Alstom 64OM78P23 Valve Spring Retainer For Paxman Engine

Lock, valve spring retainer (part number 64OM78P23; NSN 2815-01-550-2846) is a precision engine component that secures the valve spring retainer in the valve-train assembly. Manufactured by Viking Incorporated, this item is cataloged under NSN 2815-01-550-2846 with alternates 015502846 and 2815015502846, reflecting cross-reference in military and aerospace catalogs. The listing often denotes a four-pack (4x), indicating multiple retainers per order for maintenance or overhaul projects. As a valve-spring-retainer-lock, its function is to lock the retainer in place on the valve stem, helping maintain valve-seal integrity and stable spring preload during operation. The NSN-catalog cross-reference ensures compatibility with procurement and repair workflows that rely on standardized valve-train components.