Transmission Ball Cap Ball Bearing Type

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Model T Ford Forum: Forum 2016: Transmission Ball Cap Ball Bearing Type
Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Thomas - Centerville, Iowa on Sunday, March 27, 2016 - 07:41 pm:

Searched the threads and found lots of discussions about oil clearances, but not a firm opinion about the ball bearing type of cap.

Anyone use the ball bearing cap rather than the babbit original? I know it is a lot more expensive, but is it a better solution?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Sunday, March 27, 2016 - 07:44 pm:

Just my opinion- waste of money. The original works fine. No advantage for the more expensive part.


Top of pagePrevious messageNext messageBottom of page Link to this message  By joe bell on Sunday, March 27, 2016 - 09:10 pm:

I have had two engines with broken cranks and ball bearing fourth mains?? Some say the ball bearing fourth does not allow the trans to expand as it heats up so it pushes forward into the magneto and takes the rear main out? Just some thoughts for you.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Les Schubert on Sunday, March 27, 2016 - 10:37 pm:

I've run them for years and countless thousands of miles. Of course I build my own. The ones I make are locked to the output shaft but can slip in the housing. Historically I have made sure the shaft runs true prior to installing the bearing. Now I also utilize my "floating transmission shaft"


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jay - In Northern California on Sunday, March 27, 2016 - 10:58 pm:

Here's the link to the past thread on Les's
"floating transmission shaft".

"http://www.mtfca.com/discus/messages/118802/125070.html?1266623997


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jay - In Northern California on Sunday, March 27, 2016 - 11:25 pm:

Here's another past thread on the floating transmission shaft.

http://www.mtfca.com/discus/messages/179374/192159.html?1298216538


Top of pagePrevious messageNext messageBottom of page Link to this message  By Les VonNordheim on Monday, March 28, 2016 - 12:27 am:

I also have been running one for approx. 10 years. The sealed ball bearing can slip on the out put shaft. Prior to installing a ball bearing 4th main, I made sure the shaft runs true. I'm still running an early crank shaft.
I have a re-built short block with SCAT crank that will be replacing the current engine in my 13 touring.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Patrick on Monday, March 28, 2016 - 08:08 am:

The all important fourth bearing is not only there to align the rear of the transmission and to allow a lubricated enclosure in which the shaft turns, but it also provides support for the massive weight of the rear of the transmission. A roller bearing can do the first two but I don't think was designed to do the third. When I was considering using a fourth main roller bearing in 2010, I was talked out of it by many on this forum and elected to have the original babbited ball cap repoured by George King III of Engine Restoration of Connecticutt and fit to the machined shaft of the drive plate which I sent along with the ball cap. Also, the requirement for using the roller bearing that I cut 3/8" from the ball helped to seal my decision against using the roller bearing and opting for the babbited one. Jim Patrick


Top of pagePrevious messageNext messageBottom of page Link to this message  By J and M Machine Co Inc on Monday, March 28, 2016 - 08:57 am:

We install them on every engine we rebuild since the drive plate shaft is always worn. We've never had a problem with them. We purchase them from Kohnke Machine. Herm uses the original bell so there's no modification to the torque tube.


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