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Old 04-11-2020, 03:20 PM   #1
LEM
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Default 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.
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Old 04-11-2020, 03:48 PM   #2
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Default Re: Pilot bearing fit

Yes it is a press fit and the outer part does not spin.
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Old 04-11-2020, 04:33 PM   #3
midgetracer
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Default 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.
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Old 04-11-2020, 04:37 PM   #4
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Default 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.
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Old 04-11-2020, 07:16 PM   #5
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Default Re: Pilot bearing fit

What Midgetracer and J said.
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Old 04-12-2020, 10:23 AM   #6
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Default Re: Pilot bearing fit

Bearing should be # 6203, 17mm ID, 40mm OD & 12mm wide.
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Old 04-12-2020, 11:42 AM   #7
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Default 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.
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Old 04-12-2020, 02:41 PM   #8
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Default Re: Pilot bearing fit

Well, thats a heck of a lot more than a press fit. What number is your bearing ?
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Old 04-12-2020, 03:00 PM   #9
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Default 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.

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Old 04-12-2020, 03:05 PM   #10
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Default Re: Pilot bearing fit

The bearing is A7600 per the package it came in.
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Old 04-12-2020, 04:01 PM   #11
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Default Re: Pilot bearing fit

Something is not right... The A7600 bearing is a common bearing in Fords up to the 60's and beyond. ID .667. As someone asked, what is the shaft out of?

As an alternative you could use the bronze replacement bushing and ream it out to fit? https://www.macsautoparts.com/ford_m...for-a7600.html
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Old 04-13-2020, 12:39 AM   #12
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Default 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.
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Old 04-13-2020, 12:46 AM   #13
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Default Re: Pilot bearing fit

Make sure the rest of the part is correct before modifying it.
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Old 04-13-2020, 10:28 AM   #14
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Default 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.
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Old 04-13-2020, 04:03 PM   #15
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Default Re: Pilot bearing fit

Quote:
Originally Posted by LEM View Post
Does anyone have an idea what the transmission input shaft diameter should be?
My shaft is .696 diameter and my bearing is .667 ID.
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.
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Old 04-13-2020, 04:39 PM   #16
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Default Re: Pilot bearing fit

Anew bearing has an id of .670 Trans input shaft should be between .667 to .669
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Old 04-14-2020, 10:57 AM   #17
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Default Re: Pilot bearing fit

Quote:
Originally Posted by katy View Post
Bearing should be # 6203, 17mm ID, 40mm OD & 12mm wide.
17mm = .669"
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Old 04-14-2020, 12:10 PM   #18
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Default Re: Pilot bearing fit

Quote:
Originally Posted by goodcar View Post
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.
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.
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Old 04-14-2020, 12:59 PM   #19
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Default Re: Pilot bearing fit

Quote:
Originally Posted by Russ/40 View Post
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.
I didn't purchase a new input shaft from Brattons. I merely posted the description exactly as it appears in their catalog.
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Old 04-14-2020, 01:23 PM   #20
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Default Re: Pilot bearing fit

Quote:
Originally Posted by goodcar View Post
I didn't purchase a new input shaft from Brattons. I merely posted the description exactly as it appears in their catalog.
Have you decided what your going to do?

Where are you located?
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