9L6884 Nozzle for CAT 3406, 3408, 3408C & more

The 9L6884 nozzle is a critical fuel system component that delivers precise amounts of fuel into the engine’s combustion chamber at the correct spray pattern and pressure. This ensures efficient combustion, consistent performance, and reduced emissions in diesel engines.

Here’s a general guide for proper installation:

1. Turn off the engine and disconnect the power source before beginning.
2. Relieve fuel system pressure according to your machine’s service manual instructions.
3. Remove any fuel lines, clamps, or components blocking access to the old nozzle.
4. Carefully disconnect the old nozzle and clean the nozzle seat area.
5. Install the new 9L6884 nozzle, ensuring it seats fully and aligns correctly.
6. Reconnect fuel lines and secure all fasteners.
7. Start the engine and check for proper operation and stable fuel delivery.

The 9L6884 nozzle is designed for use in heavy‑duty diesel engines where this nozzle number is specified, such as certain 3408 series engines. Compatibility depends on your engine type and model, so verify fitment using your service manual or parts reference before ordering. If you are still unsure, reach out to Propel Parts, our team will be happy to help you verify if this part fits your equipment.

Yes, the 9L6884 nozzle is engineered to meet or exceed OEM specifications for fuel delivery accuracy and durability. When replacing fuel system components, choose genuine or high‑quality aftermarket parts that meet or exceed OEM expectations to help ensure dependable performance, efficient combustion, and consistent operation.

Nozzles should be checked as part of routine fuel system maintenance or when performance issues arise. If you notice rough idling, excessive smoke, poor acceleration, or irregular fuel consumption, inspect the nozzle. Replace it if wear, clogging, or spray pattern degradation is evident.

Typical indicators include:

1. Hard starting or frequent misfires
2. Poor fuel economy
3. Rough engine idle or inconsistent power delivery
4. Visible black or white smoke from the exhaust

A quality nozzle ensures precise fuel atomization and delivery, which supports efficient combustion, better power output, and smoother engine operation. Using genuine or high‑quality aftermarket parts that meet or exceed OEM expectations helps reduce the risk of fuel delivery problems, supports reliable engine performance, and contributes to longer engine life.