Cat 3306 Troubleshooting
| Engine Model: Caterpillar 3306 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 638 cu.in (10.5 L) |
| Rated Engine Power: 150-300 Hp (112-224 kW) at 2100 rpm |
| Aspiration Type: Naturally aspirated or turbocharged |
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| Engine starts up hard or will not start |
Fuel filter element is clogged - Change filter element.
Air in the fuel system - Air bleeding.
Faulty fuel injection nozzles - Install a new kit of correctly balanced nozzles.
Defective fuel injection pump - Change or repair the pump.
Wrong valve timing - Adjust or replace timing gear.
Dirt in the fuel lines or hoses - Clean or change fuel pipes.
Unadjusted injection timing - Adjust according to specifications.
Piston rings and cylinder are worn - Change faulty parts.
| Diesel starts but immediately stops |
Fuel filter element is clogged - Replace the filter element.
Fuel injection pump is broken - Replace injection pump or repair it.
Intake air restriction - Install new air filter element.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine stalls after running |
Fuel injection timing is wrong - Set the fuel pump timing correctly.
Fuel filter plugged - Change filter element.
Low coolant temperature - Warm up engine as required.
Injection nozzles sticking or clogged - Clean or change injection nozzles.
Too low idle RPM - Test and adjust.
The valve clearance is incorrect - Correct valve clearance.
Fuel injection pump failure - Replacement or repair required.
| Diesel engine is losing power |
Dirty or faulty injection nozzles - Clean or change injection nozzles.
Fuel lines or hoses are clogged - Clean fuel hoses and lines.
Restricted intake air - Clean or replace the element.
Cylinder head gasket defective - Replace the gasket as required.
Incorrect injection timing - Set up as recommended.
Fuel injection pump is damaged - Change or repair the pump.
One of moving engine components has failed - Replace or repair damaged components.
Defective radiator cap or clogged radiator fins - Clean radiator or change cap.
Insufficient coolant fluid - Add coolant and check the components of cooling system.
Fan belt slipping or worn - Belt change is required.
Low engine oil level - Fill the crankcase with engine oil.
Worn cylinder head gasket - Gasket should be replaced.
Wrong injection timing - Adjust injection timing as required.
| Oil pressure is insufficient |
Oil level is insufficient - Fill crankcase to proper oil level.
Oil pump malfunction - Inspect and change as required.
Engine oil filter is plugged - Clean or replace engine oil filter element.
Relief valve is defective or dirty - Change or service relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty parts.
| High engine oil consumption |
Oil leaks: Worn gaskets or seals - Defective components must be replaced.
Crankcase oil too light - Fill up with the correct oil viscosity.
Piston rings are seized or worn - Have piston rings replaced.
Valve stems and guides are worn - Replace the valves.
Worn cylinder liners or pistons - Check liners and pistons, install new components as required.
| Abnormal engine knocking or noise |
Coolant temperature is low - Normalize the temperature by warming up the engine.
Engine oil insufficient - Fill up the engine oil.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Worn or scored pistons - Pistons need to be replaced.
Connecting rod failure or misalignment - Connecting rod needs to be aligned or changed.
Low battery capacity - Battery is drained, recharge it.
Battery discharges quickly - Service charging system or replace battery.
Bad battery terminals or disconnected wiring - Check wiring and clean or replace terminals.
Battery is discharged or worn - Recharge or replace battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output - Battery needs to be recharged.
Starter motor is faulty - Starter should be changed.
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