Cat C11 ACERT Troubleshooting
| Engine Model: Caterpillar C11 ACERT |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 677 cu.in (11.1 L) |
| Rated Engine Power: 325-450 Hp (242-336 kW) at 2100 rpm |
| Fuel System Type: Unit Injection |
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| Engine difficult to start or won't start |
Fuel filter element is clogged - Service the filter.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are dirty or defective - Check and replace nozzles if required.
Faulty fuel injection pump - Replace injection pump or repair it.
Incorrect valve timing - Use correct valve timing adjustment.
Plugged fuel pipes - Service or change fuel pipes.
Injection timing is out of adjustment - Adjust as recommended.
Excessive wear of piston rings and cylinder - Replace defective parts.
| Diesel starts but then stops |
Fuel filter plugging - Filter maintenance required.
Fuel injection pump damage - Replacement or repair required.
Dirty air filter - Replace air filter element.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine shuts off suddenly while running |
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Fuel filter plugged - Clean or replace the filter.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Repair or replace injection nozzles.
| Engine shuts off while idling |
Improperly adjusted low idle speed - Correct low idle settings.
Excessive valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump failure - Install a new pump or rebuild.
Fuel injection nozzles are damaged or dirty - Service or change injection nozzles.
Dirty fuel lines or hoses - Clean fuel system hoses and lines.
Clogged air filter element - Clean or change.
Cylinder head gasket defective - Change cylinder head gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Fuel injection pump malfunctioning - Replacement or repair required.
One of moving engine components is worn - Repair or replace defective parts.
Dirty radiator fins or defective radiator cap - Clean radiator or replace cap.
Coolant level is low - Add coolant and check the components of cooling system.
Excessive wear of the fan belt - Fan belt must be replaced.
Engine oil level is low - Fill up the oil to required level.
Defective cylinder head gasket - Install a new gasket.
Improper injection timing - Adjust as recommended.
| Insufficient oil pressure |
Insufficient engine oil - Add oil as required.
Oil pump malfunction - Inspect and change as required.
Engine oil filter is plugged - Service or change engine oil filter element.
Relief valve is stuck or broken - Change or service relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
| Excessive oil consumption |
Oil leaks: Worn seals or gaskets - Replace worn parts to avoid leaks.
Oil viscosity is incorrect - Use correct viscosity oil.
Piston rings are stuck or broken - Piston rings need to be replaced.
Valve stems and guides are worn - Change the valves.
Scuffed pistons or cylinder liners - Check pistons and liners, install new parts as required.
| Abnormal engine noise or knocking |
Engine is cold - Engine is not warmed up to the required temperature.
Engine oil level low - Fill up the engine oil.
Fuel injection pump timing is not adjusted - Use the correct fuel injection pump timing adjustment.
Pistons are worn or broken - Replace the pistons as required.
Faulty or misaligned connecting rod - Need to change or align the connecting rod.
Battery voltage is low - Low battery charging, charge as required.
Battery will not hold charge - Service or replace the battery.
Battery cables are disconnected or terminals are faulty - Connect cables correctly or replace terminals.
Battery is discharged or worn - Replace or charge as required.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery capacity is low - Battery is drained, charge it.
Starter motor is damaged - Repair or replace starter.
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