Drive shaft bolts....?

[Yakinho]

I agree with everyone that says you should not be having this problem if the correct bolts are used and they are correctly torqued. But the failure of the CSB provides a clue as to why this might be happening. In almost all cases, a failure of the rubber mount of the CSB will be due to binding u-joints in the drive shaft. Which means that both the CSB and drive shaft require replacement. The binding u-joints will place unusual loads on the guibo and probably explains why the bolts are loosening.

Yes, this makes sense to me too, but it doesn't explain why I'd have the problem 7 or 8 months down the road after the CSB was replaced. I checked the u-joints as well, they're fine. Drive shaft is also aligned correctly. If I can't figure it out soon I'm just going to lock tight them down.

[jlevie]

By the u-joints being fine do you mean that they were smooth and easy to move when you had the drive shaft out? That's kind of hard for me to believe if the CSB was torn.

[Yakinho]

They weren't incredibly easy, but they seemed fine for a car with 210k miles.

[Axxe]

Aluminum bolts?

[Yakinho]

Just the one... It's lasted longer than the OEM bolts... :( Currently waiting for more to come in the mail since lovely Tischer BMW of Silver Spring never has them. Not to mention every time they're going to call me, they never do...

[jlevie]

They weren't incredibly easy, but they seemed fine for a car with 210k miles

They should have been easy to move and very smooth. Stiff or notchy u-joints are cause to replace same, especially when accompanied by a CSB failure.

[Tree18is]

Ive broken those bolts before, I dont know why there so skinny, Ive notice the early cars with the big three CSB have bigger bolts. I dont know why thats not a high HP mod for some of you guys.

[nando]

Ive broken those bolts before, I dont know why there so skinny, Ive notice the early cars with the big three CSB have bigger bolts. I dont know why thats not a high HP mod for some of you guys.

because nobody else seems to have a problem with them breaking..

[Tree18is]

because nobody else seems to have a problem with them breaking..

your right, only I get that shit handed to me.

also Ive broken two pedal assemblys at the clutch.

[AndrewBird]

It has to be vibration. Nylon inserted nuts won't loosen even if they aren't torqued down. That is the whole point of them. They are used in many places where you need something to be loose and not come apart.