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-   -   flexx disk torqued right? (http://www.bimmerfest.com/forums/showthread.php?t=673858)

Toopricey01 02-02-2013 06:31 AM

flexx disk torqued right?
 
1 Attachment(s)
Vibration under acceleration.. i attached a photo below of the flex disk. can you please help? Do you think this would cause the vibration? Thanks

mr_bean 02-02-2013 06:52 AM

To me, it looks like the flange on the drive shaft is too far forward (too close to the flange on the trans). The guibo looks stressed.
If you unbolt the drive shaft from the trans, you should be able to compress the drive shaft so that its flange lines up correctly with the guibo.
Also, make sure centering ring inside the output flange on the trans is in good shape.

Toopricey01 02-02-2013 07:38 AM

Driveshaft collar nut
 
Also, does anyone know how tight the collar nut on the driveshaft should be? where the driveshaft splits? Thanks a lot

Siskin 02-02-2013 08:01 AM

As long as you're unbolting the driveshaft, check the center bearings (or any bearings for that matter). I just recently replaced my entire driveshaft due to a seized center bearing.

It was causing similar issues to those you describe. You SHOULD be able to just replace the bearing; mine was just especially f'd.

Toopricey01 02-02-2013 08:14 AM

Believe it or not i just recently replaced the driveshaft with a rebuilt one and that came with a new CSB! but i had a guy install it for me and he installed the csb upside down, therefore i was getting a smacking and all kinds of vibrations, when i called him to ask him about it he said " oh it will go away, its just smacking on the heat shield that i bent" wtf really.. i did drive the car for a week or so like this, so maybe the bearing that was new is bad now as well ughhhhh

Siskin 02-02-2013 08:44 AM

If he installed your CSB upside down and bent your heat shield, I would definitely be suspicious of anything he touched while he was in there.

SJBimmer 02-02-2013 09:55 AM

Quote:

Originally Posted by mr_bean (Post 7354569)
To me, it looks like the flange on the drive shaft is too far forward (too close to the flange on the trans). The guibo looks stressed.
If you unbolt the drive shaft from the trans, you should be able to compress the drive shaft so that its flange lines up correctly with the guibo.
Also, make sure centering ring inside the output flange on the trans is in good shape.

Spot on. That guibo is not going to last long running like that.


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