Well I just had my block rebuilt for 1050$ and the story I got from the shop is that the nubbin is a carbon steel insert which aligns the pump with the block. Of course it is removable but nobody ever does, and it has no sealing value. Yes I did examine the photo and there was *no* gasket (sigh).
Entity Stan Wilder spoke thus: > If you're thinking that the little 'ring' that is just above the > oil pump shaft in the illustration is some type of seal, think again. It > is > part of the block and used for alignment of the pump shaft. > > Its a seal! > Nothing personal.. yes its for alignment, yes its a seal, it can be > removed. > Machining a flat surface with a ring in the middle is totally > impractical. > > Trust me on this one! > > Stan Wilder |
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