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11-15-2018, 11:09 PM | #1 |
Senior Member
Join Date: Apr 2011
Location: Endeavor, WI
Posts: 119
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Main Shaft in Trans is worn...
Hello!
So, I started taking my transmission apart and the main shaft seems to be worn. Where it slides into the Main Drive Gear it is worn around the edge of the roller bearing (see next to tip of screw-driver in picture). The Main Drive Gear also rocks all around in it's ball bearing (see video). My questions for the pros out there are: 1) Is the small 'lip' on the Main Shaft supposed to be there and it is just the roller bearing that is bad? (I got new bearings that I am going to test fit on the shaft when I get it out. 2) Since I don't have the shaft out yet, any theories as to why the shaft rocks so much before disassembly??
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"I have not yet begun to defile myself." -Doc Holliday '31 Tudor, '69 F100, '66 Mustang, '11 Ford Flex Last edited by braol; 11-16-2018 at 10:17 PM. Reason: add picture |
11-16-2018, 08:27 AM | #2 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Main Shaft in Trans is worn...
The front shaft is held in a straight line by the crankshaft bearing and front tranny case bearing. The output shaft is held in a straight line by the pocket bearing and rear tranny case bearing. Depending on the time period, the output shaft has a built in lip, or a separate spacer for the pocket bearing (transmission main shaft pilot bearing).
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11-16-2018, 10:20 PM | #3 |
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Join Date: Apr 2011
Location: Endeavor, WI
Posts: 119
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Re: Main Shaft in Trans is worn...
Turns out that my ball bearings were installed with the open faces facing OUT of the transmission!
I just can't seem to download any pictures...
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"I have not yet begun to defile myself." -Doc Holliday '31 Tudor, '69 F100, '66 Mustang, '11 Ford Flex Last edited by braol; 11-16-2018 at 10:34 PM. |
11-16-2018, 10:37 PM | #4 |
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Join Date: May 2010
Location: Oregon
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Re: Main Shaft in Trans is worn...
QUOTE: The Main Drive Gear also rocks all around in it's ball bearing (see video).
I cannot see your video. However, the situation described is normal for a ball bearing supported assembly and should be less pronounced with a new bearing. |
11-17-2018, 10:27 AM | #5 | |
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Join Date: Jun 2015
Location: Red Deer, Alberta
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Re: Main Shaft in Trans is worn...
Quote:
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If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! Last edited by katy; 11-17-2018 at 10:28 AM. Reason: Addition |
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11-17-2018, 11:09 AM | #6 |
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Join Date: May 2010
Posts: 1,835
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Re: Main Shaft in Trans is worn...
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"Never complain,never explain"... Henry Ford II |
12-06-2018, 01:34 PM | #7 |
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Join Date: Apr 2011
Location: Endeavor, WI
Posts: 119
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Re: Main Shaft in Trans is worn...
All put together now. New main shaft from Brattons was overspec and my gears wouldn't slide on. I am sending it back for a refund.
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"I have not yet begun to defile myself." -Doc Holliday '31 Tudor, '69 F100, '66 Mustang, '11 Ford Flex |
12-06-2018, 03:30 PM | #8 |
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Join Date: Nov 2010
Location: Sedro-Woolley, WA
Posts: 1,023
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Re: Main Shaft in Trans is worn...
I had the same problem when I bought the transmission rebuild package for my '31 CCPU. Their new main shaft was too big for their 2nd /3rd gear slider. I ended up using my old main shaft and everything worked out fine.
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12-06-2018, 02:44 PM | #9 |
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Join Date: May 2010
Location: Southern California
Posts: 3,131
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Re: Main Shaft in Trans is worn...
The link below will take you to a pictorial document about the overhaul of a Model A transmission. It is long and tedious, 73 pages. On page 30 it addresses the question about the main shaft. Keep in mind there are two different shafts. The early shaft has a bearing spacer that is integral to the shaft. The late shaft has a removable spacer that is shaped like a key ring. It is prudent to replace it at each overhaul as they are usually worn flat on the front surface.
https://www.santaanitaas.org/wp-cont...ugust-2018.pdf Tom Endy |
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