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Pitting on A833 input shaft
#2483198
04/15/18 06:14 PM
04/15/18 06:14 PM
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Joined: Sep 2003
Posts: 815 PNW
Danan
OP
super stock
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OP
super stock
Joined: Sep 2003
Posts: 815
PNW
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Hello,
I have some 4 spd transmissions that need to be rebuilt. They've been sitting around for years and have a little surface rust on the input shafts. The rust is quickly and easily removed with a wire wheel but there is very light pitting left behind.
I don't have a good way of posting a picture, but can anyone give me an idea of how much pitting is too much? Or, said another way, is there even such a thing as an acceptable amount of pitting?
Also, which is better able to accommodate input shaft flaws: a pilot bushing or a pilot bearing (the MP bearing that seats in the crank register)?
I understand that this is a bit nebulous, so thanks in advance for any input.
Last edited by Danan; 04/16/18 12:47 AM.
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Re: Pitting on A833 input shaft
[Re: Danan]
#2483211
04/15/18 06:49 PM
04/15/18 06:49 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I've run lots of pitted gears and such. I'm more concerned with high spots than low spots.
I always run a bushing and not a bearing.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Pitting on A833 input shaft
[Re: poorboy]
#2484502
04/18/18 09:02 AM
04/18/18 09:02 AM
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Joined: Sep 2003
Posts: 815 PNW
Danan
OP
super stock
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OP
super stock
Joined: Sep 2003
Posts: 815
PNW
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The area of pitting I was concerned about is at the end of the input shaft where the bushing rides.
I've already wire wheeled the surface rust and polished with wet/dry sandpaper. So long as the pilot bushing/bearing doesn't require a perfect polished surface, i think I'm in good shape.
Thanks for the input!
Last edited by Danan; 04/18/18 09:03 AM.
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Re: Pitting on A833 input shaft
[Re: Danan]
#2485144
04/19/18 03:58 PM
04/19/18 03:58 PM
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Joined: Dec 2003
Posts: 10,938 Spokane Valley, WA
Big Bad Bee
I Live Here
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I Live Here
Joined: Dec 2003
Posts: 10,938
Spokane Valley, WA
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I'll probably get slammed for saying this, but the pits will probably help lubricate the mating surfaces by pocketing material. I have an old friend who is a racing engine builder. Owned a big shop that turned cranks for big machinery. Said the same thing about crank shaft bearing surfaces.
I’m listening.
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