Cat C3.4B Troubleshooting
| Engine Model: Caterpillar C3.4B |
| Engine Type: 4-cycle inline 4-cylinder common-rail direct injection liquid-cooled diesel |
| Total Displacement: 207.5 cu.in (3.4 L) |
| Rated Engine Power: 70-115 Hp (52-86 kW) at 2400 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts hard or doesn't start |
Fuel filter plugging - Install new filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are dirty or defective - Replace injection nozzles.
Faulty fuel injection pump - Rebuild or change fuel pump.
Wrong valve timing - Set the valve timing correctly.
Clogged fuel pipes - Service or change fuel pipes.
Injection timing is incorrect - Set up as recommended.
Cylinder or piston rings are worn - Replace defective parts.
| Engine starts but then stalls |
Clogged fuel filter - Change filter element.
Faulty fuel injection pump - Replace or repair injection pump.
Dirty air filter element - Clean or replace the element.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine stalls during operation |
Wrong setting of fuel injection pump timing - Adjust fuel injection pump as required.
Dirty fuel filter - Change filter element.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Excessive valve clearance - Adjust valve clearance.
Fuel injection pump failure - Repair or change injection pump.
| Diesel engine is losing power |
Damaged or dirty injection nozzles - Inspect nozzles and replace if necessary.
Fuel hoses or lines are dirty - Service fuel hoses and lines.
Clogged air cleaner - Clean air cleaner element.
Cylinder-head gasket is broken - Change cylinder head gasket.
Injection timing is improper - Adjust according to specifications.
Fuel injection pump failure - Repair or install new pump.
One of moving engine parts has broken - Repair or replace defective components.
Dirty radiator core or faulty radiator cap - Clean radiator or replace cap.
Low engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Loose or defective fan belt - Change as required.
Engine oil insufficient - Fill the crankcase with engine oil.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Incorrect injection timing - Check injection timing adjustment.
| Insufficient oil pressure |
Insufficient engine oil - Check oil level and add oil as required.
Oil pump is defective - Repair or replace.
Dirty oil filter - Service or change engine oil filter element.
Relief valve is defective or dirty - Replace or clean relief valve.
Excessive oil clearance of crankshaft bearing - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Inspect and change or repair worn components.
External oil leaks: Gaskets or seals can be faulty - Change worn parts according to specifications.
Oil viscosity is incorrect - Use oil of proper viscosity.
Worn or broken piston rings - Piston rings replacement required.
Damaged valve guides or valve stems - Replace defective valves.
Worn cylinder liners or pistons - Check liners and pistons, change as required.
| Abnormal engine knocking or noise |
Engine has not warmed up to the recommended temperature - Normalize the temperature by warming up the engine.
Engine oil level low - Check oil level and add oil as required.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Pistons are worn or scored - Pistons replacement required.
Misaligned or defective connecting rod - Align or change connecting rod.
| Starter motor cranks slow |
Low battery voltage - Charge the battery.
Battery is draining quickly - Service or change the battery.
Disconnected battery cables or bad terminals - Check wiring and clean or replace terminals.
| Starter motor is not working |
Battery is low or faulty - Need to charge or replace the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery output - Battery needs to be recharged.
Starter motor failure - Change or repair starter.
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