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Ford 9N, 2N & 8N Discussion Forum
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Ford 9N clutch shaft bushing orientation

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Abbby

03-23-2020 19:43:47




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1941 9N ford. I am replacing the two clutch shaft bushings in the bell housing. One on both sides that support the clutch shaft. I knocked the 2 out without paying attention to where the split line in the bearing or the hole goes. Anyone know the proper orientation of the hole/split in the bearing? Not really sure what the hole is for or if it matters.




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TheOldHokie

03-27-2020 08:07:10




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 Re: Specs in reply to Abbby, 03-23-2020 19:43:47  
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I'd go here:

[Url=https://www.shars.com/27-32-15-16-adjustable-blade-reamer]Size G adjustable reamer[/url]

I can loan you one if you dont want to buy. Probably cost $16 to ship both ways.

TOH



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Abbby

03-27-2020 07:32:46




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 Re: Specs in reply to Abbby, 03-23-2020 19:43:47  
What is the most economical method to ream this out after install?



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TheOldHokie

03-26-2020 21:09:18




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 Re: Specs in reply to Abbby, 03-23-2020 19:43:47  
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Tough to get an accurate measurement of a bore with calipers. Now you are down to roughly .010 Interference which is much more realistic especially given the soft bearing material.

Drive it in with a good fitting mandrel just as you did the first one - you may peel some material off the OD in the process. Then ream both to .876/.877 being careful to keep the bores colinear. Lots of people have done this - mine were done almost 20 years ago and it was straight forward.

TOH

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Abbby

03-26-2020 18:35:18




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 Specs in reply to Abbby, 03-23-2020 19:43:47  
So here is what I have with a Mitutoyo digital caliper

Bushing OD - .944

Housing ID - .93 (little tricky getting a good reading)

Bushing thickness - .038

Shaft OD .875

Part number of bushing 407508A

Add up the parts and not going into the .93 hole

Have to think many people have done this



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TheOldHokie

03-26-2020 13:09:46




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 Re: Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
Ooops - should be 7/8 not 5/8.

TOH



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TheOldHokie

03-26-2020 13:07:23




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 Re: Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
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Clutch shaft is .5/8", brake shaft is 1" which is reasonable but OD of both bushings is non standard and wall thickness is tissue thin. Given FORDs fondness for non-standard bushings that's also believable. But the OPs .925 bore measurement is way smaller than would be reasonable even for FORD and not so believable.

TOH



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Bob

03-26-2020 12:04:23




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 Re: Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
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'Somethings not adding up in this story.'

What's not adding up is that someone is confusing the clutch shaft and brake shaft dimensions.

Here's the official info from the FIAT site (brake shaft bushing, #12, and clutch shaft bushing. Shows clutch shaft bushing O.D. as 23.96MM, about (0.9433").



(Heck, I think I'm more confused now than before after converting the dimensions listed! :shock: )

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TheOldHokie

03-26-2020 10:22:10




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 Re: Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
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YT describes their part as 7/8" (.875) ID. If wall thickness is .062 (pretty dam' thin) the OD would be 1.00" on the button. Somethings not adding up in this story.

TOH



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Hobo,NC

03-26-2020 06:13:24




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 Re: Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
Whut part number are you using.



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TheOldHokie

03-25-2020 19:29:57




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 Re: Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
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If your measurements are right that is way too much interference - .005 would be on the high side and you measure 4X that. Are you SURE those measurements are accurate and what are you doing to correct for the split in the bearing? Based on the first bearing you are going to have to ream both after installation.

TOH



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Abbby

03-25-2020 18:59:00




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 Ford 9N clutch shaft bushing fit in reply to Abbby, 03-23-2020 19:43:47  
So I went to do what I thought was a simple task of driving the new bushings in. I had a close size bushing driver and it went in extremely harder then what I anticipated but got it done. Now the clutch shaft will not go in which I anticipated after the tight fit.. Measured the second bushing OD at .945 and the bore in the bell housing at .925. Houston there is a problem. Any advice on what others have done to work around this. Kind of wish I would have just left things as is but there was some slop in the old ones and I had the tractor split.

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TheOldHokie

03-25-2020 07:41:42




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 Re: Ford 9N clutch shaft bushing orientation in reply to Abbby, 03-23-2020 19:43:47  
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Me too :lol:
TOH



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TheOldHokie

03-25-2020 06:14:07




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 Re: Ford 9N clutch shaft bushing orientation in reply to Abbby, 03-23-2020 19:43:47  
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Nope - it's primarily an artifact of the manufacturing process. Cheap and fast to make from flat stock.

[Url=http://blog.cctybearing.com/wrapped-bushing-split-joints]Why is there a split in my bushing[/url]

TOH



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Bruce (VA)

03-25-2020 07:18:26




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 Re: Ford 9N clutch shaft bushing orientation in reply to TheOldHokie, 03-25-2020 06:14:07  
Yea, I know.

I was just trying to be a smart azz!

;)



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Bob

03-24-2020 11:57:15




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 Re: Ford 9N clutch shaft bushing orientation in reply to Abbby, 03-23-2020 19:43:47  
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Yep!



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Bruce (VA)

03-24-2020 05:03:04




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 Re: Ford 9N clutch shaft bushing orientation in reply to Abbby, 03-23-2020 19:43:47  
The purpose of the split in the bushing is to allow for it to collapse on itself while you're installing it w/o a bushing driver. ;)

Putting a small hose clamp around it will usually work if you don't have a bushing driver.



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TheOldHokie

03-24-2020 04:05:59




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 Re: Ford 9N clutch shaft bushing orientation in reply to Abbby, 03-23-2020 19:43:47  
Quoting Removed, click Modern View to see The bushings are generic and the hole is for lubrication. As best I remember the tractors do not have any provision for lubricating those bushings so in this application the hole can go anywhere. The split has no purpose and is an artifact of the manufacturing process (rolling).

TOH



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