The pin for the auxiliary rocker arm, designated by code K 28020, is a vital fastening element that secures the auxiliary rocker arm K 28015 in the valve mechanism assembly of the ZV40/48 engine. Constructed to provide optimal fit and alignment, this pin ensures precise positioning and movement of the rocker arm, thereby reducing friction and preventing premature wear. Manufactured from high-strength materials, it is engineered to maintain structural integrity even under intense mechanical load, playing a crucial role in sustaining the valve train's functionality.