996 Transmission Rebuild and Pinion Bearing Replacement DIY
#76
I see.
I suspect that Chinese bearing company has some sort of an internet spider to scour part #s just to create web pages offering them. Even if the Chinese would make that bearing, I can't imagine too many people here would want to be guinea pigs for it.
The proper Schaeffler/*** bearing is OEM. I got that info right from the company that makes the bearings for them. It's going to be a Porsche only bearing until Porsche relinquishes control of it or someone reverse engineers it as I can't imagine Porsche or *** are going to give specifications for it which isn't simple as there is a lot more to a bearing than boundary dimensions.
I don't see readily accessible substitutes working for it either without modification and best guesses.
These links were shortened so I can't read them. I'm curious to read about these being used as axle bearings.
I suspect that Chinese bearing company has some sort of an internet spider to scour part #s just to create web pages offering them. Even if the Chinese would make that bearing, I can't imagine too many people here would want to be guinea pigs for it.
The proper Schaeffler/*** bearing is OEM. I got that info right from the company that makes the bearings for them. It's going to be a Porsche only bearing until Porsche relinquishes control of it or someone reverse engineers it as I can't imagine Porsche or *** are going to give specifications for it which isn't simple as there is a lot more to a bearing than boundary dimensions.
I don't see readily accessible substitutes working for it either without modification and best guesses.
"Here is some info on the bearing part numbers you mentioned:
A finders fee offered !
It is an *** Volvo or Mercedes truck axle bearing ?
https://rennlist.com/forums/996-foru...-bearings.html
http://forums.pelicanparts.com/porsc...-bearings.html
These come up as 964 /993 bearings?
Hopefully others are better than me at hunting for you. "
A finders fee offered !
It is an *** Volvo or Mercedes truck axle bearing ?
https://rennlist.com/forums/996-foru...-bearings.html
http://forums.pelicanparts.com/porsc...-bearings.html
These come up as 964 /993 bearings?
Hopefully others are better than me at hunting for you. "
#77
Rennlist Member
I see.
I suspect that Chinese bearing company has some sort of an internet spider to scour part #s just to create web pages offering them. Even if the Chinese would make that bearing, I can't imagine too many people here would want to be guinea pigs for it.
The proper Schaeffler/*** bearing is OEM. I got that info right from the company that makes the bearings for them. It's going to be a Porsche only bearing until Porsche relinquishes control of it or someone reverse engineers it as I can't imagine Porsche or *** are going to give specifications for it which isn't simple as there is a lot more to a bearing than boundary dimensions.
I don't see readily accessible substitutes working for it either without modification and best guesses.
These links were shortened so I can't read them. I'm curious to read about these being used as axle bearings.
I suspect that Chinese bearing company has some sort of an internet spider to scour part #s just to create web pages offering them. Even if the Chinese would make that bearing, I can't imagine too many people here would want to be guinea pigs for it.
The proper Schaeffler/*** bearing is OEM. I got that info right from the company that makes the bearings for them. It's going to be a Porsche only bearing until Porsche relinquishes control of it or someone reverse engineers it as I can't imagine Porsche or *** are going to give specifications for it which isn't simple as there is a lot more to a bearing than boundary dimensions.
I don't see readily accessible substitutes working for it either without modification and best guesses.
These links were shortened so I can't read them. I'm curious to read about these being used as axle bearings.
The chinese bearings are the wheel bearing design (split inner race) that are very plentifull and have been around for a long time. I have no idea why the Porsche bearings have the same identification number as the wheel bearings except that they are dimensionaly the same, but the differences make them non-interchangeable.
Last edited by Porschetech3; 03-03-2017 at 12:15 AM. Reason: more info
#79
Rennlist Member
I just had a revelation that could result in a interchangeable bearing solution for the upper input bearing. The upper input bearing part number 99630280700 does not have the "notch" in the outer race like the lower pinion bearing 99630280800 does, so the only other caveat is the split outer race. A pair of single row angular universally matched or precision matched (DF-X) for preload, mounted in the" X" configuration ie. face-to-face (instead of back-to-back like a wheel bearing in the "O" configuration ) would be a suitable solution. Just decide if you want them sealed or open. Spud72 should call his contact at *** and see what a pair of universally matched 7207 or 6207 35x72x17 bearings could be priced at.
Last edited by Porschetech3; 03-04-2017 at 07:58 PM.
#80
Addict
Rennlist Member
Rennlist Member
We already studied that solution but unfortunately it came a few dollars away from the price of OEM bearing so I decided that I would'nt risk the success of the rebuild only for a few bucks.
