Cummins ISX15 Troubleshooting
| Engine Model: Cummins ISX15 |
| Engine Type: 4-cycle inline 6-cylinder Extreme Pressure Injection liquid-cooled diesel |
| Total Displacement: 912 cu.in (15 L) |
| Rated Engine Power: 400-600 Hp (298-447 kW) at 2100 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine difficult to start or will not start |
Fuel filter element clogging - Clean or change the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Dirty or damaged injection nozzles - Change fuel injection nozzles.
Defective fuel injection pump - Repair or replace injection pump.
Wrong valve timing - Use correct valve timing adjustment.
Dirt in the fuel lines or hoses - Clean or change fuel pipes.
Injection timing is incorrect - Adjust injection timing as required.
Worn piston rings and cylinder - Replace defective parts.
| Diesel starts but then stops |
Fuel filter plugging - Replace the filter element.
Fuel injection pump is damaged - Repair or install a new fuel pump.
Plugged air cleaner - Clean or change the filter.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine stalls after running |
Fuel injection timing is wrong - Check the fuel injection pump timing adjustment.
Dirty fuel filter - Service or replace the filter.
Coolant temperature is low - Normalize the temperature by warming up the engine.
Stuck or burnt injection nozzle - Change or repair injection nozzles.
| Engine stalls at low idle speed |
Wrong adjustment of low idle speed - Correct low idle adjustment.
Valve clearance is out of adjustment - Adjust valve clearance.
Fuel injection pump is damaged - Rebuild or change fuel pump.
Faulty fuel injection nozzles - Check and replace nozzles if required.
Dirty fuel lines or hoses - Service fuel lines and hoses.
Air filter is dirty - Replace air filter element.
Damaged cylinder-head gasket - Install a new gasket.
Injection timing is out of adjustment - Adjust according to specifications.
Fuel injection pump is faulty - Replacement or repair required.
One of moving engine components is worn - Replace or repair damaged components.
Clogged radiator core or damaged radiator cap - Replace cap or clean radiator.
Lack of engine coolant - Top up coolant fluid and check system for leaks.
Loose or defective fan belt - Install new fan belt.
Low engine oil level - Fill the crankcase with engine oil.
Damaged cylinder-head gasket - Replace the gasket as required.
Improper injection timing - Adjust according to specifications.
| Insufficient oil pressure |
Lack of oil - Need to add oil.
Oil pump failure - Replace as required.
Oil filter is clogged - Clean or change engine oil filter.
Relief valve is seized or worn - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Test and replace or repair worn components.
| Excessive oil consumption |
External oil leaks: Seals or gaskets are defective - Defective components must be replaced.
Incorrect oil viscosity - Use oil of proper viscosity.
Stuck or defective piston rings - Install new piston rings.
Valve guides or stems are damaged - Valves must be replaced.
Pistons or cylinder liners are damaged - Check pistons and liners, replace as required.
Coolant temperature is low - Warm up engine as required.
Insufficient engine oil - Add oil to the engine crankcase.
Wrong setting of fuel injection pump timing - Set it up as required.
Worn or broken pistons - Replace the pistons.
Connecting rod is worn or not aligned - Replace or align connecting rod.
Low battery capacity - Battery needs to be recharged.
Battery drains quickly - Service charging system or replace battery.
Faulty battery terminals or disconnected cables - Check cables and clean or change terminals.
Battery is discharged or worn - Charge or change the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery power - Charge the battery.
Defective starter motor - Repair or change starter.
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