Squealing Alternator

[Robert Stirrat]

Hi Mark, A loose fan belt can certainly cause a low output from the
alternator, the squeal will be more pronounce as you switch on more
accessories.  Check the tension of your belt, it shouldn't move more than
about 2mm when you press down on it with your hand.

Do this before going down the route of checking the bearing ring.

Good luck.

-----Original Message-----
From: Mark L. Chang [mailto:mchang at ee.washington.edu]
Sent: 07 February 2002 07:05
To: quattro list; 20v list
Subject: Squealing Alternator


Once again I have a squeeeealing alternator. Low RPMS, especially after
the car is nice and warm. e.g. when I come to stop sign, voltage dips to
12v instead of 14.1v and kind of hovers there. Sometimes, it'll correct
itself and jump back up, but more so, when I rev up upon launch, it just
squeeeeeals until about 2k rpm.

Now here's the dumb question: is this the belt, or is it the bearings?
I'll have it all apart this weekend for a tbelt/h2o pump, but wanna know
if I need to get new bearings to do that too.

Mark
1991 90q20v

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