Cummins 5417366 Crankcase Breather Assembly

The Cummins 5417366 crankcase breather is an OEM engine component designed for the crankcase ventilation system of 15-liter diesel engines. It functions by separating oil vapor from blow-by gases, returning oil to the sump and venting filtered gases to the intake or atmosphere. This maintains proper crankcase pressure, preventing seal leakage and oil carryover. The assembly integrates a filter element and housing constructed from high-temperature resistant composite materials. It is engineered for EPA17 emission-compliant engines utilizing the XPI fuel system. The part supersedes previous design 5679573 and is interchangeable with part numbers 4974922 and 3692325. Direct replacement for factory mounting points on Cummins X15, ISX12, ISX15, QSX15, and QSK60 engine platforms.