On the AC/Simplicity BGB, the seal butts against the ball bearing.
The shims and side plate hold it all in place.
That seal is unavailable in it's original form, (double cased), and
almost 1/2" thick.
Timken and National makes one that will seal, but is a single case,
and is only 1/4" thick. (Part # 471733) ($6.00)
There must be some sort of substantial spacer behind the seal that
contacts the ball bearing's outter ring to hold it in the bore.
My solution was to carefully tear the old seal apart and reuse the
old seal's inner casing, inserting it into the new seal.
This still is not thick enough, but it will hold the bearing in place
and seal the shaft properly. Additional shims are needed to make up
the necessary thickness, and the side plate holds everything tight.
The pictures shows an aproximate 3/16" slot cut into the old inner case.
This allows the inner case to be compressed to fit inside the new seal.
Edited by justwalt, November 06, 2010 - 12:22 PM.