Reply To: Crankshaft Roll Pins

[frankr]

So simple.  The gasket and plate provide a flat surface on the crankcase.  If installed correctly, you would glue the gasket to the plate with a bit of sealer.  Everything below that comprises the seal which rotates on the plate’s surface.  Yes, everything rotates with the shaft except for the plate which stands still.  A thin film of oil lubricates the sliding surfaces.

There are only two ways fluid can get past that plate–around the outside, which is blocked by the gasket, or through the center hole which is blocked by the drive shaft, carbon seal, and o-ring.

Yes, the roll pin holds the whole assembly up against the plate.