An unpleasant surprise in my Pratt & Whitney 12C

[Hopefuldave]

Have drawings I made to adapt Timkens - though only a fair chance of even them being available in precision class. I'll see if I can get them scanned and posted here. If you want to poke around about their availability they are Timken 47490
For what its worth - the seven drawings?

I had to adapt taper rollers for my Holbrook Model C, the QCGB originally had 1985/1986/1922B - the B is flanged and long-obsolete! I was offered the set as special-order for £500 per bearing, minimum order quantity 500... so I put a circlip groove in the outer diameter of standard 1922 outers, Horn grooving tool and nice glowing curls coming off, but they fit and worked!

Dave H. (the other one)

 

[Peroni]

Well fate has intervened and new spindle bearings have been located. A firm in the UK had the middle bearing as NOS For $150. An obsolete bearing distributor in the US has the front one - supposedly the last know one in inventory - but they want $1600. Scheerer bearing in PA had brand new ones they made last summer in stock and ready to ship for about $900ea. So I have one NOS and one brand new bearing on the way. Much better than the $2600 I was quoted, which I expect were the Scheerer bearings with a huge markup by the distributor.

I did find several precision angular contact bearings that could be made to fit but even old stock were between $800 to $1000 per pair and two pairs would be required plus time and materials to make a flanged adapter cup.