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-   -   '08 Z4 6spd 3.0I Input Shaft issues (http://www.bimmerfest.com/forums/showthread.php?t=596521)

GnattheCat 01-25-2012 09:59 AM

'08 Z4 6spd 3.0I Input Shaft issues
 
Took my Z4 into the dealership for what I thought was a realase bearing noise. Service Mgr says it sounds more like the transmissions input shaft. Anyone else out there had any simular experience? Says the noise "may" be normal(?) Thx Gnatthecat

chickdr 01-25-2012 10:31 AM

Quote:

Originally Posted by GnattheCat (Post 6585920)
Took my Z4 into the dealership for what I thought was a realase bearing noise. Service Mgr says it sounds more like the transmissions input shaft. Anyone else out there had any simular experience? Says the noise "may" be normal(?) Thx Gnatthecat

I would assume you are still under warranty? Make sure to have the issue noted in case it turns out to be a problem later.

Telememo 01-27-2012 09:44 AM

Had the same issue on my certified pre-owned, took the car back to the dealership on the first week and they replaced the transmission with a new unit. This was at almost 50k miles. The noise has come back at around 53k, said it was the clutch bearing had the whole clutch replaced. Noise gone for another 2k miles and it is back again. My conclusion is that it is "normal", though I think "normal" should be quiet and not make any noise.

rickllyell53 10-17-2012 08:00 AM

z4 input shaft bearing
 
I have some 'rattling' noise with my 07 Z4 coupe engine idling, manual transmission in neutral, and my foot off the clutch. Noise stops when clutch pedal is pushed in.

Also don't know if this is related, but the gear engagement is notchy and even feels like I'm hitting a gear tooth now and then. With the mileage at 41k seems it's past the brake in period. I've had an 86- 325 and a 98-328 and know shifting isn't the swiftest in these cars, but the Z4 shift engagement is not as smooth as these previous cars.

So taking it in to the dealer (under warrenty) I get the same 'noise is normal' diagnosis, but my independent BMW mechanic says it's the input shaft bearing.

Hoping to get some comments on similar noises and or shifting. Then I'll go back to the dealer, try again and post the results.
Thanks

GnattheCat 10-17-2012 08:50 AM

Input Shaft
 
On the first go around, the dealer determined that the problem rested with the flywheel. Excessive play(?) They replaced the flywheel and the clutch components. When the car is in 1st gear and under load going uphill I still get a "whir, whir, whir" sound. I believe that the eccentric flywheel damaged the input shaft which is why I still get the noise. All to be determined. Car now has 37K and it's about time I became a pest at the dealership, again.

Telememo 10-17-2012 09:07 AM

When taking your car to the dealer be sure to turn off the AC/fan, it will be a lot easier to hear the rattling. I also had the same noise on a 2000 328i, but that one started around 110k and I just used it like than until I sold it with 155k. The Z4 is gone, had 60k, never really got to have the problem go away, even with transmission (including throw out bearing) and cluth replacement and CDV delete. Dealer never mentioned the flywheel. Like I said before I believe this is "normal" for manual BMWs, but it should not be that way!


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