howling after T-belt job?

[ben swann]

The turkey gobble sound is likely the tensioner pully.  Hopefully you
installed a new one, but that sound is usually associated with
installing new belt without changing the tensioner.

I have found that a little lubrication of the tensioner helped on one I
had with this noise.  You may find belt dressing aimed properly may
help.  Certainly not condoning this as a "proper" fix, but who wants to
tear the front cover off again.

The NG is dynamically interference with the stock cam.  Tha means if
you turn the crank over by hand with no t-belt, it probably will not
collide with an open valve.  When running, especially at higher RPMs,
the valves start to "float" a little - it becomes interfering as the
valves tend to stay open longer.

When I installed the Elgin 270 cam into the NG for "Project GTQ" the
engine became statically interfering.  The engine could not be turned
far from its proper orientation of Crank to Cam without locking up into
a valve.

Timing belt is critical for this engine - you don't want a failure.

Pretty much the same with the MC-1 engine - dynamically interfering.

Ben

Subject: Re: Re: howling after T-belt job?
From: Marc Swanson <mswanson at sonitrol.net>
Reply-To: mswanson at sonitrol.net
To: David <duandcc_forums at cox.net>
Cc: quattro at audifans.com
Organization: Sonitrol
Date: 23 Jul 2003 11:36:35 -0400


> Huh? NG is non-interferance? Really? I head that there had been
documented cases of valve collision in a case of a broken belt. So,
what's the truth? Interferance or non-interferance...


well, I can tell you that on an NG you can take off the belt and spin
the crank or cam with no interference.  That said, if things are a bit
out of tolerance I imagine the possibility exists that you _COULD_ get
valve-piston collision.


--
-Marc
87' 4ktq
88' 90q
www.mswanson.com/audi