Persistent vibration, 87 5KQT

[Andrée-Anne Bourgeois]

More, a propshaft is supposed to be balanced via little weights from factory
and when rebuilding, care must taken to replace both halves exactly like
before, i.e. same relative relationship so the balancing is preserved. I'm
sure a good rebuilder knows that. Mark before dismantling, replace parts,
re-align marks and torque the bits to the proper spec.

Also, I'm sure you know that, but a proper alignment involves two axis :
up/down, and left-right. The latter is a lot more difficult to achieve
because of that center support bracket. That's why I used a piece of string
an 3 corks from our personal reserve. It worked on a Quattro, don't know if
it does on a Type 44.

Do the FWD-only test to rule out the propshaft or put the car on a lift, run
the engine up to speed and have someone watching the drivetrain from bellow.
Any vibration should be obvious.

Louis-Alain
Heading for an ice track lap day tomorrow with my old 1983 Quattro. Been my
20th time there, and still some butterflies in the stomach... Must be age.
:-)


-----Message d'origine-----
De : quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] De
la part de urq
Envoyé : 12 février 2011 19:02
À : quattro at audifans.com
Objet : RE: [Bulk] Re: Persistent vibration, 87 5KQT

If you suspect the propshaft ... since you have a car with a lockable center
diff you can pull the propshaft completely, lock the center diff and go for
a ride to see if the vibration goes away.  

As far as I know the alignment jig is intended to align the fore and aft
sections of the propshaft so the angle of the center joint is 180 degrees
(i.e. the two sections are co-linear).

Steve Buchholz