909635 Separator, breather screen

This breather screen separator is a vital part of the crankcase ventilation system on vintage Harley-Davidsons. It is designed to fit 1936 to 1969 Big Twin models, including Knuckleheads, Panheads, and early Shovelheads. This component serves as a direct replacement for OEM number 25279-36. Proper crankcase breathing is essential for preventing oil leaks and ensuring the engine runs efficiently by managing internal pressure. During a restoration or a top-end service, these screens often need replacing as they can become clogged or damaged over decades of use. These separators are sold as a set of five, providing excellent value for the professional mechanic or the dedicated home restorer. Keeping your vintage Big Twin's breathing system clear is a simple but effective way to maintain engine health and prevent messy oil carry-over issues.