Cat 3406B Troubleshooting
| Engine Model: Caterpillar 3406B |
| Engine Type: 4-cycle inline 6-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 893 cu.in (14.6 L) |
| Rated Engine Power: 255-475 Hp (190-354 kW) at 2000 rpm |
| Fuel System Type: Mechanical unit injector |
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| Engine hard to start or will not start |
Fuel filter plugged - Clean the filter element.
Air in fuel system - Bleed fuel system.
Defective injection nozzle - Test injection nozzles and change if necessary.
Damaged fuel injection pump - Rebuild or replace pump.
Improper valve timing - Correct or change timing gear.
Fuel pipes are clogged - Clean or replace fuel pipes.
Unadjusted injection timing - Adjust according to specifications.
Worn piston rings and cylinder - Change defective parts.
| Diesel starts but stalls suddenly |
Fuel filter element is dirty - Install new filter element.
Fuel injection pump malfunctioning - Repair or replace injection pump.
Plugged air filter - Install new air filter element.
Nozzle opening pressure is improper - Set up as recommended.
| Engine stops unexpectedly during operation |
Fuel injection timing is not adjusted - Adjust as recommended.
Dirty fuel filter - Filter maintenance required.
Engine is not warmed up to the required temperature - Normalize the temperature by warming up the engine.
Defective or stuck injection nozzles - Clean or replace injection nozzles.
| Engine shuts off while idling |
Low idle speed setting is not correct - Adjust as required.
Valve clearance is not correct - Check and adjust as required.
Fuel injection pump is defective - Repair or replace injection pump.
| Engine power is insufficient |
Faulty or dirty injection nozzles - Test injection nozzles and change if necessary.
Fuel lines or hoses clogging - Clean fuel lines and hoses.
Clogged air cleaner - Service or replace the air filter.
Defective cylinder head gasket - Replace the gasket as required.
Injection timing is out of adjustment - Set up as recommended.
Faulty fuel injection pump - Repair or replace injection pump.
One of moving engine parts has broken - Repair or replace defective components.
Radiator core is clogged or radiator cap is leaking - Replace cap or clean radiator.
Low coolant level - Add coolant fluid to cooling system and also check it for leaks.
Loose or damaged fan belt - Replace the fan belt.
Insufficient engine oil - Add oil to the engine crankcase.
Leaking cylinder head gasket - Replace the gasket as required.
Improper injection timing - Adjust according to specifications.
| Oil pressure is insufficient |
Oil level is low - Check and refill the oil.
Worn oil pump - Replace as required.
Oil filter element clogging - Clean or change engine oil filter.
Worn or dirty relief valve - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Diesel engine using too much oil |
Oil leaks: Defective seals or gaskets - New components need to be installed.
Improper oil viscosity - Use proper viscosity oil.
Seized or wear piston rings - Piston rings replacement required.
Valve stems and guides are worn - Valves replacement required.
Cylinder liners or pistons are scored - Inspect liners and pistons, replace as necessary.
Low coolant temperature - Warm up to required temperature.
Engine oil level is insufficient - Fill up the oil to required level.
Improper fuel injection timing - Set it up as required.
Broken or worn pistons - Pistons need to be replaced.
Misaligned or defective connecting rod - Align or change connecting rod.
Low battery capacity - Recharge the battery.
Battery is draining quickly - Service or replace the battery.
Disconnected battery cables or bad terminals - Connect wires correctly or change terminals.
Battery is discharged or defective - Replace or charge as required.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery capacity is low - Recharge the battery.
Starter motor failing - Repair or install a new starter.
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