drivetrain vibrations

21
Hi Theo,

I am waiting to hear back about a local one avaliable. If it is not what I am looking for I have one in my cart at Pelican parts, BMW part number 26111106113 and will go that way.

May check on this bent ears theory first though. Hmmm.......

Surely the driveline shop would check that?




On Thu, 19 Oct 2017 at 8:55 AM, 'Theo' teows@melbpc.org.au [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

Nils,

May I ask where you bought the new rubber donut from?

Thanks,

Theo

 

From: Syncro_T3_Australia@yahoogroups.com [mailto:Syncro_T3_Australia@yahoogroups.com]
Sent: Thursday, 19 October 2017 4:44 AM
To: Syncro_T3_Australia@yahoogroups.com; Syncro_T3_Australia@yahoogroups.com
Subject: Re: [Syncro_T3_Australia] drivetrain vibrations

 

 

The ends are definatly in phase, that was one of my first reactions too. To check that for that very reason.

 

My feeling is that the rubber donut may be shot or that the cheap uni that has been put in there and keeps shedding all its grease is simply not rated for the application. So I have one of each on the way as well as 5 new gearbox mounts.

 

I chatted to the mob who reco'ed the driveshaft and to their credit they have taken ownership of the problem and are buying the spicer uni on my behalf and giving it to me wholesale price($178) and rebalancing once I have that and the donut.

 

So things are moving along slowly, mainly waiting for parts to show up but definatly will get to the bottom of this.

 

Nils

 

On Tue, 17 Oct 2017 at 9:46 AM, richo1166 richo1166@gmail.com [Syncro_T3_Australia]

 

Maybe silly. But when this shaft got rebuilt were the end yokes removed and fitted back in the same location i.e  not 90Deg out.

 

Not knowing everything that was done to your shaft. On a shaft with slip joints if he yokes were installed incorrectly there woukd be a vibration even if everything was aligned correctly..

 

Peter

 

 

 

Sent from my Samsung Galaxy smartphone.

 

-------- Original message --------

From: "Nils Birkmann nilsbirkmann@yahoo.com [Syncro_T3_Australia]" <Syncro_T3_Australia@yahoogroups.com>

Date: 17/10/17 09:22 (GMT+10:00)

Subject: Re: [Syncro_T3_Australia] drivetrain vibrations

 

 

You know what Peter, 

 

I'm going to do that. Out of curiosity. 

 

Nils

 

On Mon, 16 Oct 2017 at 11:20 PM, Peter Wilson peterw1000@gmail.com [Syncro_T3_Australia]

 

Hey Nils. Never had that issue but. Maybe get a dial indicator and see if the box and dif flanges are running true ? 

cheers pete

 

On Sat, Oct 14, 2017 at 6:29 PM, Nils Birkmann nilsbirkmann@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

 

Evening all

 

As some of you already know I am working though some vibration issues at the moment.

I have had the drive shaft rebuilt a few weeks ago including having the internal bushes remanufacted and the shat ground. I had a small vibration at 100km/h that slowly got worse, in fact wrecking the rearmost uni after 700km.

 I took it back to the shop and they replaced the uni. I once again installed, this time lasering the orientation of the front and rear gearboxes. My vibration was now at 80km/h. I took the tailshaft out again while at Old bar and decided to address it when I got home.

 

I have since everyday moved and shimmed the front and rear of the drivetrain, even having the unis within 0.1 degree of each other. Each time the vibration is at a different speed, but still always there. It looks to be getting worse as I fear the rear uni is on its way out again.

 

So I have decided to start afresh, I will replace the uni with a Genuine item instead of the "made in Italy" one that perishes every 1000km.

I will replace the rubber donut ( for some reason the driveline shop did not do this) and have it re balanced at a different shop.

 

I will also replace all the gearbox mounts as particularly the front diff looks pretty shabby.

 

What I am interested to know from the group is does anybody have a uni or donut they are willing to sell before I scour the internet

and secondly if anybody has experience with the powerflex gearbox mounts? particularly  whether they transfer extra noise?

 

 

Cheers,

 

Nils

 

22
Have you tried removing the driveshaft?
23
Ha ha.. yeah, about a dozen times now 😆

I keep going away for the weekend and getting jack of it by after 100km then pulling over to drop it out again. Leave it behind the seat till the next week. Test, check, realign, repeat.
Going to have replace these nuts and bolts again soon.


On Thu, 19 Oct 2017 at 1:28 PM, plander@optusnet.com.au [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

Have you tried removing the driveshaft?

24
Mine has the vibration with the shaft out.
25
Have you replaced the internal bearing/sleeve?
26
Yes the internal shaft was reground and the bushes have been remanufacted, very nice fit now. Makes a satisfing "POP" noise when you pull it out.

If yours vibrates with the shaft out, you have other problems Phil. Ide be checking things like tyres, cvs, axles, 


On Fri, 20 Oct 2017 at 7:08 AM, plander@optusnet.com.au [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

Have you replaced the internal bearing/sleeve?

27
Ten years trying to track it down. Not tyres/wheels shafts or cvs. Could be front diff maybe. It is a real pain.
28
I have spent a few thousand dollars trying to find this.
29
Phill,

I have a spare good front diff. Are you still coming to Victoria for DOTW?



-- 
Jon Bartlett
0424006192

On 20 October 2017 at 2:38:39 pm, plander@optusnet.com.au [Syncro_T3_Australia] (syncro_t3_australia@yahoogroups.com) wrote:

 

I have spent a few thousand dollars trying to find this.

30
Complete? How much?

Will probably be there.
31