#81
Rennlist Member
#82
I just had a revelation that could result in a interchangeable bearing solution for the upper input bearing. The upper input bearing part number 99630280700 does not have the "notch" in the outer race like the lower pinion bearing 99630280800 does, so the only other caveat is the split outer race. A pair of single row angular universally matched or precision matched (DF-X) for preload, mounted in the" X" configuration ie. face-to-face (instead of back-to-back like a wheel bearing in the "O" configuration ) would be a suitable solution. Just decide if you want them sealed or open. Spud72 should call his contact at *** and see what a pair of universally matched 7207 or 6207 35x72x17 bearings could be priced at.
If you can't get the right bearings, don't make do. It would be different if their certainly not available anymore and have to make something work, but it's not worth it at this point in my opinion.
#83
Rennlist Member
It's not that simple. Angular contacts have specific contact angles and without knowing how that the OEM bearing is built as I would certainly not recommend a simple pair of 7207 in their place.... and certainly not conrad 6xxx deep groove bearings.
If you can't get the right bearings, don't make do. It would be different if their certainly not available anymore and have to make something work, but it's not worth it at this point in my opinion.
If you can't get the right bearings, don't make do. It would be different if their certainly not available anymore and have to make something work, but it's not worth it at this point in my opinion.
I would never suggest making do, A pair of quality 7207 with matched preload and Identical contact angle ( usually 30 degrees or 40 degrees on manual trans thrust bearing) would be a viable alternative. I would use it in my personal car IF there were substantial savings. I probably would not use it in a customer car .
Last edited by Porschetech3; 03-04-2017 at 11:08 PM.
#85
Furthermore, it is giving up on the sealed aspect of the bearing which I assume is something you're willing to do but if not a sealed angular contact like that is not a common critter. Is that a problem for this? I don't know.
Either way, it's sort of an intellectual exercise more than anything at this point considering the proper ones are still available.
#86
Drifting
Removing the seal on the bearing
A very talented Forum member (now works for Singer)who worked on this issue some years ago removed the seals and some later Posts indicate the same strategy.
The conclusion was that it was worth the risk. The underlying assumption was that the unsealed bearings would last longer than the usual 80k+ miles for the factory-greased and sealed version. Who knows?
A very talented Forum member (now works for Singer)who worked on this issue some years ago removed the seals and some later Posts indicate the same strategy.
The conclusion was that it was worth the risk. The underlying assumption was that the unsealed bearings would last longer than the usual 80k+ miles for the factory-greased and sealed version. Who knows?
#87
Hey guys. Great thread! Thanks Nick.
I have a -99 996 C2 which has a whining manual transmission 199000kms driven.
All the symptoms match to a broken pinion bearing.
I did some digging and found out that Audi uses pinion bearing with same measurements and even split outer race as Porsche. I do not know if it has a notch for the shim though... Does anyone have a picture of that notch in Porsche bearing?
Number 4 in the picture: http://audi.7zap.com/en/rdw/audi+a6+.../3/311-311070/
Audi part code: 0a3 311 133
Price for that bearing here in Finland is around 140€uros.
This might be worth checking out!
I have a -99 996 C2 which has a whining manual transmission 199000kms driven.
All the symptoms match to a broken pinion bearing.
I did some digging and found out that Audi uses pinion bearing with same measurements and even split outer race as Porsche. I do not know if it has a notch for the shim though... Does anyone have a picture of that notch in Porsche bearing?
Number 4 in the picture: http://audi.7zap.com/en/rdw/audi+a6+.../3/311-311070/
Audi part code: 0a3 311 133
Price for that bearing here in Finland is around 140€uros.
This might be worth checking out!
Last edited by Coltti; 04-02-2017 at 06:52 PM.
#88
Addict
Rennlist Member
Rennlist Member
Check my thread : https://rennlist.com/forums/996-foru...nt-my-diy.html
You will find photos of the pinion bearing
You will find photos of the pinion bearing
#89
Hey guys. Great thread! Thanks Nick.
I have a -99 996 C2 which has a whining manual transmission 199000kms driven.
All the symptoms match to a broken pinion bearing.
I did some digging and found out that Audi uses pinion bearing with same measurements and even split outer race as Porsche. I do not know if it has a notch for the shim though... Does anyone have a picture of that notch in Porsche bearing?
Number 4 in the picture: http://audi.7zap.com/en/rdw/audi+a6+.../3/311-311070/
Audi part code: 0a3 311 133
Price for that bearing here in Finland is around 140€uros.
This might be worth checking out!
I have a -99 996 C2 which has a whining manual transmission 199000kms driven.
All the symptoms match to a broken pinion bearing.
I did some digging and found out that Audi uses pinion bearing with same measurements and even split outer race as Porsche. I do not know if it has a notch for the shim though... Does anyone have a picture of that notch in Porsche bearing?
Number 4 in the picture: http://audi.7zap.com/en/rdw/audi+a6+.../3/311-311070/
Audi part code: 0a3 311 133
Price for that bearing here in Finland is around 140€uros.
This might be worth checking out!
https://www.ecstuning.com/b-genuine-...ing/0a3311133/