drivetrain vibrations

1
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
2
HI Nils

I had the same earlier this year due to an bad U-joint, I replaced the U-joint and had the shaft balanced which was OK for a little while but then it returned.  I didn't do anything about the donut or sleeve,I also had many attempts at angles and shimming with no success.

Anyway I had a solid shaft built locally like the GoWesty one and its been running trouble free for about 7000 km's now.  If you can't find/fix the vibration then maybe a solid shaft is an option for you aswell, or any one else for that matter. If there's any interest I could get some more made.

Regards, Uwe
3
I have heard that so many times now Uwe,

And was indeed my first thought, but the syncros ran 100000km with the donut there just fine and surely VW put it there for a reason.

Anyways I'm over $500 deep in this now, I guess i am commites to this course of action.

But will definatly keep that option it mind, thanks.

Nils


On Sun, 15 Oct 2017 at 10:28 AM, 911jack@gmail.com [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

HI Nils

I had the same earlier this year due to an bad U-joint, I replaced the U-joint and had the shaft balanced which was OK for a little while but then it returned.  I didn't do anything about the donut or sleeve,I also had many attempts at angles and shimming with no success.

Anyway I had a solid shaft built locally like the GoWesty one and its been running trouble free for about 7000 km's now.  If you can't find/fix the vibration then maybe a solid shaft is an option for you aswell, or any one else for that matter. If there's any interest I could get some more made.

Regards, Uwe

4
No problem Nils, I decided to switch after my first balance failed so I wasn't in so deep. My car has done 300000k so possibly the original shaft was in all that time which a big plus for VW.

Of course anything is fixable, so I'm keen to know what it once you find the solution, my original shaft may live again.

Uwe
5

Hi Nils,


Troublesome indeed, especially where the objective is a 24/7 4WD capable, VC based, vibration free drivetrain.


Why not go straight to the horses mouth via telephone of an evening, say 8pm Queensland time and seek free helpul advice from Rudi? He's quite amiable and happy to speak one on one over the telephone about syncro drivetrain issues in particular. Might get you heading down the right path more quickly.


For what it's worth, I followed Rudi's advice 10 years ago and he fitted for me a solid shaft, decoupler and supplied and connected all necessary components to activate an existing rear difflocking transaxle.


I don't believe my propshaft has a vibration at speed but if it has, I rarely if ever would know it as I have no need for and avoid 4WD engagement at speed. As advised, I reserve it for low speed offroad/difficult conditions.


The drivetrain I agreed to have fitted is similar to his own, except Rudi also has a front difflock. His advice to me was that the majority of usual driving in Australia can readily and safely be accomplished in 2WD. Meaning also that for the majority of driving, the front portion components of the drivetrain remain unstressed, happily unengaged for the most part and always at the ready if required.


No regrets at all for having Rudi fit and for me to use this system over the ensuing 10 years. Never since regretted removing the VC forever (stored as a novelty piece), nor evermore be concerned with a (if at all present) vibration in the propshaft and a big AND, .... very happily, .... not since had reason to revisit Rudi for drivetrain component/s remediation. 


Far be it for me, a novice, to question or ignore the masters advice. I recommend you try him also.

Cheers.

Ken





From: Syncro_T3_Australia@yahoogroups.com <Syncro_T3_Australia@yahoogroups.com> on behalf of Nils Birkmann nilsbirkmann@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com>
Sent: Saturday, 14 October 2017 7:29 PM
To: Syncro_T3_Australia@yahoogroups.com
Subject: [Syncro_T3_Australia] drivetrain vibrations
 
 

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

6
I'm wrestling the same problems after a complete front-end rebuild that included replacing the front diff mounts with powerflex poly bushes.

I replaced and centred the uni joints, checked the bushes (nice and tight), checked the axial runout at both flanges and at the centre of the shaft with a dial indicator (within spec at .002"), replaced the rear transmission mounts as well, laser-aligned the whole caboodle, tried the tailshaft in the 16 different positions allowed by the bolt pattern, but vibration still exists at 75-80 kmh. Disappears when shaft removed.

