[urq] NAC : CV joint rebuilt...

[Frank de Kat]

Hello Louis-Alain:

A quick question:

When the unit was 'reassembled', did it still 'flex' properly?

I ask, as after a *very* late night  Audi adventure, I managed to  
reassemble an Audi UJ wrong, and didn't notice until I got it back on  
the car. I had managed to get the center section 'flipped over' on   
the splined shaft.
(And as Scott says, it either goes back right, or it doesn't!)

You can't really go wrong 'indexing' the parts, as I can't see how  
changing their position relative to each (angularly) other could  
matter very much. They are high  precision bits.

Not totally clear from your description,  but  If you did  get the  
middle part that goes on the splined shaft 'flipped over' when  
reassembling (and it Can be done!), the joint doesn't work properly,  
and flexes lite (if at all), giving no "CV joint" action.

(In other words, if you had the center part that goes on the spline,  
reversed to how it came apart, relative to the part with the 6 bolts)

You couldn't get away with that on a drive axel, but if it were on a  
very straight driveshaft, it may have gone back wrong without being  
noticed,  and the  not getting any "CV" action could cause vibration..

(Having been burnt once,  now when I re-grease CV joints, I *always*  
pay attention to how the center section is oriented when taking apart,  
and always test after reassembly..)

Regards,

=Frank de Kat=


Quoting urq-request at audifans.com:
>
> Message: 1
> Date: Fri, 22 May 2015 17:49:32 -0400
> From: <laraa at sympatico.ca>
> To: <urq at audifans.com>,	<quattro at audifans.com>
> Subject: [urq] NAC : CV joint rebuilt...
> Message-ID: <BLU436-SMTP769A2066FAAA429DB84BF9CEC00 at phx.gbl>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi everyone,
>
>
>
> Ex-urq owner still needing your fountain of knowledge about a 6-ball cv
> joint on a Saab propeller shaft.
>
>
>
> In short, I had to remove the propshaft from the car to get access for
> another job. The "while in there" jobs included repacking the rear CV joint
> with fresh grease. Just to be sure everything was clean, I removed the joint
> from the shaft, without taking pictures beforehand. Silly me.
>
>
>
> After inspection, when the parts were clean, I found 3 little white paint
> dots on each part (inner race, cage, outer race). I thought these were
> necessary to align everything when rebuilding. That's what I did. I also
> realigned the completed CV joint with the splined shaft, because I took care
> of marking the CV boot and the outer race before dismantling.
>
>
>
> And now, the driveshaft vibrates at 15 mph and again at 50 mph. I must have
> done something wrong.
>
>
>
> Does anyone here have a few tips about rebuilding these ?
>
> Where do the paint marks goes ? Inside (cv boot) or outside (end cap) ?
>
> Do they go all on the same side of the assembled joint ? (I think.)
>
>
>
> I am puzzled because I found the PDF catalogue for that NTN LJ 75 joint here
> (that's Lincoln Jaguar 75) at page 19:
> http://www.diago.sk/diagowebsite/files/cvj-forautomobile_en.pdf
>
>
>
> On the drawing, I can see the cage has a bevel which goes inside.
>
> The inner cage has a lip which goes outside toward the circlip.
>
> The outer cage has a machined surface that goes outside as a recess to
> accept the end cap. (as on the photo lower on the page)
>
>
>
> If I do all that, then the 3 paint dots are not on the same side of the
> joint, hence my confusion.
>
>
>
> It's not an Audi, it's a Saab, but at least the 6 bolts that hold that rear
> CV joint to the diff are from Audi, since Saab is MIA here in Montreal. I
> did my usual auto-archeologist stuff to bypass a problem with parts supply.
> I remembered that the urQ had similar bolts, so a quick stop at an Audi
> dealer provided me the almost correct (3 mm longer) bolts for the Saab.
>
>
>
> So, anyone has a clue ?
>
>
>
> Thanks in advance !
>
>
>
> Louis-Alain