I’m certainly a newbie on engine work and apologies if this has been asked many times before but . . . what is the function of the small rubber ball in the oil passage behind the oil pump? Does it act as a kind of valve or is it just a stopping plug? I did put it in when I put my cases back together but I popped it in dry. Should I have oiled it so that it would drop down into the bottom of the oilway? It is not visible but I can feel it with a bent pick. There seems no way to move it but will it drop down when the engine gets hot?
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