ZELYVER Crankcase Breather Element for Cummins ISX/ISM Engines CV50633/CV50634 - Single Replacement, Oil/Soot Filtration

The ZELYVER CV50633/CV50634 crankcase breather element is a direct-fit replacement filter that captures blow-by contaminants and protects Cummins ISX/ISM engines and compatible heavy-duty trucks.

This breather element is engineered as a service replacement for factory crankcase ventilation systems used on a range of heavy-duty diesel engines and truck makes. It helps trap oil, soot and vapor from crankcase gases to reduce contamination of intake and lubrication systems. Built and tested to meet performance expectations, the part is supplied singly and cross-references multiple OEM numbers for easy fitment checks.

Which engines and trucks will this breather element fit?

The ZELYVER part is designed for late-2000s to early-2010s heavy-duty platforms. Confirm year and engine model before ordering to ensure compatibility.

• Compatible engine: Cummins ISX 15.0 (2010–2012) and ISM variants where specified.
• Supported makes: Kenworth, Peterbilt, Freightliner, International/Navistar, Western Star, Volvo, Spartan, Oshkosh, American LaFrance.
• Recommended for model years listed: typically 2008–2013 depending on manufacturer.
• Cross-reference part numbers supplied to verify exact fit for your chassis.

How does this replacement match factory parts and numbers?

ZELYVER supplies the breather element with multiple cross-reference numbers so you can confirm it replaces the original item on your vehicle. The element is manufactured to align with common OEM dimensions and filtration needs.

• Replaces: 3691476, 904-7904, 99340, CB57 and many listed equivalents.
• Internal ZELYVER references include CV50634, CV50633 and related SKUs for quick identification.
• Check your engine manual or existing filter label to match numbers before purchase.
• Sold as a single replacement unit; inspect seals and mounting hardware during installation.

What performance and quality checks are performed on this breather?

Each unit is tested prior to shipping to ensure it meets basic functional requirements for crankcase ventilation duty. The design focuses on capturing oil and soot particles while allowing proper crankcase venting.

• 100% tested at the factory for fit and basic function before dispatch.
• Media optimized for separating oil mist and particulate from blow-by gases.
• Durable construction to withstand heavy-duty engine bay conditions.
• Packaged as one element per box for straightforward replacement service.

How should I install and maintain the crankcase breather element?

Installation is straightforward for technicians familiar with crankcase ventilation systems. Regular inspection and timely replacement help maintain engine cleanliness and reduce oil contamination risk.

• Follow vehicle OEM service intervals and replace when signs of clogging or oil carryover appear.
• Inspect mounting gaskets, seals and hose connections during replacement.
• Use the cross-reference list to ensure you ordered the correct element for your engine.
• Dispose of the used filter according to local regulations for oil-contaminated parts.

Who is this for: The ZELYVER CV50633/CV50634 crankcase breather element is aimed at fleet managers, service technicians and owner-operators of medium- and heavy-duty trucks who need a reliable replacement for Cummins ISX/ISM ventilation components. It's suitable for workshops and field-service teams maintaining Kenworth, Peterbilt, Freightliner, International, Western Star and other compatible chassis from the specified model years. Always verify the part number match with your engine documentation before purchase. ZELYVER provides a one-year limited warranty and customer support for fitment questions or claim assistance.