Cat 3406 DITA Troubleshooting
| Engine Model: Caterpillar 3406 DITA |
| Engine Type: 4-cycle inline 6-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 893 cu.in (14.6 L) |
| Rated Engine Power: 375-465 Hp (280-347 kW) at 2000 rpm |
| Fuel System Type: Electronic unit injector (EUI) |
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| Diesel engine hard to start or doesn't start |
Fuel filter plugged - Filter maintenance required.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Fuel injection pump is not working correctly - Install a new fuel pump or repair.
Valve timing is out of adjustment - Adjust or replace timing gear.
Plugged fuel pipes - Clean fuel pipes.
Wrong injection timing - Set up as recommended.
Piston rings and cylinder are worn - Replace defective parts.
| Engine starts but immediately stalls |
Fuel filter element clogging - Clean or replace the filter.
Fuel injection pump is damaged - Repair or change injection pump.
Air filter is dirty - Clean air cleaner element.
Improper nozzle opening pressure - Adjust according to specifications.
| Engine stops unexpectedly during operation |
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Dirty fuel filter - Service or replace the filter.
Coolant temperature is low - Warm up the engine.
Defective or stuck injection nozzles - Service or change injection nozzles.
Low idle speed set incorrectly - Correct low idle adjustment.
Incorrect valve clearance - Correct valve clearance.
Fuel injection pump is broken - Repair or install a new fuel pump.
Clogged injection nozzle - Service or change injection nozzles.
Fuel hoses or lines are dirty - Fuel hoses and lines must be clean.
Dirty air filter - Service air cleaner.
Cylinder head gasket is worn - Install a new gasket.
Injection timing is out of adjustment - Adjust as recommended.
Fuel injection pump malfunctioning - Replace or repair injection pump.
Any of moving engine parts is worn - Repair or replace defective parts.
Clogged radiator fins or leaking radiator cap - Clean radiator or replace cap.
Not enough coolant - Fill radiator to proper level and check components for faults.
Fan belt is broken or worn - Replace the fan belt.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Improper injection timing - Adjust according to specifications.
| Oil pressure is insufficient |
Lack of oil - Add oil to the engine crankcase.
Worn oil pump - Inspect and change as required.
Dirty oil filter element - Service or change engine oil filter element.
Relief valve is stuck or worn - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Excessive oil consumption |
External oil leaks: Worn gaskets or seals - Replace to repair leaks.
Incorrect oil viscosity - Use proper viscosity oil.
Worn or broken piston rings - Piston rings replacement required.
Valve guides and stems are worn - Replace the valves.
Pistons or cylinder liners are damaged - Inspect liners and pistons, change as necessary.
Engine is not preheated - Warm up the engine.
Lack of engine oil - Fill up the oil to required level.
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Scored or worn pistons - Replace the pistons.
Misaligned or defective connecting rod - Align or replace connecting rod.
Low battery output - Charge the battery.
Battery runs out quickly - Service or replace the battery.
Battery cables are disconnected or terminals are faulty - Check cable connections and replace or service terminals.
Battery is drained or worn - Charge or replace the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery capacity - Battery is drained, charge it.
Starter motor failing - Starter should be replaced.
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