sentences:  A delay in the pits on lap 3 for Dickie Dale of 3 minutes and 38 seconds to replace a smashed windscreen allowed Bob McIntyre to regain the lead.An engine failure on lap 4 at Quarry Bends to the Norton of Jackie Wood, caused Dale and Hartle to crash on engine oil left on the road.This allowed Bob McIntyre to comfortably win the 1957 Junior TT Race at an average speed of 94.99 mph.