Cat C4.4 ACERT Troubleshooting
| Engine Model: Caterpillar C4.4 ACERT |
| Engine Type: 4-cycle inline 4-cylinder common-rail direct injection liquid-cooled diesel |
| Total Displacement: 268 cu.in (4.4 L) |
| Rated Engine Power: 70-140 Hp (52-104 kW) at 2200 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts hard or won't start |
Dirty fuel filter - Clean or replace the filter.
Air in fuel system - Bleed fuel system.
Clogged or defective injection nozzles - Check and replace nozzles if required.
Damaged fuel injection pump - Repair or install a new fuel pump.
Improper valve timing - Set the valve timing correctly.
Restricted fuel pipes - Clean fuel pipes.
Injection timing is improper - Set the injection timing correctly.
Damaged piston rings and cylinder - Change defective components.
| Engine starts but then stops |
Fuel filter plugging - Change filter element.
Faulty fuel injection pump - Replacement or repair required.
Clogged air filter element - Carry out maintenance on air filter.
Nozzle opening pressure is improper - Adjust as recommended.
| Engine stalls while running |
Fuel injection timing is not adjusted - Set it up as required.
Fuel filter plugging - Service the filter.
Low coolant temperature - Warm up engine as required.
Stuck or burnt injection nozzle - Clean or replace injection nozzles.
| Engine stalls when idling |
Too low idle RPM - Need to adjust idle speed.
Valve clearance is not correct - Correct valve clearance.
Faulty fuel injection pump - Repair or install new pump.
Defective or clogged injection nozzle - Clean or change injection nozzles.
Fuel hoses or lines are dirty - Fuel lines and hoses need to be cleaned.
Air filter is clogged - Service or replace the air filter.
Damaged cylinder-head gasket - Change cylinder head gasket.
Improper injection timing - Check injection timing adjustment.
Fuel injection pump failure - Repair or change injection pump.
One of moving engine parts has broken - Replace or repair damaged components.
Dirty radiator core or faulty radiator cap - Clean radiator or install new cap.
Lack of coolant in cooling system - Fill radiator to proper level and check components for faults.
Excessive wear of the fan belt - Install new fan belt.
Lack of engine oil - Fill up the engine oil.
Blown cylinder head gasket - Replace cylinder head gasket.
Wrong injection timing - Check injection timing adjustment.
Insufficient engine oil - Add oil to the engine crankcase.
Oil pump is defective - Inspect and change as required.
Oil filter is dirty - Service or change engine oil filter element.
Worn or dirty relief valve - Change or service relief valve.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Clearance of crankpin bearing is excessive - Inspect and change or repair worn components.
Oil leaking: Worn gaskets or seals - Worn parts need to be replaced.
Oil viscosity is incorrect - Use oil of correct viscosity.
Worn or broken piston rings - Install new piston rings.
Valve stems or guides are damaged - Replace the valves.
Cylinder liners or pistons are scuffed - Inspect pistons and liners, change as required.
Coolant temperature is low - Normalize the temperature by warming up the engine.
Engine oil insufficient - Fill the crankcase with engine oil.
Fuel injection pump timing is wrong - Set up as recommended.
Worn or scored pistons - Replace the pistons.
Faulty or misaligned connecting rod - Need to replace or align the connecting rod.
Battery capacity is low - Recharge the battery.
Battery runs out quickly - Service charging system or change battery.
Terminals are faulty or battery cables are disconnected - Connect wiring properly or install new terminals.
Battery is discharged or defective - Charge or replace the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery power - Charge the battery.
Starter motor is damaged - Repair or install a new starter.
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