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Wastegate diagnosis

OK - this one's principally addressed to Scott and refers to web page
http://www.sjmautotechnik.com/wginst.html - but others are welcome to
chip in.

Scott's text says: "The Waste Gate Diaphragm should be inspected after
removing the Waste Gate Cap.  Look for any tears or holes in the

I have found it better to use a MityVac on the upper chamber connection
_before_ stripping the wastegate - in fact, I don't go in unless the
test fails.

Has anyone tried a simpler method?  I'm thinking that a simple water
manometer could be used - drop a foot of water or so into the hanging
loop of a polythene tube and hold it just below the level of the
wastegate.  Attach one end to the wastegate, and then lower the other
end of the tube.  Obviously the water will move a little to compensate -
but the situation with 10" of water in the leg going to the wastegate
and 2" in the open leg is interesting.  Surely a leak in the diaphragm
will lead to the legs gradually equalising?

Anyone with a known leaky diaphragm like to try this out?  Four feet of
polythene tubing is a damn site cheaper and a damn sight more portable
than a MityVac.

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