So im putting together my new shortblock and swapping the old oil pump sprocket and new shaft into my new oil pump and im curious/confused on how the seal holds out the oill? It has an inner lip but it doesnt seal on the shaft because at that part its threaded and its smaller than the id of the seal..all i can see is hardly a lip on the outer part of the seal since it constantly spins against the back part of the sprocket...is this how it seals? I see the internal wavy lines inside the seal to hold out the oil but its not sealing against anything, and yes the shaft is in all the way and same on the old pump so im confused..how does this seal work to hold out the oil?

 

Anybody know what Im even talking about? ill put up a pic if I have to, basically tho how does the seal hold out the oil?

 

No one knows huh?

 

the way the seal works is basically riding on that outer section of the oil pump sprocket , If you notice the seal points inwards. As pressure increase and volume increases, it pushes on inside bevelled edge of the inside edge of the trailing ( ride section). The higher the volume, the higher the force exerted on that seal, which then makes it "seal"