Cummins ISX12 Troubleshooting
| Engine Model: Cummins ISX12 |
| Engine Type: 4-cycle inline 6-cylinder Extreme Pressure Injection liquid-cooled diesel |
| Total Displacement: 726 cu.in (11.9 L) |
| Rated Engine Power: 345-500 Hp (257-373 kW) at 2100 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine starts hard or doesn't start |
Fuel filter plugging - Filter maintenance required.
Air in fuel system - Bleed fuel system.
Dirty or faulty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel injection pump is damaged - Replace injection pump or repair it.
Valve timing is incorrect - Use correct valve timing adjustment.
Fuel pipes clogging - Service fuel pipes.
Improper injection timing - Adjust as recommended.
Damaged piston rings and cylinder - Change defective components.
| Engine starts and stalls suddenly |
Fuel filter element is clogged - Clean or change the filter.
Fuel injection pump damage - Replace or repair injection pump.
Air filter is clogged - Clean or change.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine stalls after running |
Fuel injection timing is not adjusted - Set the fuel pump timing correctly.
Fuel filter element clogging - Clean or change the filter.
Low coolant temperature - Warm up the engine.
Stuck or clogged injection nozzle - Check injection nozzles and replace if required.
| Engine stalls when idling |
Low idle speed adjustment is incorrect - Adjust the low idle speed.
Excessive valve clearance - Need to adjust valve clearance.
Fuel injection pump is damaged - Rebuild or install a new injection pump.
Dirty or damaged injection nozzles - Service or change injection nozzles.
Fuel lines or hoses are clogged - Fuel lines and hoses need to be cleaned.
Clogged air cleaner - Service air cleaner.
Damaged cylinder-head gasket - Gasket should be replaced.
Unadjusted injection timing - Set the injection timing correctly.
Fuel injection pump failure - Change pump or rebuild it.
One of moving engine components is worn - Replace or repair damaged components.
Dirty radiator fins or faulty radiator cap - Clean radiator or install new cap.
Coolant level is low - The cooling system needs to be refilled and checked for faults.
Fan belt is broken or worn - Replace the fan belt.
Low engine oil level - Check and refill engine oil.
Cylinder-head gasket is leaking - Cylinder-head gasket replacement required.
Improper injection timing - Adjust as recommended.
| Insufficient oil pressure |
Not enough oil in the engine - Check oil level and add oil as required.
Oil pump malfunction - Replace as required.
Oil filter element clogging - Service or replace engine oil filter.
Stuck or defective relief valve - Change or clean relief valve.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Excessive oil consumption |
Oil leakage: Damaged gaskets or seals - Install new components.
Wrong oil viscosity - Fill up with the correct oil viscosity.
Worn or broken piston rings - Change the piston rings as required.
Valve guides or stems are damaged - Valves replacement required.
Worn pistons or cylinder liners - Inspect liners and pistons, change as necessary.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Engine oil level low - Fill up the oil to required level.
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Scored or worn pistons - Pistons need to be replaced.
Connecting rod is worn or misaligned - Replace or align connecting rod.
Low battery output voltage - Charge the battery.
Battery is draining quickly - Service battery or change it.
Wires are disconnected or battery terminals are corroded - Connect wiring properly or install new terminals.
Battery is low or faulty - Change or recharge battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery capacity - Battery is drained, recharge it.
Faulty starter motor - Repair or replace starter.
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