In my Yanmar GM30 there is a lubricating oil suction pipe which the oil is drawn through by means of the lubricating oil pump BEFORE the oil filter. After the filter it is sent up to lubricate the cam shaft.
yes, there is a pipe. At the end of that pipe, where it goes into the engine oil sump, there is a strainer, that prevents big bits from making its way thru the system
We are not primarily on earth to see through one another, but to see one another through
Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs