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04-11-2020, 03:20 PM | #1 |
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Location: Everett, Wa
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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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04-11-2020, 03:48 PM | #2 |
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Location: Western Springs, IL
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Re: Pilot bearing fit
Yes it is a press fit and the outer part does not spin.
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04-11-2020, 04:33 PM | #3 |
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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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04-11-2020, 04:37 PM | #4 |
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Location: Oregon
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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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04-11-2020, 07:16 PM | #5 |
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Re: Pilot bearing fit
What Midgetracer and J said.
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04-12-2020, 10:23 AM | #6 |
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Re: Pilot bearing fit
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04-12-2020, 11:42 AM | #7 |
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Location: Everett, Wa
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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. |
04-12-2020, 02:41 PM | #8 |
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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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04-12-2020, 03:00 PM | #9 |
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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.
Last edited by J Franklin; 04-12-2020 at 05:15 PM. |
04-12-2020, 03:05 PM | #10 |
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Location: Everett, Wa
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Re: Pilot bearing fit
The bearing is A7600 per the package it came in.
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04-12-2020, 04:01 PM | #11 |
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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 |
04-13-2020, 12:39 AM | #12 |
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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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04-13-2020, 12:46 AM | #13 |
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Re: Pilot bearing fit
Make sure the rest of the part is correct before modifying it.
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04-13-2020, 10:28 AM | #14 |
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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. |
04-13-2020, 04:03 PM | #15 |
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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.
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04-13-2020, 04:39 PM | #16 |
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Re: Pilot bearing fit
Anew bearing has an id of .670 Trans input shaft should be between .667 to .669
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04-14-2020, 10:57 AM | #17 |
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Re: Pilot bearing fit
17mm = .669"
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04-14-2020, 12:10 PM | #18 | |
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Re: Pilot bearing fit
Quote:
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04-14-2020, 12:59 PM | #19 | |
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Re: Pilot bearing fit
Quote:
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04-14-2020, 01:23 PM | #20 |
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Re: Pilot bearing fit
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