ATRACYPART CV50634 Crankcase Breather Filter for Cummins ISX15 (2010–2012) — OE-fit, Oil Vapor Control

ATRACYPART CV50634 is a direct-fit crankcase breather filter designed to replace worn or damaged ISX15 crankcase ventilation units on Cummins ISX engines and compatible heavy-duty trucks.

If your diesel engine is showing signs like oil leaks, elevated idle, or diminished performance, a clogged or failed crankcase breather can be the cause. The ATRACYPART CV50634 is engineered to meet OE form-and-fit standards, offering a replacement that restores proper crankcase ventilation, helps control oil vapor, and fits a wide range of models from Cummins ISX15-powered Volvo, Kenworth, Peterbilt, Freightliner and more.

Which vehicles and engines will this breather work with?

This breather is compatible with 2010–2012 Cummins ISX 15.0 engines and many heavy truck platforms that use that powerplant. It fits a long list of OEM applications across manufacturers.

• Cummins ISX15 (2010–2012)
• Volvo VNL/VT/VN models (2008–2013)
• Kenworth, Peterbilt, Western Star, Freightliner, International, Spartan, Oshkosh, Orion Bus, and others listed for 2008–2013 model years

How does this replacement breather improve engine operation?

Replacing a faulty breather helps stop crankcase pressure buildup and reduces oil leaks and smoke caused by excess blow-by. A properly functioning breather also contributes to steadier idle and more consistent engine performance under load.

• Restores correct crankcase ventilation and pressure balance
• Reduces oil spray and external leaks from the valve cover and seals
• Helps maintain steady idle speed and throttle response

What are the construction and durability features of the CV50634?

The housing is molded from reinforced materials engineered for high-temperature resistance and longer service life. Internal filtration media is designed to trap oil mist and particulates while allowing crankcase gases to vent properly.

• OE-style design for direct-fit replacement and easy installation
• Reinforced housing resists heat and mechanical stress
• Filtration media reduces oil vapor carryover and protects intake components

Will this part match my old part number or OE reference?

The CV50634 is listed as a compatible replacement for several OE part numbers; always verify against the part on your vehicle before purchasing. It has been tested for fit and performance as a replacement element for these references.

• Replaces OE numbers: 904-7904, 99340, CB57, 3685528
• Also cross-references: CV50617, CV50634, CV50633
• Confirm the OEM number on your existing breather before ordering

Who is this for? If you operate or maintain heavy-duty trucks powered by the Cummins ISX15 — including fleets of Volvo, Kenworth, Peterbilt, Western Star, Freightliner, International, Spartan, Oshkosh, Orion, or similar models from the 2008–2013 era — and you need a rugged, OE-style crankcase breather replacement, the ATRACYPART CV50634 is built for your application. It suits mechanics searching for a direct-fit part, fleet managers seeking consistent replacements, and owner-operators needing a durable, serviceable breather that helps control oil vapor and keep engines running smoothly. ATRACYPART backs this product with customer support and a 24-month warranty for replacement or refund if defects appear.

Installation note: Always shut down and cool the engine before replacing the breather. Inspect surrounding hoses and seals for wear, and confirm the OE part number to ensure compatibility.