Cummins ISX-435 Troubleshooting
| Engine Model: Cummins ISX-435 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 912 cu.in (14.9 L) |
| Rated Engine Power: 435 Hp (325 kW) at 2000 rpm |
| Fuel System Type: High-Pressure Injection |
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| Engine difficult to start or will not start |
Clogged fuel filter - Service or replace the filter.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are damaged - Replace injection nozzles.
Fuel injection pump is defective - Replace or repair injection pump.
Improper valve timing - Adjust or replace timing gear.
Fuel pipes are plugged - Service or change fuel pipes.
Incorrect injection timing - Adjust as recommended.
Worn cylinder or piston rings - Replace defective parts.
| Diesel starts but stalls suddenly |
Fuel filter element clogging - Clean or change the filter.
Fuel injection pump is defective - Replace injection pump or repair it.
Air cleaner is dirty - Service air cleaner.
Incorrect nozzle opening pressure - Set up as recommended.
| Diesel shuts off while driving |
Timing of fuel injection pump is incorrect - Set up as recommended.
Fuel filter element is dirty - Change the filter element.
Engine is not fully warmed up - Warm up to required temperature.
Defective or stuck injection nozzles - Repair or replace injection nozzles.
| Engine shuts off while idling |
Too low idle RPM - Correct low idle settings.
The valve clearance is incorrect - Adjustment procedure required.
Fuel injection pump is damaged - Rebuild or replace pump.
| Engine power is insufficient |
Defective or clogged injection nozzle - Inspect nozzles and replace if necessary.
Fuel hoses or lines are clogged - Fuel hoses and lines must be clean.
Dirty air filter element - Clean or change the filter.
Cylinder head gasket is damaged - Replace the gasket as required.
Injection timing is improper - Use correct injection timing adjustment.
Fuel injection pump is faulty - Repair or change injection pump.
One of moving engine parts is faulty - Change or repair damaged parts.
Defective radiator cap or clogged radiator fins - Change cap or clean radiator.
Low coolant level - Refill to the correct level and inspect system for leaks.
Broken or loose fan belt - Replace as required.
Engine oil level is insufficient - Check and refill engine oil.
Blown cylinder head gasket - Replace cylinder head gasket.
Wrong injection timing - Adjust injection timing as required.
| Oil pressure is insufficient |
Engine oil insufficient - Fill up the engine oil.
Oil pump malfunction - Replace as required.
Clogged oil filter element - Replace or service engine oil filter.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Crankshaft bearing clearance is excessive - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty components.
| High engine oil consumption |
Oil leaking: Worn seals or gaskets - Replace to repair leaks.
Oil viscosity is incorrect - Fill up with the correct oil viscosity.
Stuck or defective piston rings - Install new piston rings.
Valve stems or guides are damaged - Replace the valves.
Worn pistons or cylinder liners - Check liners and pistons, install new components as required.
| Abnormal engine knocking or noise |
Coolant temperature is low - Normalize the temperature by warming up the engine.
Engine oil level is low - Fill up the engine oil.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Pistons are worn or broken - Install new pistons.
Connecting rod is not aligned or defective - Alignment procedure or replacement is required.
Battery voltage is low - Battery needs to be recharged.
Battery won’t hold charge - Service charging system or replace battery.
Disconnected wires or corroded battery terminals - Check battery wires and service or replace terminals.
Battery is drained or defective - Charge or replace the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery power is low - Battery needs to be recharged.
Starter motor failing - Starter needs to be changed.
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