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 Post subject: Torque tube rebuild
PostPosted: Sun Jun 19, 2022 10:17 pm 
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I'm part way through more restoration work on the turbo and as I now have the torque tube removed so I can tackle the RMS, I'm considering if I should get the torque tube rebuilt?

I've spun the torque shaft by hand and there does not appear to be any play or grinding but there is some noise (kind of like a skateboard wheel when spun). Could this be indicative of dry bearings? Is this normal or are rebuilt torque tubes totally silent?

Next question is if I did rebuild I've heard the C5 bearings that Porsche originally used are not available and that C4 should be used. I've also seen the super bearings from the US but they are pretty expensive! Possibly £1000 after taxes and customs duty for a set of 4....

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 Post subject: Re: Torque tube rebuild
PostPosted: Mon Jun 20, 2022 8:32 pm 
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I would think that they should be almost silent, any kind of dry rumble suggests trouble ahead

I have a bearing number somewhere I will look it up

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 Post subject: Re: Torque tube rebuild
PostPosted: Wed Jun 22, 2022 9:57 pm 
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I finally completely dropped the torque tube down earlier and recorded the noise, I can see the grease has come out of the bearings as well and the sound dry. Transmission end sounds the worse, maybe because of the additional weight of the coupler on the shaft?

I've contacted Augment Automotive and they are able to rebuild my existing torque tube with FAG C3 rated bearings (I believe the original were C5 and rated for high temperature). I've done some searching and can only find C3 off the shelf, some NOS C4 by INA on ebay and a reference to requesting C5 bearings which were C3 bearings that were re-worked by the supplier (SKF) to C5 tolerance.

There are also Constantine's Super Bearings from the US but after shipping and customs that would be the best part of £1000 in parts alone :shock:





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 Post subject: Re: Torque tube rebuild
PostPosted: Wed Jun 22, 2022 11:51 pm 
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Ouch, that’s a lot of money for some bearings

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 Post subject: Re: Torque tube rebuild
PostPosted: Thu Jun 23, 2022 9:07 am 
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Waylander wrote:
Ouch, that’s a lot of money for some bearings


Yes indeed!

http://www.blackseard.com/site/index.ph ... s&Itemid=3

$780 +shipping

£640 at current exchange rate

£768 +20% VAT

£798.72 + 4% duty

£806.72 + £8 Royal Mail Handling Charge

Postage could be expensive as well and not included.

I exaggerated slightly but still not cheap! the super bearings do come with new heavy duty bearing carriers though and are claimed to be suitable for v8 swaps and high power custom turbo engines etc...

Design 911 have some 9products bearings which come with a bearing carrier as well which is slightly different to the super bearings and about half the price -
https://www.design911.co.uk/fu/prod1470 ... =doofinder
£440inc VAT


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 Post subject: Re: Torque tube rebuild
PostPosted: Thu Jun 23, 2022 10:04 am 
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Done a couple of rebuilds of t/t , it’s not that difficult . From memory 4x bearings were £30 and £20 to powder coat t/t . There’s a few guides online to follow .
I got mine from Wych Bearings 4x FAG 6006-2Z-C3 if that’s any help .


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 Post subject: Re: Torque tube rebuild
PostPosted: Thu Jun 23, 2022 11:44 am 
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sgl1966 wrote:
Done a couple of rebuilds of t/t , it’s not that difficult . From memory 4x bearings were £30 and £20 to powder coat t/t . There’s a few guides online to follow .
I got mine from Wych Bearings 4x FAG 6006-2Z-C3 if that’s any help .


Cheers sgl :) those are the only ones available as far as I'm aware (searching both SKF and FAGs online database.

What method did you use to replace them and what condition were your bearing carriers in when you removed them?

Augment offer a full rebuild including painting for just under £500


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 Post subject: Re: Torque tube rebuild
PostPosted: Thu Jun 23, 2022 8:54 pm 
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Removal I used 1/2 galvanised tube over spigot bearing end of driveshaft to protect it and a few heavy hits with a lump hammer then a 3" round post and a few heavy hits with a sledge to remove carriers after lubricating tube .
Installing I used the threaded bar method after using soapy water to lubricate tube again .
The carriers have all been reusable but I did have my local engineer pin the bearings in the carriers as I wanted to make sure this was done correctly .


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 Post subject: Re: Torque tube rebuild
PostPosted: Fri Jun 24, 2022 2:53 pm 
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Joined: Sat May 28, 2011 10:17 pm
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Location: Worcestershire
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sgl1966 wrote:
Removal I used 1/2 galvanised tube over spigot bearing end of driveshaft to protect it and a few heavy hits with a lump hammer then a 3" round post and a few heavy hits with a sledge to remove carriers after lubricating tube .
Installing I used the threaded bar method after using soapy water to lubricate tube again .
The carriers have all been reusable but I did have my local engineer pin the bearings in the carriers as I wanted to make sure this was done correctly .


Thanks - I think I will do it myself then, I was trying to save time by farming jobs out but there is potential to save a few £££ keeping this job in-house :alien:

Just look at getting a 6ft length of 1/2" steel pipe :D


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