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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 03-09-2013, 09:40 PM
OneBadTexican OneBadTexican is offline
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Rough vibration in rear during acceleration and then ok?

I have a 1997 328i Convertible which for some time has been developing a rough vibration in what seems to be the right rear portion of the car at EXACTLY 25 miles per hour. A friend drove with me and he says he feels it more in the center of the car.

Regardless, it's a vibration that feels like something is going to come loose or something but as I speed up the vibration instantly goes away. Like I said, it is at EXACTLY 25 miles an hour and I can't figure it.

I have replaced the tires and rims and aligned front and rear. Had all the bolts on the drive shaft checked. A friend told me he suspected it may be the differential but don't know for sure.

Does anybody have any idea what I might look or what the suspected problem might be?
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  #2  
Old 03-09-2013, 09:54 PM
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E36 Phantom E36 Phantom is offline
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Check out the giubo (aka flex disk) - does the car make any noise at that speed like a dull thumping? DS could also be out of balance and 25MPH is where the harmonic frequency creates the vibration.

If you accelerate TO 25 MPH and just maintain the speed, does the vibration continue both under load and while coasting?
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  #3  
Old 03-09-2013, 10:07 PM
OneBadTexican OneBadTexican is offline
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Yes there is a dull thumping and yes if I remain at the exact same speed that the vibration occurs, the rough vibration will continue until I accelerate past that speed. As I am driving everything is fine but in stop and go traffic it is extremely noticeable.

I have read about the flex disc on other comments and will order one on Monday just to rule that out also. Are there things I should watch out for in order to rule out the differential? Of course I would like it not to be the differential as it would be way cheaper if it weren't but I am not knowledgeable as to what symptoms to look for.


Thanks!
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  #4  
Old 03-09-2013, 10:43 PM
brenna00 brenna00 is offline
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Check the flex disc. If that is fine I would suspect the universal joints. You might need to have your drive shaft rebuilt.
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  #5  
Old 03-09-2013, 10:45 PM
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E36 Phantom E36 Phantom is offline
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I don't think that would be related to the diff at all.

Get under the car and look at the flex disk, if it's cracked or deteriorating get a new one, otherwise don't bother. Might pull the DS and take it to a machine shop to check the balance. If the UJs were bad I'd expect the issue to start small and get worse the faster the DS was rotating, but I could be wrong.
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  #6  
Old 03-09-2013, 11:13 PM
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hornhospital hornhospital is offline
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If you do decide to order the flex disc, get a new center support bearing and change it at the same time. You'll have to drop it down to change the disc anyway, and it's not expensive. If the flex disc is deteriorated to the point it's vibrating, it's almost certainly damaged the rubber mounting that the CSB is riding in (it's all vulcanized together).

Pelican has a good write-up on the whole driveshaft removal and replacement.

http://www.pelicanparts.com/bmw/tech.../E36-Guibo.htm

http://www.pelicanparts.com/bmw/tech...ft_Bearing.htm
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  #7  
Old 03-09-2013, 11:40 PM
OneBadTexican OneBadTexican is offline
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Thank you for your help!

Thank you all for your help and advice. I will leave the differential as a last resort as no one seems to believe that could be my problem.

I will take all your suggestions and try each one at a time.

Thanks again everyone!
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  #8  
Old 03-12-2013, 03:34 PM
OneBadTexican OneBadTexican is offline
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Could it be anything else?

I have ordered the flex disc and the center support bearing. I hope this does the trick. In reading several other posts however I am curious as to whether it might be something in addition to those parts. The reason I say this is because to me the vibration seems to happen only on the right rear side of the vehicle. Also, after thinking about it I have prematurely worn the right rear tire twice. To the point where the wire is protruding while the other three tires looked brand new. That's why on both occasions I did a full alignment thinking this could be an alignment problem. I also replace the shocks in the rear but still it wore out this 3rd tire prematurely.

At this time it's the vibration that is really of concern to me because as I am accelerating it vibrates violently on the right rear only but then after 25 miles an hour it's back to normal or at the very least not noticeable.

I am wondering if one of the previous suggestions may be in line with what I am experiencing. That being the possibilty of the u-joints or something right side related.

Any additional ideas?
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  #9  
Old 03-12-2013, 03:36 PM
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petriej petriej is offline
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It's Giubo...

Oh wait, you spelled it right! Thanks, Chad!

OP: I hope it works out for you. Seems odd that it would only be at 25mph.
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Quote:
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Jared, why don't you just put "It's Giubo" in your sig? Save a lot of typing.
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Originally Posted by e36 miguel View Post
this jared guy sounds intimidating lol.
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  #10  
Old 03-12-2013, 04:01 PM
OneBadTexican OneBadTexican is offline
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Is it possible a differential mount could be bad?

Since in my perception the vibration seems to come from the right side, in addition to the suggestions given, is it possible or even feasible to purchase the differential mounts and do everything at the same time or would it be a waste of money until I rule out the flex disc and center mount bearing?
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  #11  
Old 03-12-2013, 04:21 PM
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ZeGerman ZeGerman is offline
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Have you considered actually getting under the car and inspecting it to see what's wrong? I mean, if you've worn out your RR tire two times, and are working on a third time, something is obviously out of whack. It makes a lot more sense to inspect it rather than just plunking down your debit card and buying parts without confirming what is actually wrong.
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Last edited by ZeGerman; 03-12-2013 at 04:23 PM.
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  #12  
Old 03-12-2013, 04:26 PM
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E36 Phantom E36 Phantom is offline
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Quote:
Originally Posted by OneBadTexican View Post
Since in my perception the vibration seems to come from the right side, in addition to the suggestions given, is it possible or even feasible to purchase the differential mounts and do everything at the same time or would it be a waste of money until I rule out the flex disc and center mount bearing?
Can I ask why you waited 10 posts to mention this little tidbit? That completely changes things. Go look at the suspension on that wheel and see which bushing is completely shot.
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// Chad // 2001 BMW 740i M-Sport // 2002 Lexus LX470 //
// 1997 BMW 328iS Sport // 1995 BMW 540i/6 Sport //
// 2000 Kawasaki Concours 1000 // 1998 Honda CBR900RR //



Quote:
Originally Posted by SlimKlim View Post
You're a derbanana
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  #13  
Old 03-12-2013, 04:28 PM
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ZeGerman ZeGerman is offline
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I'm guessing it's a rear control arm bushing, thereby allowing the tire to go out of alignment, which would explain the vibration at a specific speed and premature tire wear on that corner.
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Last edited by ZeGerman; 03-12-2013 at 04:29 PM.
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  #14  
Old 03-12-2013, 04:41 PM
OneBadTexican OneBadTexican is offline
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I apologize

You are all absolutely right! I didn't think of mentioning it until I thought that even though I am the only one that feels it on the right rear and everybody says it feels like the center of the car. But then I thought of the right tire wasting away so rapidly and it caused me to add to my symptoms.

BTW, I have gone underneath and looked for wear on those items suggested and in all honesty they seen fine. I never did however check the bushings which is probably where I should have started. I am still replacing the flex disc and the center support bearing only because I ordered them and they were cheap enough for preventative maintenance. I will check the bushings.

Thanks again!
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