Belt Slips
 

My Belts slips on my 92 400e under hard acceleration.
When it shifts 1-2 or 2-3 under hard acc.. it goes Sqeeek and the A/C compressor kicks off. It restarts after about 5 minutes or If i shut off and restart the car. I understand that there is a sensor that causes the shut off but whta can ultimately be done about the slipping. The tensioner setup is a joke. My V8 530i BMW has a seperate belt just for the A/C which probably prevents it from suffering the same fate.
No Matter how much I tighten the tensioner, it still slips.(Until it breaks)
I have 165K mi and just replaced both the belt and tensioner. The old tensioner Broke(mine only seem to last 30K mi/2years) and I decided what the hey and replaced the belt as well. I have it pretty tight yet it still slips. I dont want to break the new one. They're pricey at $230. HELP!

Have you check the belt tension shock?
Is the rubber bushing and the spacer OK?

I have to replace the tensioner once, and have remove the belt many times. But I never have any problem with the belt is not being able to tighten.

jack

There is no "shock" on the M.119 V8's. The tensioner is spring loaded. The tension comes from the internal resistance brought about by "tightening" the bolt. My BMW has a "spring" type tensioner. I just replaced the tensioner on it last month as well.