1W5829 New Fuel Injector Pencil Nozzle for Caterpillar Engine CAT 9N3979 0R2503
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
| Caterpillar Engine CAT |
Product Overview
Hard starting, smoke, diesel knock or uneven cylinder contribution can be caused by a worn pencil nozzle after compression, pump timing and fuel quality are checked.
This replacement nozzle restores the controlled spray pattern entering the combustion chamber on compatible Caterpillar applications. Match the injector/nozzle reference before service.
Key Features & Performance
- Replacement pencil fuel-injector nozzle for the listed application
- Intended to restore the original function when diagnosis or inspection confirms the existing part is worn, damaged or failed
- Match the original part number, mounting and connections before installation
- Replaces or cross-references 1W5829, 9N3979, 0R2503
Replaces / Cross-References
- 1W5829
- 9N3979
- 0R2503
What Is Included
1 replacement component for this SKU unless the product images or option selection state otherwise.
Fitment Notes
Match the original part number, machine or vehicle model, mounting points, connector or hose/fitting style, and any serial-number restrictions before ordering. When a manufacturer uses multiple revisions within the same model family, the equipment serial number and original component should be the final fitment check.
Frequently Asked Questions
Is this a genuine OEM part?
No, unless the product page specifically states otherwise. This listing is for a replacement, accessory, upgrade or repair component as described above. OE and interchange numbers are provided for identification and fitment reference.
How should I verify fitment before ordering?
Compare the original part number, machine or vehicle model, mounting arrangement and electrical, fuel, coolant or hydraulic connections with the information above. For equipment parts, also verify the machine serial number whenever the manufacturer catalog uses serial breaks.
Part Summary
Keywords: pencil fuel-injector nozzle, Caterpillar Engine CAT, 1W5829, 9N3979, 0R2503.