Gearbox pinion shaft bearing replacement...

[Jim Dupree]

This is still a common method of set up for common American iron (and maybe
others) rear ends. The gears in these are cut different and do not have the
same wiping action that the 'gleason' cut gears used in Audi (VW & Porsche)
transaxles. (gleason gears are why the trans requires GL4 or GL5 spec gear
oil) Because in a transaxle the input shaft and the pinion shaft both have
to go into the differential housing the pinion gear has to be offset (higher
or lower) and the gears have to be cut different than a 'standard' rear ring
& pinion set up.
Can it be used to set up a transaxle such as the Audi? Quite possibly, but
like many things that are done in the automotive trade there might be a
learning curve that covered several transaxles and many miles before you
learned wither it worked or not. The guys I know that have used the blueing
on the gears  tell me that it is very simple and of course don't understand
why anyone would do anything else. They also well tell you that you just
look at the pattern and adjust it until the pattern looks right. Without
experience how would I know if it looked right? With the tool I can measure
it and see if the dimension is right or not.
If I was without the proper tools and could not pay to have the trans done
for me,  I would;
A) Find someone that would loan/rent the tool to me
B) Find someone I could pay to just measure the pinion set up
C) Assemble with new bearings and go with it
Would I use the blueing and pattern method? No, it would not tell me
anything.
Take care
Jim
1993 S4
1985 5kt
1984 4kq (sold)
1985 4kq (sold)


----- Original Message ----- 
From: "Fred Munro" <munrof at sympatico.ca>
To: "Eric Sanborn" <eric_audi.ql at mindspring.com>; "Jim Dupree"
<jdupree914 at sbcglobal.net>
Cc: "Audi Quattro" <quattro at audifans.com>
Sent: Wednesday, August 04, 2004 4:43 AM
Subject: RE: Gearbox pinion shaft bearing replacement...


> Eric;
>
> This is the traditional method used to set up differential pinion/ring
> gears. You paint machinists blue on one gear, assemble it, and turn the
> gears. You are looking for the contact patch right in the centre of the
ring
> gear teeth. Shims are used as required to get the contact patch where you
> want it. Some of the old (I'm thinking 1950's) Motor manuals had a
write-up
> on this procedure - I first came across it looking through some of the old
> manuals.
>
> Fred Munro
>
>
> -----Original Message-----
> From: quattro-bounces at audifans.com
> [mailto:quattro-bounces at audifans.com]On Behalf Of Eric Sanborn
> Sent: August 4, 2004 6:56 AM
> To: Jim Dupree
> Cc: Audi Quattro
> Subject: Re: Gearbox pinion shaft bearing replacement...
>
>
> Jim Dupree wrote:
>
> >The tools to measure
> >the back lash can be improvised but I don't know how one would improvise
> the
> >pinion depth measurement tools.
> >
> >
> The company I work for has a sister plant in Germany that makes spiral
> bevel and helical gearboxes.  Our guys in the shop occationally do
> repair work on the units.  They use a marking grease to see the
> engagement depth.  You paint it on one side and then run the gears
> against each other by hand.  Then you look at the pattern the grease
> makes and review the charts to you can tell which direction things need
> to be shimmed.  This is done in connnection with measuring backlash.
>
> Jim do you think this would work for us shade tree guys with less
equipment?
>
> --
> Eric Sanborn
> '85 4ktq
>
> http://sofadog.net/4ktq/
>
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