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Crankcase Breather Filter for Cummins ISX & ISM Engines | Direct Replacement CV50633 & CV50634

High-performance closed crankcase ventilation filter perfectly replaces OEM CV50633 and CV50634, engineered exclusively for Cummins ISX and ISM series heavy-duty diesel truck engines. Multi-layer synthetic coalescing media delivers 99.9% oil mist filtration efficiency, stabilizes crankcase pressure, cuts oil burn, protects turbo & intake systems, and meets strict EPA & Euro emission standards. 1:1 OEM dimensional match for tool-free direct swap installation.

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Premium CV50633 CV50634 Crankcase Breather Filter for Cummins ISX & ISM Engines

Our crankcase breather filter is a precision-engineered direct OEM replacement for part numbers CV50633 and CV50634, purpose-built to service all generations of Cummins ISX and ISM heavy-duty highway diesel engines fitted in Peterbilt, Kenworth, Freightliner, Western Star and other Class 8 semi-trucks. Unlike low-grade aftermarket alternatives, this CCV (Closed Crankcase Ventilation) filter replicates factory performance to resolve blow-by gas issues, control internal engine pressure, and extend your ISX/ISM engine service life dramatically.

Core Functions of This Cummins Crankcase Breather Filter

Ultra-Efficient Oil Mist & Soot Separation

Multi-stage high-density synthetic coalescing filter media traps sub-micron oil droplets, carbon soot and combustion debris from crankcase blow-by gas with 99.9% filtration accuracy. Separated engine oil drains back into the oil pan naturally, drastically lowering oil consumption and eliminating messy oil mist venting from the breather tube.

Stabilize Crankcase Pressure & Stop Seal Failures

A clogged or degraded stock CV50633/CV50634 causes dangerous pressure buildup inside the crankcase, which ruptures gaskets, blows out oil seals, and triggers costly fluid leaks. Our breather filter maintains the exact factory pressure balance required for ISX and ISM engines, preventing premature seal and gasket damage for long-haul fleet reliability.

Full Protection for Turbocharger & Intake Systems

Unfiltered oily blow-by contaminates intercoolers, intake manifolds, turbo bearings and EGR components, creating carbon sludge that robs horsepower, raises fuel use and shortens turbo lifespan. This breather filter blocks oil contaminants before they reach sensitive intake hardware, preserving full engine power and consistent fuel economy.

Compliant Emission Control

Designed to meet EPA 2010+ and Euro 4/Euro 5 heavy-duty emission regulations. By capturing hydrocarbon particulates in blow-by gas, this CV50633/CV50634 replacement filter keeps your truck compliant during DOT and emissions testing without performance tradeoffs.

Exact OEM Cross Reference & Fitment List

Direct Replace OEM Part Numbers:

CV50633, CV50634, 3685528, 4312011, 4312013, 9047904, 3683918

Compatible Engine Models:

Cummins ISX (ISX12, ISX15 all year models)
Cummins ISM heavy-duty diesel engines

Truck Chassis Fit: Freightliner Cascadia, Peterbilt, Kenworth, Western Star, Spartan, Oshkosh heavy commercial vehicles

Build Quality & Construction Specs

Filter Media: Heat-resistant multi-layer synthetic coalescing fiber (resists hot oil vapor degradation up to 130°C)
Housing: Rigid reinforced engineered plastic, shock and vibration resistant for rough highway driving
Seal: Integrated high-temperature fluororubber (Viton) full perimeter gasket – no aftermarket seal leaks, perfect housing sealing on installation
Overall Dimensions: Length 282.6mm, Width 167–277mm, Height 67.5mm (100% OEM matching size for CV50633/CV50634)
Service Interval: Matches OEM schedule – replace every 150,000–180,000 miles for fleet highway use

Simple Drop-In Installation

No modification, cutting or adapter parts needed. This crankcase breather filter is manufactured to identical form, fit and function as original CV50633 and CV50634 units. Simply remove the old clogged filter, seat the integrated gasket evenly, and secure fasteners per Cummins ISX/ISM service manual steps. Professional shop and DIY mechanic friendly.

Why Choose Our CV50633 CV50634 Breather Filter Over Competitors

Zero tolerance dimensional control – eliminates fitment headaches common with cheap generic filters
Longer service life than budget paper-media breathers; synthetic media resists rapid clogging from heavy blow-by
Rigorous factory pressure and filtration testing before shipment, consistent batch quality for bulk fleet orders
Bulk wholesale pricing available for repair shops, truck fleets and parts distributors (OEM/ODM customization supported)
Reliable after-sales support and consistent global stock supply for North American, European and Russian heavy-duty markets

Common Warning Signs You Need to Replace CV50633 / CV50634

Visible oil mist dripping or spraying from crankcase breather outlet
Rising engine oil consumption between oil change intervals
Persistent oil leaks at valve cover, front/rear main seals or gaskets
Reduced engine power, lagging turbo response or increased black smoke
Failed emissions inspection due to elevated blow-by hydrocarbon output
Rough idle caused by unbalanced crankcase pressure

Why Choose Us

1) The products can be made completely according to the customer's requirements, and we have our own factory. 2) High quality product and good price. 3) Good Pre-sale、on sale and after sales service. 4) Short delivery time. 5) Exported all over the world, with rich experience.

Factory Workshop

Listed below are answers to our most commonly asked questions. Don't see your question?Contact our customer service team. We would be glad to assist you.

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FAQ

Listed below are answers to our most commonly asked questions. Don't see your question?Contact our customer service team. We would be glad to assist you.

I have special requirements of the filters . Can I get my products customized?

Yes. Customization is available. You can choose paper quality ,iron thickness ,package method etc. Please send us your requirements, we will meet your requirements.

Are we a trader or a manufacturer?

We are a manufacturer and have our own factory.

How to pack?

Usually we pack items in cartons ,Also Can be packaged according to customer's needs

How long is your delivery time?

If the goods are in stock, generally 5-10 days. Or 15-45 days if the goods are not in stock, according to the quantity

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