need part # for 88 90q center support bearing

[SJ]

> Message: 2
> Reply-To: <sutul at telusplanet.net>
> From: "Dr. Ian McArthur" <sutul at telusplanet.net>
> To: <quattro at audifans.com>
> Subject: RE: '88 90Q Center support bearing - %$(@%@_*!!!!
> Date: Sun, 9 Mar 2003 10:12:46 -0700
>
> We have four 5TQs and have just done a driveshaft centre bearing.  It cost
> about $250 Canadian (that's 12 dollars US :<)
>
> The centre bearing and rubber support were replaced with a BMW piece.  The
> driveshaft does come apart and the replacement bearing works just fine.

I recently purchased a center support bearing by Mercedes Benz P/n 123 410
10 81. This part is made by Weyle of Germany. There is a part number cast
into the bearing support ring - Meyle 014 041 0045
The bearing is also an MB part made by Weyle of Germany P/N 014 098 0017.

I think both parts cost me about $50 . . . I dont have the bill to check
against.

Now the bracket from MB isn't the same as the Audi bracket. But, it looks
like that audi bearing support is only welded in two spots to its bracket.
It looks like it may be possible to grind/drill off the welds. Then, place
the old
bracket on top of the MB bracket(plenty of room and diameters are close),
and tack weld it in two spots. Voila!  Its done.

I'm not sure if the MB flanges will interfere with anything . . they may
have to be ground off.

Best of all, you dont need any skilled labor to do it. The hardest part is
the welding . . but, two spot welds should'nt cost that much. Actually, you
might be able to epoxy the MB bracket to the Audi bracket. Some super duper
epoxy might work. Kind of risky . .if it lets go, the drive shaft will flop
around there . . .you wont be able to drive. There is enough room on the
brackets to think up of some mechanical fastening system if you cant get to
a welder.

Mind you, I havent tried this out yet. But, it sure looks feasible when
looking at the parts on my desk.

>
> I do not know the details of how it was done as we farmed it out to a firm
> in Edmonton, Alberta.
>
> The replacement centre bearing did not have the correct steel mounting
> bracket so the repair entailed welding the bottom part of the original
Audi
> bracket on to the BMW piece.  It fit perfectly and has no vibration.
>
> We manufactured a jig from a commercial steel 2X4 building stud (from a
home
> supply depot) to align the driveshaft.  I think this is critical.


To align the drive shaft, use a string. Tie one end of the string to front
 cv joint, the other end to rear cv joint. Make it snug. The string will lie
 along the drive shaft.

 Make some "guages". Get a wood square molding, 1"X1". Cut off 3 pieces
about
an 1.5" long. Place the three pieces next to each other on a flat surface
and make sure the tops are all even with each other. If not, grab all three
pieces together as one unit, flip them and sand the other side on a sheet of
fine sandpaper laying on a flat surface until all surfaces are even. Now you
have 3 identical measurement blocks.

Slip one block under the string at the front cv joint. Slip second block
under the
string at rear cv joint. Use the third block as a feeler guage under the
string at the center support.
Adjust center support up or down till that third block just kisses the
string.
Do the same for side to side alignment.

This is a lot simpler and cheaper than trying to make/use the alignment tool
that the Bentley shows. And if you use a smooth string, you can set the
driveshaft straight to + - .020"   . . . . good enough for me.

SJ
85 Dodge PU, D-250, 318, auto
85 4k - - sold but still on the road
88 5kq
90 100q

===============================

no1of consequence iin10ded at hotmail.com
Tue, 15 Jul 2003 20:21:57 +0000

hey all,

so the clicking noice from the rear o' me quattro i think has something to
do with the torn rubber of the center support bearing, likely causing the
propshaft to clunk against the car. the end cv's felt pretty good play-wise.

anyone know what the bmw part number is that fits this app? rod at tpc
doesnt have it handy + isnt sure which fits which. 2bennett has the part but
its $150. i cant imagine the bmw part is that much.

ill be sure to stick this in the ol knowledge base if + when someone has it.

thanks up front.

jim