180240 – PAI Oil Pressure Relief Valve for Cummins ISX

Description PAI 180240 is a genuine PAI Industries oil pressure relief and lubricating oil filter bypass valve designed as an aftermarket replacement for Cummins part number 4357177 on ISX and QSX engine families. Cummins identifies 4357177 as the updated lubricating oil filter bypass valve / pressure relief valve that supersedes earlier part number 3820320 and is backward compatible with prior lubricating oil cooler housing designs. Installed in the oil cooler housing, this valve helps maintain correct lubrication system pressure and provides controlled bypass of the oil filter when required, supporting reliable protection of critical engine components. Typical applications include heavy-duty on-highway and off-highway engines where Cummins specifies valve 4357177, such as ISX12/11.9, ISX15 and QSX11.9/15 platforms used in trucks, industrial equipment and other power units. Supplied as a complete valve assembly, PAI 180240 offers a cost-effective alternative to OEM while maintaining fit and function for service and overhaul work. • PAI Industries part number: 180240 • OEM cross reference: Cummins 4357177 valve, pressure relief (replaces 3820320) • Application: lubricating oil filter bypass / oil pressure relief valve in Cummins ISX and QSX engines using 4357177 • Direct-fit replacement for the original bypass valve in the engine’s oil cooler housing • Supplied as a single valve assembly; installation follows Cummins service procedures for 4357177