The thrust washer K 43170 is a precision load-bearing and positioning component designed specifically for the distributing disc K 43169 within the starting device of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its principal function is to absorb and distribute axial forces acting on the distributing disc while maintaining the required axial position and operating clearance necessary for smooth and accurate movement of the starting mechanism. By providing a defined thrust surface between adjacent components, the washer helps prevent direct wear of the distributing disc and surrounding parts while supporting stable operation through repeated starting cycles. Accurate thickness, flatness, surface finish, and wear resistance are particularly important because excessive wear or deformation can change the axial clearance, increase friction, and adversely affect the movement or positioning of the K 43169 distributing disc. During overhaul, the K 43170 and its mating surfaces should therefore be inspected for scoring, wear, deformation, cracking, overheating, or other surface damage. By maintaining controlled axial loading and correct positioning of the distributing disc, the K 43170 thrust washer contributes to smooth starting-device operation, reduced component wear, consistent distribution performance, and reliable long-term operation of the ZV40/48 starting system.