Cat C15-6NZ Troubleshooting
| Engine Model: Caterpillar C15-6NZ |
| Engine Type: 4-cycle inline 6-cylinder direct injection EUI ADEM liquid-cooled diesel |
| Total Displacement: 928 cu.in (15.2 L) |
| Rated Engine Power: 435-550 Hp (324-410 kW) at 2100 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts up hard or doesn't start |
Fuel filter plugging - Service the filter.
Air in fuel tank - Bleed fuel tank.
Defective or clogged injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pump malfunction - Replace injection pump or repair it.
Improper valve timing - Correct or replace timing gear.
Dirty fuel pipes - Service or change fuel pipes.
Injection timing is out of adjustment - Set the injection timing correctly.
Worn piston rings and cylinder - Replace faulty parts.
| Diesel starts but immediately shuts off |
Dirty fuel filter - Clean the filter or install new filter element.
Fuel injection pump is faulty - Replacement or repair required.
Dirty air cleaner - Clean or change.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stalls after running |
Incorrect adjustment of fuel injection pump timing - Set it up as required.
Dirty fuel filter - Install new filter element.
Low coolant temperature - Normalize the temperature by warming up the engine.
Stuck or clogged injection nozzle - Check injection nozzles and replace if required.
| Engine stops while idling |
Low idle speed adjustment is incorrect - Test and adjust.
The valve clearance is incorrect - Adjust valve clearance.
Damaged fuel injection pump - Repair or replace injection pump.
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Clogged fuel hoses or lines - Fuel hoses and lines must be clean.
Dirty air filter - Air filter maintenance required.
Leaking cylinder head gasket - Change cylinder head gasket.
Injection timing is out of adjustment - Set up as recommended.
Fuel injection pump failure - Replace or rebuild injection pump.
Any of moving engine parts is worn - Replace or repair damaged components.
Dirty radiator fins or faulty radiator cap - Clean radiator or replace cap.
Lack of coolant in cooling system - Add coolant fluid and inspect the cooling system for leaks.
Fan belt is broken or worn - Change the fan belt.
Insufficient engine oil - Need to add engine oil.
Cylinder head gasket defective - Replace the gasket as required.
Injection timing is incorrect - Set the injection timing correctly.
| Oil pressure is insufficient |
Engine oil level low - Fill crankcase to proper oil level.
Oil pump is worn or damaged - Replace as required.
Dirty oil filter element - Replace or service engine oil filter.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Diesel engine using too much oil |
External oil leaks: Damaged seals or gaskets - Replace to repair leaks.
Improper oil viscosity - Use oil of correct viscosity.
Piston rings are seized or worn - Install new piston rings.
Damaged valve guides or valve stems - Install new valves.
Scored pistons or cylinder liners - Inspect pistons and liners, change as required.
| Engine knocking sound or abnormal noise |
Engine is not warmed up to the required temperature - Normalize the temperature by warming up the engine.
Engine oil level is low - Fill the crankcase with engine oil.
Fuel injection pump timing is not adjusted - Set it up as required.
Pistons are scored or worn - Pistons replacement required.
Misaligned or faulty connecting rod - Need to align or replace the connecting rod.
| Starter motor cranks slow |
Low battery capacity - Battery needs to be recharged.
Battery will not hold charge - Service charging system or change battery.
Disconnected battery cables or bad terminals - Check cable connections and replace or service terminals.
Battery is drained or defective - Charge or replace the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery voltage is low - Recharge the battery.
Starter motor is defective - Repair or install a new starter.
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