high pitched whistle after new turbo install

[Jim Jordan <superba@ix.netcom.com>]

Hi all,

Last week it was a rebuilt turbo that failed at less than 500 miles.  This
week, today, it's new(rebuilt) turbo installed with a high pitched whistle
sound at idle.  Disappears when RPM increases, and when engine gets hot I
think.  Could be metal on metal somewhere, also.

All normal precautions were observed;  changed oil and filters, turned
engine over for about 60 sec, 15 on 15 off, with coil grounded, idled for
about 5 to 7 minutes before driving at all.  During installation I had to
loosen the compressor housing and rotate it to line it up with the output
fitting and tube, which I did with the turbo bolted on the car.  I do not
have a stethoscope but I moved my head around in the engine compartment and
the sound level varies from place to place.  This sound wasn't present
before installing this turbo.

Any ideas?

TIA.

Cheers!

Jim Jordan