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Cardan shaft DIY...and other stuff...

 
Old 05-04-2019, 01:47 PM
  #106  
oldskewel
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You sound like you did it pretty carefully, but since you asked, here are some ideas ...

- I assume there was no rotation of the driveshaft during assembly, so the new flex disk went in the same way the old one came out, vs. for example no random 1/6 rotation happening in there.

- Maybe the tightening sequence was important. I understand the loosening of the bearing support to get the wiggle room needed. But I would probably have followed up with ... install the flex disk fasteners, finger tight or looser ; torque down the bearing support, trying to make it exactly as it was before ; torquing of the flex disk fasteners ... test drive. Not sure if that's what you did. But if you torqued down the flex disk first, it could be that the bearing support was not alignable when you then torqued that down, and being slightly misaligned, led to a vibration.

BTW, I'm at almost 104k miles on my 2004 S with no Cardan shaft problems yet. Getting ready for a pre-emptive repair on that. Once you get all done with this, I'll be curious what you think about replacing the flex disk (guibo, giubo) at the same time. I've read that it's the stiffening of the flex disk that leads to the bearing support failure, so they recommend doing both when the bearing support fails.
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Old 05-04-2019, 05:05 PM
  #107  
J'sWorld
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I hate to admit it, but years ago I tried to do my own center bearing replacement. I'm pretty good with this type of stuff and have assembled plenty of CV's without problem. I never could get the shaft to stop vibrating after so I gave up and bought one from Vertex. I did everything right. I marked orientation at both end and the middle before disassembly. I replaced the GUIBO. I even had to return one to vertex the second time around. It was defective. They rebuild a bunch of them. Who knows.

Never again. It's such a poor, cheap design. The flange on the trans and rear diff is balanced at the factory that makes them. Orientation shouldn't matter here.

I have added the one piece driveshaft from DSS to my list of Cayenne reliabilty/basic mods. ~$900 and never look back.
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Old 05-04-2019, 06:32 PM
  #108  
95_993
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Originally Posted by David944s2
Last year I replaced the failed center bearing support with you Drive Shaft Clamping Center Support product on my ’08 Cayenne S without any issue at all. I drove the car for over a year and decided to do some preventative maintenance and replaced the Flex Disk yesterday.

The replacement was straight forward, loosened the center bearing support mounts to get some wiggle room and removed/replaced re-checked washer orientation on flex disk, followed directions on torque settings. Tightened up the center support, looked around, all looked, felt good.

On my test drive I picked-up a meaningful vibration in the drive shaft at about 30mph, worst at 35mph and starts to disappear around 40mph. I went under the car today, everything is tight and looks good. The internet hasn’t helped, just some references to a bearing alignment tool for the center support bearing, but nothing much else.

I thought maybe there is an orientation issue between the Cardan Shaft and the transmission, but I don’t see anything there at all.

Ideas?
I suggest loosening the 4 bolts holding the center bearing slightly , move the car back and for slightly and gently. Climb back under and tighten all down on the center bearing bracket.

Worked for me after installing EPS bearing support.
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Old 05-07-2019, 11:42 AM
  #109  
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Originally Posted by J'sWorld View Post
I hate to admit it, but years ago I tried to do my own center bearing replacement. I'm pretty good with this type of stuff and have assembled plenty of CV's without problem. I never could get the shaft to stop vibrating after so I gave up and bought one from Vertex. I did everything right. I marked orientation at both end and the middle before disassembly. I replaced the GUIBO. I even had to return one to vertex the second time around. It was defective. They rebuild a bunch of them. Who knows.

Never again. It's such a poor, cheap design. The flange on the trans and rear diff is balanced at the factory that makes them. Orientation shouldn't matter here.

I have added the one piece driveshaft from DSS to my list of Cayenne reliabilty/basic mods. ~$900 and never look back.
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