[urq] rear diff sealing

[Patrick Carlier]

For your information guys

If a rear diff  , rear bearings or inner gear(s)
are tamperted with ,  it's imperative that the entire
setup is re-shimmed .

Ring gear position , and bearing preload are important and both need to be 
accuratly set .
This is done by shimming the bearing cups on both sides .
It requires equippement that can measure position accurate down to 0.01mm .

Once the correct position is achieved  the pinion must be reshimmed to 
obtain
the correct  gear tooth backlash . This is obtained by torqing a 
compressable bushing .

Not an easy task  .
BTDT on  various rear diff's and six speed transmissions .

Pat







----- Original Message ----- 
From: "Martin Pajak" <martin at quattro.ca>
To: "'urq'" <urq at pacbell.net>; "'Ben Howell'" <bhowell at rmi.net>; "'Mike 
Sylvester'" <mike at urq20v.com>; "'urq Audifans'" <urq at audifans.com>
Sent: Sunday, February 12, 2012 2:15 PM
Subject: Re: [urq] rear diff sealing


Steve,

The torsen diff will only go into the new style 4kq diff housing.  Sorry, no
way to retain locking capability.
The good news is that the V8 diff comes with large 110mm flanges so it will
bolt into the Ur-q without issue.

Here is a writeup on MG by Justin, I did it myself and took less than 2
hours to complete the swap (including oven time).
http://www.motorgeek.com/viewtopic.php?f=6&t=10133&start=275
My swap was into a 115hp 4kq so I did not feel any difference when
completed, plan was for some more power but sold the car before I had a
chance to experiment.

HTH
Martin Pajak

http://www.quattro.ca

1982 Audi Ur-quattro, SQ project
1983 Audi 80 quattro, Euro 2-Tür
1984 Audi Ur-quattro, 20vt with 6-speed
1993 Audi 90 CS quattro, 2.5 TDI with 6-speed


-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of urq
Sent: February-12-12 2:03 AM
To: 'Ben Howell'; 'Mike Sylvester'; 'urq Audifans'
Subject: Re: [urq] rear diff sealing

... I had heard that it was originally developed for some sort of aircraft
engine application.  I had a bit of difficulty getting the first tube, and
it wasn't cheap ... it seems more plentiful and cheap now ... but it seems
that there may be more than one variety.

All I know was that I read the specs on the Permatex site ... non-hardening
and tolerant of automotive lubricants, not acidic either.  It seems to me
this would be a good alternative ... in fact I did a quick check and
confirmed that it was originally designed for Rolls-Royce aircraft engines:


http://www.hylomar.com/index.php?option=com_content&view=article&id=64&Itemi
d=138

Hylomar Universal Blue, that is what I would recommend.  As noted, it was
recommended on the

... now, I'd love to hear more about how to swap a V8Q rear Torsen into an
ury's rear pumpkin ... and whether or not there's a way I can retain the
locking dogs ...

Steve Buchholz

-----Original Message-----
From: Ben Howell
Sent: Saturday, February 11, 2012 8:32 PM
Subject: Re: [urq] rear diff sealing

My understanding of Hylomar (from my RX-7 ownership days) was that is was
developed specifically for use in o-ring sealing applications. Supposedly
Mazda was having a heck of a time getting the large o-rings in-between rotor
housing to seal and someone developed Hylomar for them and it worked like a
charm.....but only in o-ring applications.

Ben

-----Original Message-----
>From: Steve Buchholz
>Sent: Feb 11, 2012 8:21 PM
>Subject: Re: [urq] rear diff sealing
>
>The first thing that came to mind is the sealant I used for my old CB700SC
engine, called Hondabond ... I see it mentioned on the Rennlist too. This is
apparently like Permatex grey.  Then I remembered some stuff I used on the
urq long ago called Hylomar.  This stuff is non hardening and is now
supplied by Permatex too. Were I in your position, I'd go with the blue
stuff.
>
>Steve Buchholz (mobile)
>
>----- Reply message -----
>From: "Mike Sylvester"
>Date: Sat, Feb 11, 2012 11:01 am
>Subject: [urq] read diff sealing
>
>Audi uses some sort of green sealant on the side cover as there is no
>gasket.
>When you guys open it up to swap in the V8 torsen diff, do you reseal
>that with something?
>
>Mike
>

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