Cat 3512C Troubleshooting
| Engine Model: Caterpillar 3512C |
| Engine Type: 4-stroke 12-cylinder V-block turbocharged liquid-cooled diesel |
| Total Displacement: 3,158 cu.in (51.8 L) |
| Rated Engine Power: 1,280-2,366 Hp (954-1,765 kW) at 1800 rpm |
| Fuel System Type: Electronic Unit Injector |
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| Engine difficult to start or doesn't start |
Dirty fuel filter - Change the filter element.
Air in fuel tank - Bleed fuel tank.
Clogged injection nozzle - Install a new kit of correctly balanced nozzles.
Fuel injection pump is not working correctly - Install a new pump or rebuild.
Valve timing is incorrect - Adjust or replace timing gear.
Plugged fuel pipes - Service or replace fuel pipes.
Wrong injection timing - Use correct injection timing adjustment.
Excessive wear of piston rings and cylinder - Change faulty components.
| Diesel starts but stalls suddenly |
Fuel filter plugged - Change filter element.
Fuel injection pump is not operating properly - Replace injection pump or repair it.
Plugged air filter - Install new air filter element.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stops running suddenly |
Wrong setting of fuel injection pump timing - Set it up as required.
Clogged fuel filter - Replace filter element.
Low coolant temperature - Warm up the engine.
Stuck or burnt injection nozzle - Change or repair injection nozzles.
Incorrect low idle setting - Adjust the low idle speed.
Valve clearance is not correct - Adjust valve clearance according to specifications.
Fuel injection pump is broken - Change pump or rebuild it.
| Diesel engine loses power |
Fuel injection nozzles are faulty or clogged - Replace injection nozzles.
Fuel lines or hoses clogging - Service fuel hoses and lines.
Plugged air cleaner - Clean air cleaner element.
Leaking cylinder head gasket - Install a new gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
One of moving engine parts is faulty - Repair or replace defective parts.
Clogged radiator fins or leaking radiator cap - Replace cap or clean radiator.
Insufficient coolant fluid - Add coolant and check the components of cooling system.
Loose or damaged fan belt - Belt replacement is recommended.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Adjust injection timing as required.
Low oil level - Fill crankcase to proper oil level.
Oil pump is defective - Check and replace if necessary.
Oil filter clogged - Replace or service engine oil filter.
Relief valve is stuck or worn - Replace or service relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Test and replace or repair worn components.
Oil leaks: Gaskets or seals may be damaged - Replace defective parts.
Oil viscosity is wrong - Use oil of correct viscosity.
Stuck or defective piston rings - Piston rings replacement required.
Worn valve guides and valve stems - Valves must be replaced.
Cylinder liners or pistons are damaged - Inspect pistons and liners, change as required.
Engine is not preheated - Warm up the engine.
Engine oil insufficient - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Adjust as recommended.
Scored or worn pistons - Have pistons replaced.
Connecting rod failure or misalignment - Connecting rod must be aligned or replaced.
Low battery output voltage - Recharge the battery.
Battery will not hold charge - Service charging system or install new battery.
Battery terminals are corroded or wires are disconnected - Connect wiring properly or install new terminals.
Battery is drained or defective - Replace or charge as required.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery power is low - Low battery charging, charge as required.
Damaged starter motor - Change or repair starter.
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