Cat 3406A Troubleshooting
| Engine Model: Caterpillar 3406A |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 893 cu.in (14.6 L) |
| Rated Engine Power: 250-425 Hp (186-317 kW) at 2000 rpm |
| Aspiration Type: Naturally aspirated or turbocharged |
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| Engine hard to start or will not start |
Fuel filter plugging - Service the filter.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are damaged or dirty - Check and replace nozzles if required.
Fuel injection pump is broken - Replace or rebuild injection pump.
Valve timing is wrong - Correct or replace timing gear.
Fuel pipes are plugged - Service or change fuel pipes.
Injection timing is improper - Adjust as recommended.
Damaged piston rings and cylinder - Change faulty components.
| Diesel starts but then stops |
Fuel filter element is clogged - Change the filter element.
Fuel injection pump is defective - Replace injection pump or repair it.
Air filter clogged - Carry out maintenance on air filter.
Nozzle opening pressure is incorrect - Adjust as required.
| Engine shuts off suddenly while running |
Wrong setting of fuel injection pump timing - Adjust as recommended.
Fuel filter plugged - Replace filter element.
Engine not warmed up - Engine is not warmed up to the required temperature.
Stuck or clogged injection nozzle - Check injection nozzles and replace if required.
| Engine shuts off while idling |
Low idle speed setting is not correct - Correct the settings.
Valve clearance is out of adjustment - Adjust valve clearance.
Fuel injection pump is broken - Install a new fuel pump or repair.
Dirty or damaged injection nozzles - Check injection nozzles and replace if required.
Fuel lines or hoses are dirty - Clean fuel system lines and hoses.
Plugged air filter - Clean air cleaner element.
Cylinder head gasket is damaged - Install a new gasket.
Incorrect injection timing - Check injection timing adjustment.
Faulty fuel injection pump - Replace or repair injection pump.
One of moving engine parts has broken - Repair or replace defective parts.
Radiator core is clogged or radiator cap is leaking - Clean radiator or change cap.
Not enough coolant - Fill radiator to proper level and check components for faults.
Damaged or worn fan belt - Change the fan belt.
Engine oil insufficient - Fill up the oil to required level.
Cylinder head gasket defective - Replace cylinder head gasket.
Improper injection timing - Adjust according to specifications.
Engine oil level low - Fill crankcase to proper oil level.
Oil pump is worn or damaged - Repair or replace.
Oil filter is clogged - Replace or service engine oil filter.
Relief valve is stuck or worn - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Check and replace or repair defective parts.
| Engine oil consumption is too high |
Oil leakage: Gaskets or seals can be faulty - Change to repair leaks.
Incorrect oil viscosity - Fill up with the proper oil viscosity.
Damaged or seized piston rings - Piston rings replacement required.
Damaged valve guides or valve stems - Install new valves.
Damaged pistons or cylinder liners - Check pistons and liners, change as required.
Engine is cold - Warm up engine as required.
Engine oil level is low - Need to add engine oil.
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Broken or worn pistons - Replace the pistons.
Faulty or misaligned connecting rod - Need to change or align the connecting rod.
Battery voltage is low - Battery is drained, recharge it.
Battery does not hold charge - Service charging system or install new battery.
Terminals are faulty or battery cables are disconnected - Connect wires properly or change terminals.
Battery is low or faulty - Change or recharge battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery voltage - Charge the battery.
Defective starter motor - Starter should be replaced.
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