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Torque tube rebuild

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dlknight
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dlknight PCGB Member
2022/06/19 22:17:14 (permalink)

Torque tube rebuild

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....
 


Current
1990 Panther Black 944 Turbo
2000 Violet Blue 911 Carrera 2
Gone
1987 Alpine White 944S with ProMAX Performance Chip
'88 Black 944 2.5, '96 Pug 306 XSI, '72 VW Type 2 Dormobile

4 Replies

Kongsodoken
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Kongsodoken Guest of the Club
Re: Torque tube rebuild 2022/06/22 20:03:46 (permalink)
Been a long time since I rebuilt mine 
I used the super bearings they are expensive but very good quality you only 3 off them not 4
I went this route purely because I wanted to ensure the shaft wasn’t rotating in the bearing as I had heard some reports about the bearing insert wearing the shaft  
I do remember it being a very satisfying job to do for a non mechanic like me 
 

1991 Improved 944 turbo
Eldavo
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Eldavo PCGB Member
Re: Torque tube rebuild 2022/06/22 21:56:07 (permalink)

Current:
1988 944 Turbo S (not exactly standard)
Past:
2002 996 3.6 C2
2006 987 Boxster 2.7
1988 944 2.7
dlknight
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dlknight PCGB Member
Re: Torque tube rebuild 2022/06/23 11:57:38 (permalink)
Thanks both - off the shelf bearings appear to be the 6006 2Z (or ZZ) C3 ones from SKF or FAG (reusing existing bearing carriers) - less than £10 each
 
Augment have a more expensive kit for late model 944s for some reason (approx £70).
 
If it isn't too difficult I may give it a go myself if it saves a few hundred pounds which can be spent on other parts!
 
@kongsodoken - did you use the threaded bar method to remove and install the bearings?

Current
1990 Panther Black 944 Turbo
2000 Violet Blue 911 Carrera 2
Gone
1987 Alpine White 944S with ProMAX Performance Chip
'88 Black 944 2.5, '96 Pug 306 XSI, '72 VW Type 2 Dormobile
Kongsodoken
Guest of the Club
  • Total Posts : 660
  • Joined: 2011/03/05 22:44:27
  • Status: offline
Kongsodoken Guest of the Club
Re: Torque tube rebuild 2022/06/23 20:57:09 (permalink)
Yes threaded bar to remove 
used high temp silicone as a lubricant and adhesive to push bearings in
then I built a wooden jig and used the scissor jack to push the shaft though the bearings 
the jig was 3 6”x6” pieces of MDF with central hole that kept the shaft perfectly aligned.
I was using super-bearings. 
 
I’m guessing you may need to get the bearing inserts made They are bound to be brittle and crack there is a drawings of sizes on Clarke’s garage 

1991 Improved 944 turbo
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