87 325is issue...

My son's 87 325is has developed an issue and I'm hoping for some solid advice on where to look. I'll be putting it up on a lift tomorrow and hope I can find the problem but I'm looking for advice
here. The car has developed what I can only describe as a hop type vibration in the drivetrain. I can compare it to a u-joint vibration but it's more intense. Things I'll be looking at tomorrow are the guibo's and the axle half shafts. I know they have a CV joint in them but I've never seen one do this. I also have a jingling coming from the front tire but since the ABS light came on today I think the ABS ring has come off the hub. I've heard people talk about this... Thanks...
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Psycho wrote:

I think you will find it is the guibo. When that goes it can cause a large offset in the driveline. It might also be one of the U joints, but not likely the center joint as that would just cause the floor of the car to shake. I'm sure it will be obvious when you start poking around...
--
-Fred W

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Fred W wrote:

While I usually suspect the center bearing carrier *first*. It doesn't much matter. Whenever you replace one of these, it usually makes sense to replace both. They're both cheap and easy. They are also much more likely culprits than anything having to do with either the U joint or the half shafts.
BTW, unless the E30 is different from the E28, if it has an automatic transmission, it will have no guibo. -- C.R. Krieger (Been there; done that)
P.S.: If you're not familiar with the term, 'guibo' is the flexible rubber disk (also referred to as a 'flex disk') at the rear end of the transmission that links the driveshaft to the output flange.
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I think there is a shaft extension on the transmission that engages a bushing in the driveshaft to assure proper alignment of the driveshaft regardless of the condition of the guibo. I suppose the bushing could be damaged but I haven't seen that happen. Psycho, could you try to explain what you mean by hop type vibration? At what speeds is it apparent? Is there any accompanying noise? I had an experience on my 318i where it developed a vibration that seemed to be at the same frequency as the drive shaft rotation. It was most pronounced at about 35 mph where the car 'sounded like a pickup truck with snow tires on it'. After removing the drive shaft and finding nothing wrong I discovered the problem to be a front wheel bearing. The balls rolling over the dent in the inner race just happened to be at the same frequency as the drive shaft and the impulse was resonating with the coil spring producing quite a loud noise. Anyway good luck finding it. Jack

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On Thu, 09 Mar 2006 08:51:58 -0500, Fred W

Well, my suspicions (and all of yours) were correct. The guibo had basically self destructed on me. Looks like I'll be going back to the BMW dealership tomorrow to get a guibo ($70) and most likely a center carrier bearing ($??). Can't see replacing one without the other and I missed the cutoff for getting it the Bavarian Autosport for delivery tomorrow...
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Psycho wrote:

The center carrier bearing is ~$35 or so, IIRC. Frankly, both together are probably less to repair than what you were suspecting. Glad we could be of assistance.
BTW, if you're doing much dealershhip service, you really ought to be in BMW CCA. Very few dealers do not offer at least a 10-15% club discount on everything. -- C.R. Krieger (Been there; done that)
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The dealer here wanted $115 for the carrier bearing assembly. I replaced the bearing itself (not the whole unit) for $17. Don't really do much dealer stuff as my car is older and they don't really have much for it.

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Psycho wrote:

Huh? How'd you do *that*? ISTR it's all one piece and the bearing is bonded to the rubber web of the carrier. I can believe you got a good deal on the whole thing, since I paid about the same amount for my last one. I'm a little stunned at the dealer price unless it includes installation.

You've got the wrong dealer. Get thee over to MyE28.com and find Brian Da Parts Pimp. Parts guy at BMW of Chattanooga who can and will get you anything BMW has anywhere worldwide - at the best possible price. -- C.R. Krieger (Been there; done that)
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If it had included installation, they'd have had the job! The actual bearing sits in a cup that's bonded to the rubber. It's held in by a lock ring.

I'll be doing that as I'm in need of a few parts that I'd rather get new if possible. Thanks!!!
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