Transmission Bushings

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Model T Ford Forum: Forum 2012: Transmission Bushings
Top of pagePrevious messageNext messageBottom of page Link to this message  By Pat Penrod on Tuesday, August 28, 2012 - 05:17 pm:

Im getting ready to tear down my tranny this winter to replace the driven plate that has elongated holes for the clutch pins. While I'm in there I was planning on replacing the bushings and freshening it up since I can actually feel the play in the reverse and low drum. I have the ability to machine my own bushings out of oil-lite. Has anyone else tried oi-lite bushings in their tranny instead of the standard bronze bushings? I would think they would be better, but not sure.


Top of pagePrevious messageNext messageBottom of page Link to this message  By R.V. Anderson on Tuesday, August 28, 2012 - 06:37 pm:

Oillite is made from sintered bronze and makes a nice light duty bearing but I wouldn't use them in a transmission. I don't think they'd stand up for long. They're a lot of work to replace.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Kohnke Rebabbitting on Tuesday, August 28, 2012 - 07:13 pm:

R.V.'s right, a few years ago, they were made of oil lite, but not for long, as the bushings disintegrated in just a few miles,the triple gears went first, Many Pieces!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Huson, Berthoud, Co. on Tuesday, August 28, 2012 - 07:35 pm:

Pat Penrod:

Why do you want to change the bushings?

trani


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew David Maiers on Tuesday, August 28, 2012 - 08:17 pm:

from what i understand 660 bronze is one of the best bearing materials around.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Kopsky, Lytle TX on Tuesday, August 28, 2012 - 08:26 pm:

Best for what? Why aren't you using it in your main bearings then? :-)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Pat Penrod on Tuesday, August 28, 2012 - 09:11 pm:

Dave, when I press on the reverse or low pedal with the inspection cover off I can see the drums move. Its MUCH more than .005,


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew David Maiers on Tuesday, August 28, 2012 - 09:34 pm:

the only reason its not used in main bearings is because it lacks embedability.

in modern engines the bearings are steel, bronze, and then babbitt, the babbitt layer is only about .0005 thick, so once the engine wears its running mostly on the bronze bearing surface.

if you were to supply clean constant oil pressure to the bearings and both surfaces were polished, you could run straight on cast iron. however bearings such as this have to be set up near perfect and are not very forgiving thusly we use multi layer bearings, or float shaft on a pillow, like grade 2 babbitt.

in the early 30s south bend machine co. used cast iron bearings in their low end lathes, they found that the bearings lasted nearly forever, and many of them are still in service today.


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