I made up a laser pointer that attaches to the output/input flanges of the transaxle and front diff, discovering that although it is possible to align them along the longitudinal axis, they are impossible to align on a vertical axis without serious re-engineering. Shimming the front diff mounts improved the issue a bit, and I will replace the tailshaft again over the next few days to see if it works.

If not, the next step is to have the tailshaft re-balanced or have a new one manufactured.

Balancing a used tailshaft seems like a temporary fix so a new one looks tempting, especially if it uses uni joints that are readily available.

Yes, the poly-bushes do transmit more noise. I am tempted to put the old rubber ones back in to see if that resolves the vibration problem, but I didn't think too mark them for orientation before removing them.

I have seen on U-Tube that an NVH meter allied with a strobe light can be used for on-car balancing (on the hoist) at the road speed where vibration is known to be a problem - a big improvement over balancing on the bench at a maximum 1000 rpm, which does not reflect the real-world. The tailshaft spins much faster than that at highway speeds. Simple screw-on hose clamps are used for balance weights.

Uwe, I would be interested to know who made up your tailshaft. Does it use commonly available uni joints? Are they greasable, or sealed-for-life? Sliding yoke?

Roger.
7
Thanks for the feedback in regards to the powerflex bushes, would have made me pretty mad replacing them again afterwards.Do yours have the multiple "nubs" on the top or the continuous ridge? I noticed there was a change of design in between.

So your tailshaft did not vibrate before the front end rebuild? Thats really strange.

With the laser pionter you used, remember there is an angle difference between the front and rear box, so you will never get vertical alinement. There should be an 8 degree total differnce there.

On the subject, the diagram below. How do individuals read this? Both unis at 4 degrees working angle with a 1 degree variance?

Or

The front diff 1degree higher in the chassis, with both boxes at 4 degrees relitive to that 1 degree? Meaning that the front has a 3 degree working angle while the rear has a 5 degree angle?

A matter of perception right? 

Nils



On Sun, 15 Oct 2017 at 11:56 PM, Roger Bayley gullyraker53@gmail.com [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

I'm wrestling the same problems after a complete front-end rebuild that included replacing the front diff mounts with powerflex poly bushes.

I replaced and centred the uni joints, checked the bushes (nice and tight), checked the axial  runout at both flanges and at the centre of the shaft with a dial indicator (within spec at .002"), replaced the rear transmission mounts as well, laser-aligned the whole caboodle, tried the tailshaft in the 16 different positions allowed by the bolt pattern, but vibration still exists at 75-80 kmh. Disappears when shaft removed.

I made up a laser pointer that attaches to the output/input flanges of the transaxle and front diff, discovering that although it is possible to align them along the longitudinal axis, they are impossible to align on a vertical axis without serious re-engineering. Shimming the front diff mounts improved the issue a bit, and I will replace the tailshaft again over the next few days to see if it works.

If not, the next step is to have the tailshaft re-balanced or have a new one manufactured. 

Balancing a used tailshaft seems like a temporary fix so a new one looks tempting, especially if it uses uni joints that are readily available.

Yes, the poly-bushes do transmit more noise. I am tempted to put the old rubber ones back in to see if that resolves the vibration problem, but I didn't think too mark them for orientation before removing them.

I have seen on U-Tube that an NVH meter allied with a strobe light can be used for on-car balancing (on the hoist) at the road speed where vibration is known to be a problem - a big improvement over balancing on the bench at a maximum 1000 rpm, which does not reflect the real-world. The tailshaft spins much faster than that at highway speeds. Simple screw-on hose clamps are used for balance weights.

Uwe, I would be interested to know who made up your tailshaft. Does it use commonly available uni joints? Are they greasable, or sealed-for-life? Sliding yoke?

Roger.
8
The uni is Hardy Spicer part # K5 A7 67
9
Phill to the rescue!

Been scratching my head as to the right one (so many to choose from )

Cheers !

