Torque tube bearing replacement
Thread Starter
Instructor
Joined: Apr 2008
Posts: 248
Likes: 1
From: Boisbriand, Québec, Canada
Torque tube bearing replacement
Hi,
I pulled the 2 bearing assemblies out of my torque tube hoping to press the bearing rollers out for replacement. As opposed other member's experience, my rollers appear to be embedded in the large metal/rubber ring. On both sides a lip appears to prevent pressing them out.
Can the bearings be pulled out of that type of assembly? If so how? If not, where can I get a replacement?
Thanks
Michel
89 928 S4 auto
I pulled the 2 bearing assemblies out of my torque tube hoping to press the bearing rollers out for replacement. As opposed other member's experience, my rollers appear to be embedded in the large metal/rubber ring. On both sides a lip appears to prevent pressing them out.
Can the bearings be pulled out of that type of assembly? If so how? If not, where can I get a replacement?
Thanks
Michel
89 928 S4 auto
Last edited by mirousse; Jun 20, 2014 at 07:49 PM.
Thread Starter
Instructor
Joined: Apr 2008
Posts: 248
Likes: 1
From: Boisbriand, Québec, Canada
BTW I followed this reference for easily pulling the bearings out. I used 2 pieces of hardwood flooring in layers instead of a metal plate.
http://home.comcast.net/~gq-beej/928/ttrebuild.htm
http://home.comcast.net/~gq-beej/928/ttrebuild.htm
Last edited by mirousse; Jun 20, 2014 at 07:49 PM.
Trending Topics
Three Wheelin'
Joined: Jan 2003
Posts: 1,993
Likes: 87
From: Netherlands
And this method works! Thank you for inventing this method and above all, sharing it with us. Here are a couple of pictures of my TT bearing replacement
http://www.ad928.punt.nl/mediaalbum/...s/9/Torquetube
http://www.ad928.punt.nl/mediaalbum/...s/9/Torquetube
Last edited by Ad0911; Jun 21, 2014 at 03:31 PM.
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Six Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile
Joe Kucinski
10 Used Porsches Are Selling for Way Too Cheap
Joe Kucinski
Tuner Is Converting Porsche 911s Into Shooting Brakes
Verdad Gallardo
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917
Verdad Gallardo
Is This Convertible Cayenne A Steal, Or A Returnless Investment?
Verdad Gallardo
10 Best Non-Flat Six Porsches You Can Buy For Under $100K
Joe Kucinski
Porsche's Top 5 Most Questionable Naming Decisions
Verdad Gallardo
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field
Verdad Gallardo
6 Convertible Top MYTHS Most People Don't Understand!
Michael S. Palmer
You can call me Otis
Rennlist Member
Rennlist Member
Joined: Feb 2013
Posts: 6,661
Likes: 10
From: Terre Haute, Indiana
Great pics, very clear, good documentation on the fix, but.... The if the front bearing is too far back, it will allow increased harmonic vibrations in the unsupported length of the shaft between the front bearing and the flex plate clamp. The front edge of the bearing outer ring (with the rubber) should only be about 4 inches from the front edge of the flange of the TT. This was the original position of mine before it started migrating rearward, the further rearward it got, the harmonic wobble effect increased, exponentially, which aided it the slippage of the flex plate clamp. When I discovered the cause of my engine/drive train vibration I found three major things.
1, the front bearing had migrated 13 inches rearward (noted by the longitudinal marks visible on the wall of the TT,
2, there was visible evidence of the pinch clamp slippage on the splines,
3, the flex plate was fractured by the force of forward pressure of the clamp.
I have come to the conclusion that this series of failing events is not the cause of inadequate clamping force alone, but the minimal surface area of the original bearing outer ring which is only one inch wide. Imagine if you will, the centrifugal force and thrusst of the splined shaft working together, on one end there is a little clamp, on the other is a thin bearing holding the wall of the tube. I'm no physics major, but its easy to understand that a greater clamping force and a larger bearing surface area against the TT wall will diminish the wobble effect of the shaft that leads to bearing migration and clamp slippage.
1, the front bearing had migrated 13 inches rearward (noted by the longitudinal marks visible on the wall of the TT,
2, there was visible evidence of the pinch clamp slippage on the splines,
3, the flex plate was fractured by the force of forward pressure of the clamp.
I have come to the conclusion that this series of failing events is not the cause of inadequate clamping force alone, but the minimal surface area of the original bearing outer ring which is only one inch wide. Imagine if you will, the centrifugal force and thrusst of the splined shaft working together, on one end there is a little clamp, on the other is a thin bearing holding the wall of the tube. I'm no physics major, but its easy to understand that a greater clamping force and a larger bearing surface area against the TT wall will diminish the wobble effect of the shaft that leads to bearing migration and clamp slippage.
Last edited by OTR18WHEELER; Nov 9, 2014 at 02:36 PM. Reason: editing
Rennlist Member
Joined: Jul 2008
Posts: 2,200
Likes: 2
From: Aurora, Ontario, Canada
And, which is why you should just call Constantine at Black Sea, and be done with the whole issue.
Do a search Michel, you'll see what I mean.
Et, ce qui est pourquoi vous devez juste appeler Constantine à la mer Noire, et faire avec toute la question.
Effectuez une recherche Michel, vous verrez ce que je veux dire.
Do a search Michel, you'll see what I mean.
Et, ce qui est pourquoi vous devez juste appeler Constantine à la mer Noire, et faire avec toute la question.
Effectuez une recherche Michel, vous verrez ce que je veux dire.
Thread Starter
Instructor
Joined: Apr 2008
Posts: 248
Likes: 1
From: Boisbriand, Québec, Canada
Salut Rob!
I rebuilt the tube back in June along with the tranny. The car has log at least 4000km since without a single issue. Neither driveshaft movement nor vibrations were at stake before rebuilt. I found the bearings to be noisy when turning by hands that's all. While at the tranny might as well do them! I haven't considered Constantine so I can't really speak about it.
A bientot!
Michel
I rebuilt the tube back in June along with the tranny. The car has log at least 4000km since without a single issue. Neither driveshaft movement nor vibrations were at stake before rebuilt. I found the bearings to be noisy when turning by hands that's all. While at the tranny might as well do them! I haven't considered Constantine so I can't really speak about it.
A bientot!
Michel