Cat C27 ACERT Troubleshooting
| Engine Model: Caterpillar C27 ACERT |
| Engine Type: 4-stroke 12-cylinder V-block turbocharged liquid-cooled diesel |
| Total Displacement: 1649 cu.in (27.0 L) |
| Rated Engine Power: 800-1050 Hp (597-783 kW) at 2100 rpm |
| Fuel System Type: Unit Injection |
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| Engine hard to start or doesn't start |
Dirty fuel filter - Change filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are damaged - If necessary, replace with a new nozzle.
Damaged fuel injection pump - Replace or rebuild injection pump.
Valve timing is improper - Adjust or change timing gear.
Fuel pipes clogging - Service or change fuel pipes.
Incorrect injection timing - Set up as recommended.
Worn cylinder or piston rings - Replace faulty components.
| Diesel starts but then stops |
Dirty fuel filter - Clean or replace the filter.
Fuel injection pump is defective - Repair or install new pump.
Plugged air cleaner - Clean air cleaner element.
Nozzle opening pressure is improper - Adjust as required.
| Engine shuts off suddenly during operation |
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Fuel filter element is dirty - Service or replace the filter.
Engine is not preheated - Warm up the engine.
Injection nozzles are jammed or clogged - Clean or replace injection nozzles.
Incorrectly adjusted low idle speed - Correct low idle settings.
The valve clearance is incorrect - Have it adjusted.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.
Clogged or defective injection nozzles - If necessary, replace with a new nozzle.
Clogged fuel hoses or lines - Clean fuel system lines and hoses.
Plugged air cleaner - Service or replace the air filter.
Cylinder head gasket is defective - Install new cylinder head gasket.
Injection timing is incorrect - Set the injection timing correctly.
Faulty fuel injection pump - Replace injection pump or repair it.
One of moving engine parts has broken - Replace or repair damaged components.
Dirty radiator fins or faulty radiator cap - Install new cap or clean radiator.
Insufficient coolant - Refill to the correct level and inspect system for leaks.
Fan belt slipping or worn - Replace as required.
Not enough engine oil - Need to add engine oil.
Leaking cylinder head gasket - Replace the gasket as required.
Improper injection timing - Check injection timing adjustment.
Lack of oil - Fill crankcase to proper oil level.
Worn oil pump - Repair or change.
Oil filter element clogging - Service or change engine oil filter element.
Relief valve is stuck or worn - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
Oil leakage: Gaskets or seals can be faulty - Replace defective parts.
Incorrect oil viscosity - Use proper viscosity oil.
Stuck or worn piston rings - Install new piston rings.
Damaged valve guides or valve stems - Install new valves.
Scored pistons or cylinder liners - Inspect liners and pistons, fit new parts as necessary.
| Abnormal engine noise or knocking |
Engine is not preheated - Warm up the engine.
Not enough engine oil - Fill the crankcase with engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Pistons are scored or worn - Replace the pistons as required.
Connecting rod is not aligned or worn - Connecting rod must be aligned or replaced.
Battery power is low - Recharge the battery.
Battery is not holding charge - Battery needs to be serviced or replaced.
Disconnected wires or corroded battery terminals - Connect wiring correctly or install new terminals.
Battery is drained or defective - Need to charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery power - Low battery charging, charge as required.
Starter motor is defective - Starter should be replaced.
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