Need Help...high pitch squeal coming from engine.

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Jun 23, 2012 | 07:27 PM

streetknight2

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Need Help...high pitch squeal coming from engine.

My friend just bought an old chevy II with a carburated 5.3. He was driving when he started hearing a noise like an old style fan belt slipping. He knew the alternator was new, so he took the serpentine belt off, cranked it up and noise is still there. It doesn't go away, but doesn't seem to get faster or slower with rpm.

Again, this is with no accessories hooked up.

Any ideas?

Jun 23, 2012 | 08:27 PM

crainholio

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Tough call w/ no video, but it's usually a rod bearing spun. Pull the dipstick while running and look for glitter.

Jun 23, 2012 | 08:36 PM

streetknight2

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Hmm, I'll tell him to check. He said it has good oil pressure and isn't knocking or rattling. Did say it sounded like it was towards the front of the engine.

Jun 23, 2012 | 09:48 PM

MrMixnMatch

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Check your pulleys... I know it's a pretty common problem on the 93-02 vehicles... Might be the same thing there.

Sometimes you can regrease them, other times they'll need to be replaced if in bad enough shape.

Jun 23, 2012 | 09:52 PM

crainholio

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Quote:

Originally Posted by MrMixnMatch

And sometimes you can read the original post:

Quote:

...he took the serpentine belt off, cranked it up and noise is still there.

Not much pulley noise to be had w/ no belt spinning the pulleys...

Jul 18, 2012 | 12:18 PM

streetknight2

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Just wanted to update in case it helps anyone else.

It was the lack of a PCV valve. Imagine that lol. Put one in line between the valve cover and carb base and problem solved.

Jul 18, 2012 | 01:24 PM

Old Geezer

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Likely...

Quote:

Originally Posted by streetknight2

Just wanted to update in case it helps anyone else.

It was the lack of a PCV valve. Imagine that lol. Put one in line between the valve cover and carb base and problem solved.

sucking air past the ft seal....BTDT...