Cat 3406 Troubleshooting
| Engine Model: Caterpillar 3406 |
| Engine Type: 4-cycle inline 6-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 893 cu.in (14.6 L) |
| Rated Engine Power: 255-482 Hp (190-359 kW) at 2000 rpm |
| Fuel System Type: Mechanical unit injector |
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| Engine difficult to start or doesn't start |
Fuel filter plugging - Service or replace the filter.
Air in fuel system - Bleed fuel system.
Faulty fuel injection nozzles - Service or change injection nozzles.
Fuel injection pump failure - Replace or repair injection pump.
Improper valve timing - Use correct valve timing adjustment.
Restricted fuel pipes - Service or replace fuel pipes.
Wrong injection timing - Adjust injection timing as required.
Worn piston rings and cylinder - Replace defective parts.
| Engine starts and stops suddenly |
Fuel filter plugged - Clean or replace the filter.
Fuel injection pump damage - Replace or repair injection pump.
Air filter is dirty - Clean or change.
Nozzle opening pressure is improper - Adjust according to specifications.
| Engine shuts off suddenly during operation |
Fuel injection timing is not adjusted - Set the fuel pump timing correctly.
Fuel filter plugged - Clean or change the filter.
Low coolant temperature - Warm up the engine.
Stuck or clogged injection nozzle - Clean or change injection nozzles.
Incorrect low idle setting - Correct low idle adjustment.
Valve clearance is not correct - Need to adjust valve clearance.
Defective fuel injection pump - Change or repair the pump.
Faulty or dirty injection nozzles - Check injection nozzles and replace if required.
Fuel lines or hoses are dirty - Clean fuel lines and hoses.
Restricted intake air - Clean or replace the element.
Blown cylinder head gasket - Cylinder-head gasket replacement required.
Unadjusted injection timing - Set up as recommended.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
Any of moving engine components is faulty - Replace or repair damaged components.
Dirty radiator fins or defective radiator cap - Change cap or clean radiator.
Not enough coolant - Refill to the correct level and inspect system for leaks.
Damaged or worn fan belt - Change as required.
Engine oil level is low - Need to add engine oil.
Cylinder head gasket is damaged - Change cylinder head gasket.
Wrong injection timing - Use correct injection timing adjustment.
Engine oil level low - Fill the crankcase with oil.
Oil pump malfunction - Repair or change.
Clogged oil filter - Clean or change engine oil filter.
Relief valve is defective or dirty - Replace or service relief valve.
Excessive crankshaft bearing clearance - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Inspect and change or repair worn components.
| Engine using too much oil |
Oil leaks: Seals or gaskets are wearing excessively - Install new components.
Incorrect oil viscosity - Use oil of proper viscosity.
Seized or wear piston rings - Change piston rings.
Valve guides or stems are damaged - Need to replace the valves.
Pistons or cylinder liners are damaged - Inspect pistons and liners, replace as required.
Engine is not preheated - Normalize the temperature by warming up the engine.
Engine oil insufficient - Fill up the engine oil.
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Worn or scored pistons - Install new pistons.
Connecting rod is defective or not aligned - Connecting rod needs to be aligned or changed.
Battery power is low - Battery is drained, recharge it.
Battery is draining quickly - Battery needs to be serviced or replaced.
Disconnected wiring or bad battery terminals - Check battery wires and service or replace terminals.
Battery is discharged or defective - Battery needs to be recharged or replaced.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery capacity is low - Recharge the battery.
Starter motor failure - Starter should be replaced.
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