Cat 3306B Troubleshooting
| Engine Model: Caterpillar 3306B |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 638 cu.in (10.5 L) |
| Rated Engine Power: 150-315 Hp (112-235 kW) at 2100 rpm |
| Aspiration Type: Naturally aspirated or turbocharged |
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| Engine hard to start or will not start |
Clogged fuel filter - Filter maintenance required.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - Test injection nozzles and change if necessary.
Faulty fuel injection pump - Rebuild or install a new injection pump.
Valve timing is improper - Correct or change timing gear.
Fuel pipes are dirty - Service or change fuel pipes.
Wrong injection timing - Check injection timing adjustment.
Cylinder or piston rings are worn - Change faulty parts.
| Engine starts but then stalls |
Fuel filter element is clogged - Change filter element.
Fuel injection pump is broken - Install a new pump or rebuild.
Air filter is dirty - Service or replace the air filter.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine stalls while running |
Fuel injection timing is not adjusted - Adjust as recommended.
Fuel filter plugged - Replace the filter element.
Engine not warmed up - Warm up to required temperature.
Injection nozzles sticking or clogged - Service or change injection nozzles.
Incorrect low idle setting - Need to adjust idle speed.
Incorrect valve clearance - Adjustment procedure required.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
Dirty or damaged injection nozzles - Replace injection nozzles.
Dirty fuel hoses or lines - Fuel hoses and lines must be clean.
Air cleaner is dirty - Clean or replace element.
Cylinder-head gasket is broken - Change cylinder head gasket.
Injection timing is wrong - Use correct injection timing adjustment.
Fuel injection pump is broken - Rebuild or replace pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Dirty radiator core or defective radiator cap - Replace cap or clean radiator.
Lack of coolant in cooling system - The cooling system needs to be refilled and checked for faults.
Broken or loose fan belt - Change the fan belt.
Engine oil level low - Check oil level and add oil as required.
Cylinder head gasket is defective - Install a new gasket.
Unadjusted injection timing - Check injection timing adjustment.
Not enough oil in the engine - Add oil as required.
Oil pump is worn or damaged - Check and replace if necessary.
Clogged oil filter - Replace or clean engine oil filter element.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Check and change or repair defective parts.
Excessive crankpin bearing clearance - Inspect and change or repair worn components.
| Engine oil consumption is too high |
Oil leaks: Defective seals or gaskets - Install new components.
Incorrect oil viscosity - Use proper viscosity oil.
Worn or stuck piston rings - Change the piston rings as required.
Valve guides and stems are worn - Valves must be replaced.
Scuffed pistons or cylinder liners - Check liners and pistons, change as required.
| Engine knocking sound or abnormal noise |
Engine is cold - Warm up the engine.
Engine oil insufficient - Check oil level and add oil as required.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Worn or broken pistons - Pistons replacement required.
Connecting rod is misaligned or defective - Need to replace or align the connecting rod.
Battery power is low - Battery needs to be recharged.
Battery drains quickly - Battery needs to be serviced or replaced.
Bad battery terminals or disconnected wiring - Check wiring connections and replace or clean terminals.
| Starter motor is not working |
Battery is drained or worn - Recharge or change battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output voltage - Charge the battery.
Faulty starter motor - Starter should be replaced.
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