Cat 3412E Troubleshooting
| Engine Model: Caterpillar 3412E |
| Engine Type: 4-stroke 12-cylinder V-block turbocharged liquid-cooled diesel |
| Total Displacement: 1,649 cu.in (27.0 L) |
| Rated Engine Power: 475-1400 Hp (352-1,037 kW) at 2300 rpm |
| Fuel System Type: Electronic Unit Injector |
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| Diesel engine hard to start or doesn't start |
Fuel filter element is dirty - Clean or change the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Clean or replace injection nozzles.
Fuel injection pump malfunctioning - Replace or rebuild injection pump.
Incorrect valve timing - Use correct valve timing adjustment.
Clogged fuel pipes - Clean or replace fuel pipes.
Wrong injection timing - Adjust according to specifications.
Worn cylinder or piston rings - Replace defective parts.
| Diesel starts but immediately shuts off |
Fuel filter element is dirty - Change filter element.
Fuel injection pump malfunction - Repair or install new pump.
Clogged air filter - Air filter maintenance required.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine shuts off while running |
Improper setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Service the filter.
Engine not warmed up - Engine is not warmed up to the required temperature.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
| Engine stalls at low idle speed |
Incorrect low idle speed adjustment - Normalize low idle speed.
Valve clearance is not correct - Correct valve clearance.
Fuel injection pump is broken - Repair or install a new fuel pump.
| Diesel engine is losing power |
Clogged or burnt injection nozzle - If necessary, replace with a new nozzle.
Clogged fuel hoses or lines - Service fuel hoses and lines.
Air filter clogged - Replace air filter element.
Cylinder head gasket defective - Replace cylinder head gasket.
Injection timing is incorrect - Check injection timing adjustment.
Fuel injection pump is broken - Repair or change injection pump.
One of moving engine components has failed - Change or repair damaged parts.
Clogged radiator fins or damaged radiator cap - Clean radiator or replace cap.
Engine coolant is insufficient - Top up coolant fluid and check system for leaks.
Excessive wear of the fan belt - Install new fan belt.
Lack of engine oil - Check oil level and add oil as required.
Cylinder-head gasket is leaking - Replace the gasket as required.
Injection timing is improper - Set up as recommended.
Oil level is low - Add oil to the engine crankcase.
Oil pump malfunction - Repair or replace.
Oil filter element clogged - Change or service engine oil filter.
Stuck or defective relief valve - Change or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Engine consuming too much oil |
Oil leakage: Damaged gaskets or seals - New components need to be installed.
Wrong oil viscosity - Use proper viscosity oil.
Damaged or seized piston rings - Piston rings need to be replaced.
Valve guides or stems are damaged - Need to replace the valves.
Pistons or cylinder liners are scored - Inspect liners and pistons, replace as necessary.
| Engine knocking sound or abnormal noise |
Engine is not warmed up to the required temperature - Warm up engine as required.
Lack of engine oil - Need to add engine oil.
Fuel injection pump timing is wrong - Set the fuel pump timing correctly.
Worn or scored pistons - Have pistons replaced.
Connecting rod is not aligned or defective - Need to replace or align the connecting rod.
Battery power is low - Charge the battery.
Battery is not holding charge - Service or change the battery.
Bad battery terminals or disconnected wiring - Connect wires correctly or change terminals.
Battery is drained or worn - Recharge or replace battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery power - Recharge the battery.
Starter motor failing - Starter should be replaced.
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