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Re: cracked 2-piece manifold for MC...

In message <37D7874E.7F6589AF@poboxes.com> Gerard writes:

> > I am slowly becoming _convinced_ that manifold cracking is largely
> > caused by failing motor mounts, especially the one directly under the
> > turbo.
> How do you figure that one?

The entire combined weight of the turbo and wastegate hangs off the
exhaust manifold.  The engine mount acts like a shock absorber.  As it
loses functionality, shocks transmitted between the frame and engine
increase in instantaneous intensity and that turbo is a large weight
on a relatively long lever.

I'm increasingly treating cracked manifolds as mere symptoms (albeit
expensive ones) of dead engine mounts.

 Phil Payne
 UK Audi quattro Owners Club
 Phone: 0385 302803   Fax: 0870 0883933