Cat C18 Troubleshooting
| Engine Model: Caterpillar C18 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 1104.5 cu.in (18.1 L) |
| Rated Engine Power: 600-1,136 Hp (447-847 kW) at 2000 rpm |
| Fuel System Type: Unit Injection |
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| Engine starts up hard or won't start |
Fuel filter plugging - Service or replace the filter.
Air in fuel system - Bleed fuel system.
Faulty or dirty injection nozzles - Change fuel injection nozzles.
Faulty fuel injection pump - Change or repair the pump.
Improper valve timing - Adjust or replace timing gear.
Fuel pipes are plugged - Service or replace fuel pipes.
Injection timing is incorrect - Set the injection timing correctly.
Worn cylinder or piston rings - Change defective components.
| Diesel starts and suddenly stops |
Clogged fuel filter - Filter maintenance required.
Fuel injection pump is not operating properly - Change pump or rebuild it.
Air filter plugged - Change air filter element.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Diesel shuts off while driving |
Incorrect adjustment of fuel injection pump timing - Adjust according to specifications.
Dirty fuel filter - Filter maintenance required.
Engine is not preheated - Warm up to required temperature.
Injection nozzles are burnt or jammed - Clean or replace injection nozzles.
Incorrect low idle setting - Adjust low idling as recommended.
Improper valve clearance - Need to adjust valve clearance.
Fuel injection pump is not working correctly - Rebuild or replace pump.
Defective injection nozzle - Service or change injection nozzles.
Restricted fuel lines or hoses - Clean fuel hoses and lines.
Dirty air cleaner - Clean air cleaner element.
Cylinder head gasket is blown - Install new cylinder head gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Fuel injection pump is defective - Replace injection pump or repair it.
One of moving engine components has failed - Replace or repair damaged components.
Faulty radiator cap or dirty radiator fins - Replace cap or clean radiator.
Low engine coolant - Fill the cooling system and check components for leaks or other faults.
Damaged or worn fan belt - Fan belt must be replaced.
Engine oil level is low - Check and refill engine oil.
Worn cylinder head gasket - Install new cylinder head gasket.
Improper injection timing - Adjust injection timing as required.
Engine oil insufficient - Checking oil level and add if necessary.
Oil pump is damaged - Check and replace if necessary.
Dirty oil filter - Service or change engine oil filter element.
Worn or dirty relief valve - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Excessive oil clearance of crankpin bearing - Check and change or repair defective parts.
| Engine using too much oil |
External oil leaks: Gaskets or seals can be faulty - Replace defective parts.
Wrong oil viscosity - Use oil of proper viscosity.
Piston rings are stuck or broken - Have piston rings replaced.
Worn valve guides and valve stems - Need to replace the valves.
Pistons or cylinder liners are scuffed - Check pistons and liners, install new parts as required.
| Abnormal engine noise or knocking |
Engine is not fully warmed up - Warm up engine as required.
Not enough engine oil - Check oil level and add oil as required.
Improper fuel injection timing - Use the correct fuel injection pump timing adjustment.
Worn or scored pistons - Replace the pistons.
Faulty or misaligned connecting rod - Alignment procedure or replacement is required.
Battery capacity is low - Charge the battery.
Battery discharges quickly - Service charging system or install new battery.
Battery terminals are corroded or wires are disconnected - Check cable connections and replace or service terminals.
Battery is discharged or defective - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Battery is drained, charge it.
Starter motor is defective - Replace or repair starter.
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