Nils


On Mon, 16 Oct 2017 at 8:12 AM, plander@optusnet.com.au [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

The uni is Hardy Spicer part # K5 A7 67

10
Wait till you see the price!!! Greg

Sent from Greg's iPhone

On 16 Oct 2017, at 9:44 am, Nils Birkmann nilsbirkmann@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

 

Phill to the rescue!


Been scratching my head as to the right one (so many to choose from )

Cheers !

Nils


On Mon, 16 Oct 2017 at 8:12 AM, plander@optusnet.com.au [Syncro_T3_Australia]
 

The uni is Hardy Spicer part # K5 A7 67

11
Nils, my powerflex bushings are yellow with nubs. There was no noticeable vibration before the front end rebuild, so it seems that I changed relationship between front and rear when I fitted the new mounts.

The unis are still in good nick after being replaced about 7 years ago with the 'agricultural' Hardy Spicer K5 A590.

When I enquired a month ago, the genuine part (VW 251 521 000) was not available, nor was the

Hardy Spicer K5-A767. These have a 27mm diameter cap with a 69.8mm cross (cap to cap).

The K5-A590 is designed for agricultural PTO shafts, and has a 70 mm cross. It is cheap and readily available and fits well with the circlips provided.
After dismantling the uni, slip a 26.5 mm rod through the 'ears' to check that they are not bent. (backyard mechanics with big hammers need not apply). I used a piece of 1" pipe which was close enough to eyeball for straightness. Slip a feeler gauge in to see if clearance is identical all round.
Circlip grooves need to be cleaned scrupulously.
The kit comes with 2 pairs of circlips in two thicknesses, both thinner than the VW circlips. Centralise the unit with a depth gauge or dial gauge. I found the original VW circlips gave the best result for me. Factory unis are often fitted with shims behind the circlips which can be re-used if needed.

The unis are currently available for about $45 each but there is talk that Hardy Spicer may soon cease manufacturing the 500 series. Something to do with inability to compete with cheap imports.

Bare Co. makes an identical product, A311 cross kit. I haven't seen or used them, so cannot comment on the quality.
Roger.






12
Hi Roger, the uni's are sealed and commonly available as are the flanges to make the shaft.
13
Hi everyone.

I haven’t been in on this drivetrain vibrations discussion, but suddenly thought of something that may help.

The Bergmeister is a 1982 T3 window van which I converted to an almost GL Caravelle.
It also has for the last 130,000 Ks been running a 3.6 Porsche engine and G50 gearbox.  
The engine producing three times the power of the original air cooled 2 litre motor.

It still runs stock drive shafts with stock fastenings for the CVs.
The only precaution we take is to replace the CV bolts periodically.

My point:  The stock parts, including the CVs in out T3s are very strong and have caused us no concern.

Hope this helps.

Peter






On 16 Oct 2017, at 10:14 PM, 911jack@gmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:



Hi Roger, the uni's are sealed and commonly available as are the flanges to make the shaft. 

<shaftfront.jpg><shaftrear.jpg>

14
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


15
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]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

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


16
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)
To: Syncro_T3_Australia@yahoogroups.com, Syncro_T3_Australia@yahoogroups.com
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]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

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


17
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]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

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)
To: Syncro_T3_Australia@yahoogroups.com, Syncro_T3_Australia@yahoogroups.com
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]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

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


18
Sounds like the ears are bent to me. That will cause the grease leak. They really are made of butter! Greg 

Sent from Greg's iPhone

On 19 Oct 2017, at 5:44 am, Nils Birkmann nilsbirkmann@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

 

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


19

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

 

20
Interesting,  I will raise that concern. 

Thanks Greg


On Thu, 19 Oct 2017 at 6:39 AM, gregespo73@yahoo.com [Syncro_T3_Australia]
<Syncro_T3_Australia@yahoogroups.com> wrote:
 

Sounds like the ears are bent to me. That will cause the grease leak. They really are made of butter! Greg 

Sent from Greg's iPhone

On 19 Oct 2017, at 5:44 am, Nils Birkmann nilsbirkmann@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

 

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