7W-7026 0R-3423 Fuel Valve Nozzle for Caterpillar 3406B 3412

7W-7026 Fuel Injector Nozzle Assembly

The 7W-7026 is a new aftermarket pencil-type fuel injector nozzle assembly for selected Caterpillar 3400 Series diesel engines. It regulates and directs fuel into the combustion chamber to support the required spray pattern and combustion performance.

This product is supplied as the complete long-body fuel valve nozzle assembly shown in the product images. It is not a separate internal nozzle tip. Reference numbers commonly used for checking include 0R-3423 and 0R-1746.

Engine and Machine Fitment Check

The strongest application references are Caterpillar 3406B, 3406C, 3412 and 3412C engines, together with D9R and D9 GC track-type tractors. Selected 3408, 3408C and 3408E applications may also use this nozzle configuration when the original part number and fuel-system arrangement match.

Do not confirm the injector by engine family alone. Compare the number on the removed nozzle and provide the complete engine serial number because fuel nozzle specifications can vary by engine arrangement, horsepower rating and production period.

Installation and Fuel-System Checks

The fuel system should be cleaned before installation. Inspect the fuel lines, filters, nozzle seating area and related sealing components to prevent contamination or leakage from damaging the replacement nozzle.

When several cylinders require replacement, use nozzles with consistent specification and supply source. The completed installation should be checked for fuel leakage, cylinder balance, exhaust smoke and stable engine operation before the machine returns to service.

FAQ

Is this a nozzle tip only?

No. This product is the complete pencil-type fuel valve nozzle assembly shown in the product images, not a separate internal nozzle tip.

Is this a genuine Cat Reman 0R-3423 injector?

No. This listing is for a new aftermarket 7W-7026 replacement. The 0R-3423 number is used as a Cat Reman checking reference.

What information should I provide before ordering?

Provide the engine model, complete engine serial number, old nozzle number and clear photos of the removed fuel nozzle from both ends and the side.