1961 Coupe Mystery squeal

[MidModCad]

Ever since I completed a full int. manifold/valve covers/accessories off rehab (degrease, repaint, re-gasket) I've had an intermittent squeal coming from the engine. It begins just after the engine starts warming up - very loud - then slows to a chirp - then disappears altogether.  Sounds like a loose belt, but all are tight.  It's also louder.  Once warmed up there's no squeal... but, when I restart after even a few minutes, there it is again.  And for the first time yesterday it happened while driving.  It seems to come from everywhere, so finding the source is a challenge. A bearing somewhere maybe?  Water pump?  Any ideas appreciated.

[russ austin]

Start with the accessories. I suspect a bad bearing on the alt, water pump or power steering pump.  Take one belt off at a time.

[Eric DeVirgilis CLC# 8621]

Sounds like worn rocker shaft(s). 

https://forums.cadillaclasalleclub.org/index.php?topic=140495.0

[MidModCad]

Don't think it's the rocker shafts as I had zero noise before the rehab.  I'll give the accessory idea a try.  The Power steering pump has bad seals and will be rebuilt this week.  Maybe a bearing there has gone south.  The water pump might be a prime culprit too. No idea how old it is.  But again, made no noises before the work.  The noise doesn't seem to be coming from the AC compressor.

[Eric DeVirgilis CLC# 8621]

Don't think it's the rocker shafts as I had zero noise before the rehab. 

Did you read the linked thread? Others reported the noise began after rebuilding the engine.

[MidModCad]

The engine wasn't rebuilt.  All I did was pull the intake, valve covers and accessories.  So the accessories seem like the most likely place to look.

[Bwt]

Try a mechanics stethoscope. They are inexpensive and will allow you to place the probe on the accessory to isolate the noise.