Whine from the rear

[a.12912]

Hi,  a member for some time now and have only posted for help; now time to give back a little.

Having said what has been suggested and having had similar problems.

The remedy was: new non directional tyres.

The reason being as that directional tyres are noisy by nature in general and when tyres succumb to uneven ware such as on a lowered BMW with independent rear end. The tyres were worn to the wear indicators on the inside and on the outside was 3mm away. At approximately 60mph 100kmh the noise (wining / metallic drown) became unbearable.

Thoughts were wheel bearings, drive shafts, diff, centre bearing and or flex joint. Though having had a full vehicle inspection none of the above mentioned was a problem.

The remedies where; rotation of tyres (front to back),. alternatively replace with new non directional quality tyres (Toyo TEO Plus) as tested successfully.


Hope this information may help.

[sheepdog]

Thanks a.12912, I have never heard of this.
I am experiencing this right now and have been getting ready to do the bearings.
I have the same symptoms, inner and outer wear and directional tires. I am going to try swapping them around and see what happens or use my spares.

Would be nice if I did not have to do the bearings.
Thanks!

[sheepdog]

Well it calmed my whine down some, but not completely. Not sure if it is the tires or the bearings at this point.

[Demelich]

Another update.....

I replaced my diff.  The noise is still here.  I am going to replace my center support bearing once I get myself a new air compressor.

The only driveshaft I have messed with is with my 300ZX, it just has a rubber center support.  I did not realize that the BMW center support has an actual bearing that connects the two driveshaft pieces.  This has got to be it, it sounds exactly like a bad bearing.

[peerless]

I have done about 6 driveshafts on the E30's now. Typically the CSB is broken before the bearing goes out. But this is all on 6 cylinder cars where you have more torque. The M42 maybe easier on the driveshafts.

If your going to replace CSB, make sure of course to get the front flex disk. (I honestly don't know where the term 'guibo' ever came from.)

Be aware though every driveshaft I have pulled needed to be rebuilt. I have done 3 without rebuilding and every one has taken a crap within 6 months to a year. That was on 2 E30's and a 93' 540. They all ended up coming back for a driveshaft rebuild and ended up paying twice.

Another tip when removing the driveshaft, it is extremely important to keep the 2 drveshaft halves correctly aligned. Mark both halves clearly before separating the 2 halves. If not you WILL have a bad vibration and a huge headache trying to fix it.

Also guys (and gals) I specialize in E30 repair and service and run my own home based shop full time. I am new here so I didn't want to jump right in with advertising my shop. I do everything from driveshafts, suspension, dash replacements, engine rebuilding (currently building a M30, 2.9 M20, and 2 M42's), and anything else on a E30. Only things I don't do are paint and body.

[sheepdog]

I have done about 6 driveshafts on the E30's now. Typically the CSB is broken before the bearing goes out. But this is all on 6 cylinder cars where you have more torque. The M42 maybe easier on the driveshafts.

If your going to replace CSB, make sure of course to get the front flex disk. (I honestly don't know where the term 'guibo' ever came from.)

Be aware though every driveshaft I have pulled needed to be rebuilt. I have done 3 without rebuilding and every one has taken a crap within 6 months to a year. That was on 2 E30's and a 93' 540. They all ended up coming back for a driveshaft rebuild and ended up paying twice.

Another tip when removing the driveshaft, it is extremely important to keep the 2 drveshaft halves correctly aligned. Mark both halves clearly before separating the 2 halves. If not you WILL have a bad vibration and a huge headache trying to fix it.

Also guys (and gals) I specialize in E30 repair and service and run my own home based shop full time. I am new here so I didn't want to jump right in with advertising my shop. I do everything from driveshafts, suspension, dash replacements, engine rebuilding (currently building a M30, 2.9 M20, and 2 M42's), and anything else on a E30. Only things I don't do are paint and body.

Wish you lived closer to me, I would have you do my wheel bearings.

[ScreamerBeemer]

Ditto

[el_gringo]

Sounds like your trunk hinges are loose... or maybe the blinker fluid pump is going out. While your at it, update your fluxcapacitor...



Oh yeah, don't forget to lube the tampon dispenser. ;-)

[el_gringo]

Ok now to be serious: your diff is fucked. When its locked it wil usually whine like a screaming cat. Trust me, my old eta did this from beating on it. (My eta would eat a m42).

Check the fluid.
Then drain it and fill it properly with the CORRECT fluid and possibly additive.
Then drive.

If it keeps whining, come back.

Yes, when you put the transmission in neutral, the diff will keep spinning, dumbass.

Shoot me a pm if you have anymore questions.