting
| Engine Model: Cummins ISX-400ST |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 912 cu.in (15 L) |
| Rated Engine Power: 400 Hp (298 kW) at 2000 rpm |
| Fuel System Type: High-Pressure Injection |
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| Engine starts hard or will not start |
Fuel filter element is dirty - Replace filter element.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are faulty or clogged - Check and replace nozzles if required.
Faulty fuel injection pump - Replace injection pump or repair it.
Improper valve timing - Use correct valve timing adjustment.
Plugged fuel pipes - Clean or change fuel pipes.
Injection timing is wrong - Set the injection timing correctly.
Worn cylinder or piston rings - Replace defective parts.
| Diesel starts and suddenly stops |
Fuel filter element clogging - Install new filter element.
Faulty fuel injection pump - Replacement or repair required.
Air filter is dirty - Change air filter element.
Incorrect nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly during operation |
Fuel injection timing is wrong - Adjust according to specifications.
Fuel filter element is dirty - Change the filter element.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Injection nozzles are burnt or jammed - Check injection nozzles and replace if required.
| Engine shuts off while idling |
Low idle speed set incorrectly - Normalize low idle speed.
Valve out of adjustment - Adjustment procedure required.
Fuel injection pump is faulty - Replace or rebuild injection pump.
Faulty fuel injection nozzles - Service or change injection nozzles.
Dirt in the fuel lines or hoses - Clean fuel system hoses and lines.
Air filter clogged - Install new air filter element.
Cylinder-head gasket is broken - Cylinder-head gasket replacement required.
Incorrect injection timing - Adjust injection timing as required.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
Any of moving engine parts is worn - Replace or repair damaged components.
Clogged radiator fins or damaged radiator cap - Clean radiator or change cap.
Engine has a lack of coolant - Add coolant and check the components of cooling system.
Damaged or worn fan belt - Belt replacement is recommended.
Engine oil level is insufficient - Need to add engine oil.
Cylinder-head gasket is leaking - Install new cylinder head gasket.
Injection timing is incorrect - Check injection timing adjustment.
Low oil level - Need to add oil.
Oil pump malfunction - Inspect and change as required.
Oil filter is clogged - Clean or change engine oil filter.
Relief valve is seized or worn - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
| Engine consuming too much oil |
Oil leakage: Seals or gaskets are wearing excessively - Change worn parts according to specifications.
Crankcase oil too light - Fill up with the proper oil viscosity.
Piston rings are stuck or worn - Install new piston rings.
Worn valve stems and valve guides - Valves replacement required.
Cylinder liners or pistons are damaged - Inspect liners and pistons, replace as necessary.
Coolant temperature is low - Warm up to 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.
Worn or scored pistons - Install new pistons.
Connecting rod is defective or misaligned - Connecting rod must be aligned or replaced.
Battery capacity is low - Battery needs to be recharged.
Battery runs out quickly - Service charging system or replace battery.
Disconnected wires or corroded battery terminals - Check cables and clean or change terminals.
Battery is discharged or worn - Charge or replace the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery output - Low battery charging, charge as required.
Faulty starter motor - Starter should be changed.
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