Re: 1963 Sportwin O-Ring on Upper Crank Bearing?

Home Forum Ask A Member 1963 Sportwin O-Ring on Upper Crank Bearing? Re: 1963 Sportwin O-Ring on Upper Crank Bearing?


fleetwin

US Member - 2 Years
Replies: 4737
Topics: 46
#68932

OK, yes, I see the notch in the front half of the crankcase, so no oring is used….Please check the vacuum/recirc passages carefully, or oil will back up into the mag plate. And yes, those locating pins must line up with/into the holes in the bearings, or parts will be crushed/distorted/damaged when the crankcase is reassembled. Those locating pins may or may not be lubricating holes, try passing a tiny wire/light through to check it out….
The hole in the upper front half of the crankcase is a vacuum port that draws residual oil down and out of the upper bearing area.
Getting back to your original question….You can see that adding the oring to the upper bearing would disable the vacuum port allowing excess oil to build up and spray into the mag plate….