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-   -   CSB Preload? (http://www.maxbimmer.com/forums/showthread.php?t=154823)

Hal900x 12-10-2012 02:42 AM

CSB Preload?
 
I had been hearing a worsening clatter from directly below my handbrake/center console area while under torque. Sure enough, the CSB bracket was cracked and the crack had run into the actual assembly a bit too.

After replacing it and the Guibo, the same issue except the sound was now higher pitched and different in tone, but similar symptoms. The same cadence, if you will, and mostly when under torque. For whatever reason it has never occurred in reverse gear. We scratched our heads a bit and decided I had bad U-Joints that were either responsible for the sound themselves (at least in part) and/or immediately damaging the new CSB and thus the repeat symptom.

Tonight my buddy said he had the answer, which is that we failed to preload the CSB and it had shredded itself. We simple centered the bolts in the slots and tightened them down, when we should have pushed it forward and then tightened. I would like some input before I order another one and go through the whole mess again. Do you think a failure to preload would cause immediate major damage to the CSB? What kind of damage would you expect? He felt that not preloading would shred the rubber, but the old CSB was cracked mainly in the bracket and a bit into the assembly itself.

Thanks a lot for the feedback.

MaxBell 12-11-2012 04:29 AM

http://bit.ly/SSHYwT

Hal900x 12-11-2012 12:43 PM

Quote:

Originally Posted by MaxBell (Post 1591877)

Quote:

Originally Posted by Hal900x
Do you think a failure to preload would cause immediate major damage to the CSB? What kind of damage would you expect?

The purpose of this thread is diagnosis feedback, not installation instruction. Any results of that Google search pertaining to repeated damage/failure of a CSB after installation, I have already viewed and do not find an exact match to my situation. To boil it all the way down, I am trying to make an informed decision whether to try again, buying another new CSB under the assumption that our mistake was the only issue, or if there is more systemic problems requiring a driveshaft shop.

frankie591 12-11-2012 01:09 PM

if your u-joints are worn and notchy that could cause your guibo and csb to wear out faster than normal

Nick_V 12-11-2012 07:37 PM

Quote:

Originally Posted by Hal900x (Post 1591785)
Do you think a failure to preload would cause immediate major damage to the CSB?

I don't. Purely anecdotal, but I remember reading a thread pertaining to this on R3V (I think in the 24v swap section) where lots of people said they hadn't preloaded theirs and their cars were fine. I'm not saying it doesn't matter if you do or don't, but I can't see it causing, as you said, immediate major damage. I think you've got something else going on.

SamE30e 12-11-2012 09:03 PM

Pre-load 10mm forward IIRC.

It will cause pre-mature failure, not immediate. Unless you just do something stupid like unbolt it.


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