CATFuel System

7N9843 Nozzle As — Cat 3406

This is a fuel injection nozzle assembly that precisely meters and atomizes diesel fuel into the combustion chamber for optimal engine performance. It is manufactured to meet stringent OEM quality standards, ensuring superior durability and flow characteristics compared to a worn or damaged nozzle. Symptoms of a failing nozzle include rough idling, reduced engine power, increased exhaust smoke, and poor fuel economy.

Nozzle As – Part No 7N9843 – CAT Spare Part
Part Specifications
BrandCAT
CategoryFuel System
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Use clean, filtered fuel — fuel injection components have micron-level tolerances. Prime fuel system before cranking to avoid dry-start damage. Replace fuel filter whenever servicing injection components. Calibrate injectors after replacement if equipment has ECU.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeFuel Injection Nozzle Assembly
MaterialHardened steel alloy
ApplicationEngine fuel injection system
Service LifeReplace every 4,000-6,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of a faulty nozzle include a noticeable drop in engine performance and increased black smoke from the exhaust. If left unaddressed, the issue can lead to uneven cylinder firing, excessive fuel consumption, and potential engine overheating. Continued operation with a compromised nozzle risks severe internal engine damage.

Installation Tip

Ensure the nozzle sealing washer is correctly seated and that no debris is present in the injector bore before installation. Overtightening the nozzle can damage the cylinder head or the nozzle itself.

Service Note

Always replace fuel filters when replacing fuel injection nozzles to prevent contamination.