BSA 1946 Models Parts Book

' t I · ï. ~ . \ l!((((t . . \\\\\\\\\\\\\\\U / . DRAIN PLUG OIL RETURN PIPE/ OJL SUPPLY PIPE . After lub ricatin g the big-end and circulating throu gh the engine in the form of mist , the oil drains down through a filte r in the bott oni of th e crankcase, from which it is drawn by the return · pump (lower pair of gears) pas t ball valve C, and delivered up the retu rn pipe to the tank, where it pass es.through a filter into the tank its elf. Diagram of the Lubrication System on