[urq] [Bulk] Mating 4k tranny to 3b motor

[Bares, Vittorio]

Merci! And thanks to Steve as well.

That's what I suspected. I should have gone to ETKA first...
It shows that the bearing for the MC motor (1991 200) is the same as the
4k.

Just put a caliper on the input shaft to the transmission - indeed it is
18mm. So 16mm is the depth - is 24mm the O.D. of the casing?

Vittorio -

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]
On Behalf Of Louis-Alain Richard
Sent: Wednesday, June 17, 2009 10:13 AM
To: 'urq'; 'quattro'
Cc: urq at audifans.com
Subject: RE: [Bulk] Mating 4k tranny to 3b motor

Vittorio,

Steeve is right. 

4k pilot bearing : 
046 105 313D, 
C18 x 24 x16

3B and upgrade for other engines (see service bulletin 1-70 from
2/1991):
034 105 313A
BK15 x 24 x 26

So the 3B pilot is probably 3mm smaller and 10 mm longer, hence your
insertion problems.

Time to destroy that brand new pilot bearing and install a proper one.
Hope
it wasn't too expensive...

Louis-Alain


-----Message d'origine-----

... no direct BTDT on the swap you are doing, but I had a similar issue
when
doing a clutch on a 4kQ.  A parts desk clerk convinced me that a
particular
pilot bearing was a sealed cross reference to the open 4kQ part I poked
the
new bearing into the crank and couldn't get the transmission to engage
the
engine on reinstall ... this improved bearing was not a cross for the
4kQ
... 

The lesson I learned, and what I recommend to you is that you get a 4kQ
pilot bearing and test fit it to the pilot shaft on the tranny ... and
then
see if it fits the crankshaft on your engine ... I'm pretty sure you
will
find that it does.  

Steve Buchholz

-----Original Message-----

After struggling w/the 3b pilot bearing - finally getting it out and
putting the new 3B pilot bearing back into the motor - it seems that the
4k tranny input shaft is much larger than what the stock 3B motor is
expecting.

I believe I need to re-remove the 3B pilot bearing and install the 4k
pilot bearing into the 3b motor - will that work?


_______________________________________________
quattro mailing list
http://www.audifans.com/mailman/listinfo/quattro
http://www.audifans.com/kb/List_information