Pilot bearing fit
 

Is the pilot bearing to the transmission input shaft Press fit? My brand new pilot bearing ID to Transmission input shaft seems to be a very tight press fit.

Re: Pilot bearing fit
 

Yes it is a press fit and the outer part does not spin.

Re: Pilot bearing fit
 

The pilot bearing is a press fit to the flywheel, but not a press fit to the input shaft of the transmission. If it was you would not be able to install the transmission.

Re: Pilot bearing fit
 

Check the dimensions to see which part is wrong. Are you sure there are no burrs anywhere? it should be a slip fit on the transmission.

Re: Pilot bearing fit
 

What Midgetracer and J said.

Re: Pilot bearing fit
 

Bearing should be # 6203, 17mm ID, 40mm OD & 12mm wide.

Re: Pilot bearing fit
 

Does anyone have an idea what the transmission input shaft diameter should be?
My shaft is .696 diameter and my bearing is .667 ID.

Re: Pilot bearing fit
 

Well, thats a heck of a lot more than a press fit. What number is your bearing ?

Re: Pilot bearing fit
 

Go find a bearing that fits. That was a very common one used on many makes and models of vehicles. My model A my tractor and a mustang I once owned had the same pilot bearing. How was the fit on the old bearing or did things get changed out? I went out and measured an A input shaft and see .6562. So what is your shaft out of? You apparently have the correct bearing for sure.

Re: Pilot bearing fit
 

The bearing is A7600 per the package it came in.

Re: Pilot bearing fit
 

Re: Pilot bearing fit
 

I would take some emery cloth and sand the shaft. According to your measurements, you need about.029” I had a new nors shaft that wouldn’t go, and that’s what I did to get it to fit. Didn’t take much time to do.

Re: Pilot bearing fit
 

Make sure the rest of the part is correct before modifying it.

Re: Pilot bearing fit
 

IMHO, .029" is an awful lot of sanding. My choice would be to first side by side compare you have a compatible input shaft; which your problem suggests you dont.
Assuming it will work, go with the bronze bushing and size it as necessary.

Re: Pilot bearing fit
 

Bratton's catalog description: TRANSMISSION MAIN DRIVE GEAR - U.S. made. The end of the shaft where the pilot bearing (11550) fits must be .668 diameter. If worn more then .002 (.666) then the shaft must be built up or replaced. A poor fit will cause the transmission to jump out of high gear. Will not fit Early 1928 transmission boxes.

Re: Pilot bearing fit
 

Anew bearing has an id of .670 Trans input shaft should be between .667 to .669

Re: Pilot bearing fit
 

17mm = .669"

Re: Pilot bearing fit
 

Is your input shaft a new purchase from Brattons, since you reference them? If not and its an older used input shaft, someone must have repaired it to fit a bearing they had on hand. Either get the bronze bushing and ream to size or get a machine shop to turn it down to the proper size.

Re: Pilot bearing fit
 

I didn't purchase a new input shaft from Brattons. I merely posted the description exactly as it appears in their catalog.

Re: Pilot bearing fit
 

Have you decided what your going to do?

Where are you located?