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Help, I keep breaking flex plates!

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Old May 7, 2010 | 10:59 AM
  #16  
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Thanks to all for their help so far!

I havent considered torque tube bearing migration. From what I understand I can use a tape measure in the front of the TT to see if there is bearing movement. Does anyone know how many inches the bearing should be from the front of th TT?

Could the engine go into limp mode every now and then - maybe unnoticed?
No, the car has been running perfectly.

With Kurt's help (thanks Kurt for the perfect description of the noise!) I will measure the crank end play.

Troy
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Old May 7, 2010 | 11:04 AM
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Hi Greg,

My bet is you have some kind of harmonic issue going on, it takes a lot of HP to just break one.
Could a harmonic balancer be the cause?

Troy
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Old May 7, 2010 | 11:14 AM
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Dave,
Last night after I posted this thread I found a used flywheel complete with the flex plate off a 93 gts donor. I have never replaced the flywheel only the flex plate. Porsche only sells a combination flywheel / flex plate as a replacement...so I guess I will start there.

Troy
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Old May 7, 2010 | 11:16 AM
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Originally Posted by troy928
Hi Greg,


Could a harmonic balancer be the cause?

Troy
It could be, but it is way down my list of things that could cause it.

Listen to what others are telling you about the TT bearings, that would be the first place I would look.
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Old May 7, 2010 | 11:25 AM
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Can you post a pic of the broken flex plates? I'd be interested in seeing how it failed. It may also give a clue as to what's causing it.
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Old May 7, 2010 | 11:27 AM
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Listen to what others are telling you about the TT bearings, that would be the first place I would look.
Thanks Greg, I will...I have had 2 rennlist members (Kurt & Hans) listen to the torque tube and there is no unusal noise but I will check for bearing travel.
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Old May 7, 2010 | 11:33 AM
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Can you post a pic of the broken flex plates? I'd be interested in seeing how it failed. It may also give a clue as to what's causing it.
I can as soon as I get it out beacuse now the pinch clamp is seized on the TT shaft because I used loctite...any suggestions on how to break the loctie loose?
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Old May 7, 2010 | 11:40 AM
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Originally Posted by troy928
I can as soon as I get it out beacuse now the pinch clamp is seized on the TT shaft because I used loctite...any suggestions on how to break the loctie loose?
Heat. Not like hair dryer heat, more like MAPP gas heat.
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Old May 7, 2010 | 11:42 AM
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Originally Posted by blown 87
It could be, but it is way down my list of things that could cause it.

Listen to what others are telling you about the TT bearings, that would be the first place I would look.
The last time I relpaced the flex plate I did notice a lot of up & down, side to side movement with the torque tube shaft.

Do you think if I add another bearing to the front of the TT to have a total fo 4 in the shaft housing, could it help solve my problem without rebuilding the TT?
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Old May 7, 2010 | 11:47 AM
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Originally Posted by troy928
The last time I relpaced the flex plate I did notice a lot of up & down, side to side movement with the torque tube shaft.

Do you think if I add another bearing to the front of the TT to have a total fo 4 in the shaft housing, could it help solve my problem without rebuilding the TT?
Nope
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Old May 7, 2010 | 11:53 AM
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Originally Posted by troy928
The last time I relpaced the flex plate I did notice a lot of up & down, side to side movement with the torque tube shaft.
Oooo... that's telling. Me thinks you need a rebuilt TT (and a new flex plate).
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Old May 7, 2010 | 11:54 AM
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Originally Posted by Andrew Olson
Oooo... that's telling. Me thinks you need a rebuilt TT (and a new flex plate).
And a SuperClamp.
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Old May 7, 2010 | 12:05 PM
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I just got off the phone with Roger Tyson, and he feels like a lot of you, that the problem lies in the TT. Either the bearings have migrated to the rear of the car or the TT shaft may be warped or bent.
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Old May 7, 2010 | 02:18 PM
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dont bother putting ain a new fleax plate till you repair the TT once your TT is apart you will want to check it for True roll the ds on a smooth surface and inspect the ends if one or the other is bent this can also damage the any flexplate you install as well as a migrated bearing, all of this will probably also transmit a damaging force to the thrust bearing in the engine and the torque converter bearings... SO your now going to have to fix the real problem instead of fitting a new part that will soon break
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Old May 7, 2010 | 02:27 PM
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Originally Posted by Mrmerlin
dont bother putting ain a new fleax plate till you repair the TT once your TT is apart you will want to check it for True roll the ds on a smooth surface and inspect the ends if one or the other is bent this can also damage the any flexplate you install as well as a migrated bearing, all of this will probably also transmit a damaging force to the thrust bearing in the engine and the torque converter bearings... SO your now going to have to fix the real problem instead of fitting a new part that will soon break
Thank you for your advice and I will take heed...will let you know what I found with the TT.
Troy
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