(27-11-2018, 07:25 PM)Bob Culver Wrote: Unless finished in place all shells are made with an exaggerated clearance at the parting line although it may not be obvious.
Bob, surely you mean interference? (or 'crush' as it's known in the trade). The shells stand a few thou proud of their housing so they are forced firmly into it on assembly. It is this radial force (not the tabs) which prevents the bearing shells turning in service. I have read write-ups ascribing this to 'wear' of the housing and advocating shimming it out, I submit that's not a great idea.