Cat C3.6 Troubleshooting
| Engine Model: Caterpillar C3.6 |
| Engine Type: 4-stroke in-line 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 220 cu.in (3.6 L) |
| Rated Engine Power: 74-134 Hp (55-100 kW) at 2300 rpm |
| Fuel System Type: Common rail direct injection |
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| Engine hard to start or won't start |
Fuel filter element clogging - Replace the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are faulty or clogged - Replace injection nozzles.
Faulty fuel injection pump - Rebuild or replace pump.
Valve timing is improper - Use correct valve timing adjustment.
Clogged fuel pipes - Clean or replace fuel pipes.
Injection timing is improper - Check injection timing adjustment.
Cylinder or piston rings are worn - Replace defective parts.
| Engine starts but stalls immediately |
Clogged fuel filter - Replace filter element.
Fuel injection pump is defective - Rebuild or install a new injection pump.
Dirty air filter - Change air filter element.
Nozzle opening pressure is improper - Adjust according to specifications.
| Engine stalls during operation |
Fuel injection timing is wrong - Set up as recommended.
Fuel filter element is dirty - Replace the filter element.
Engine is not warmed up to the required temperature - Normalize the temperature by warming up the engine.
Defective or stuck injection nozzles - Clean or change injection nozzles.
| Engine stops at low idle speed |
Incorrect low idle setting - Correct low idle adjustment.
The valve clearance is not adjusted - Have it adjusted.
Fuel injection pump is defective - Replacement or repair required.
| Diesel engine is losing power |
Clogged injection nozzle - Test injection nozzles and change if necessary.
Dirt in the fuel lines or hoses - Clean fuel hoses and lines.
Dirty air filter element - Carry out maintenance on air filter.
Blown cylinder head gasket - Replace the gasket as required.
Incorrect injection timing - Use correct injection timing adjustment.
Fuel injection pump is damaged - Repair or install a new fuel pump.
One of moving engine components has failed - Repair or replace defective components.
Faulty radiator cap or dirty radiator fins - Clean radiator or change cap.
Engine coolant is insufficient - Refill to the correct level and inspect system for leaks.
Fan belt is loose or defective - If necessary, replace the belt.
Engine oil level low - Fill the crankcase with engine oil.
Blown cylinder head gasket - Install a new gasket.
Unadjusted injection timing - Set up as recommended.
Engine oil insufficient - Need to add oil.
Oil pump is defective - Install a new pump.
Oil filter element clogged - Replace or clean engine oil filter element.
Relief valve is stuck or broken - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
| High engine oil consumption |
Oil leaks: Defective seals or gaskets - New components need to be installed.
Incorrect oil viscosity - Use proper viscosity oil.
Piston rings are stuck or worn - Piston rings need to be replaced.
Worn valve stems and valve guides - Valves must be replaced.
Worn pistons or cylinder liners - Check pistons and liners, change as required.
Engine is not preheated - Engine is not warmed up to the required temperature.
Lack of engine oil - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Adjust the pump as required.
Pistons are worn or broken - Replace the pistons.
Connecting rod is misaligned or defective - Replace or align connecting rod.
Low battery output - Battery is drained, recharge it.
Battery is draining quickly - Service battery or replace it.
Disconnected wiring or bad battery terminals - Connect cables properly or replace terminals.
| Starter motor is not working |
Battery is drained or worn - Replace or charge as required.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery power - Low battery charging, charge as required.
Faulty starter motor - Change or repair starter.
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