The spacer sleeve K 28028 is a precision positioning component used within the auxiliary rocker arm assembly K 28015 in the Sulzer ZV40/48 engine. Its primary function is to maintain correct axial spacing and alignment between moving parts, preventing unwanted lateral displacement and ensuring consistent geometry of the valve actuation mechanism. Operating under cyclic loads, vibration, and temperature fluctuations, the spacer sleeve is manufactured from high-strength, wear-resistant materials to ensure long-term dimensional stability. Its precise machining guarantees accurate fit and uniform load distribution, minimizing stress concentrations on adjacent components. By preserving alignment and reducing mechanical wear, the K 28028 spacer sleeve contributes to smooth operation, extended service life, and reliable valve train performance.