The starting knock of R4102 D.I. diesel engine are analyzed experimentally based on the transient speed and first and third cylinder indicator diagrams that were taken from updated data acquisition system developed by the authors. The influence of the starting knock on the strength of connecting rod, piston and piston ring are also studied. The results show that the influence of the starting knock is larger than the influence of the rated conditions. So the starting knock must be thought in the engine design.