engine "chirping" at 190 degrees - Team Camaro Tech
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post #1 of 8 (permalink) Old Jun 3rd, 11, 02:15 PM Thread Starter
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Tony W
 
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Question engine "chirping" at 190 degrees

Need help diagnosing an intermittent "chirping" noise on my 69 350.
Noise occurs after the engine has warmed to 190 degrees and occurs when the belts are off. Engine is a recent rebuild (under 500 miles). No metal in the filter that I can see. The noise begins after driving the car about 10 minutes. Oil is fresh. Engine rebuild included comp cam, hypereutic pistons and has 4 boltmains. Thanks for any ideas as to the possible sources of the noise
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post #2 of 8 (permalink) Old Jun 3rd, 11, 02:51 PM
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Todd
 
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Re: engine "chirping" at 190 degrees

I'd check for anything loose around the engine compartment and you may want to pull the valve covers and have a look for anything loose or rubbing. Make sure it's oiling up top.
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post #3 of 8 (permalink) Old Jun 3rd, 11, 04:17 PM
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John
 
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Wink Re: engine "chirping" at 190 degrees

One of the most important things to do would be to be sure you can tell what area the sound is actually coming from.

I agree with pulling the covers and taking a good look at the Rockers and Pivot Balls to be sure they are oiling correctly.
Common issue if the original pushrods are re-used and not checked for debris plugging them after cleaning them ...
Another cause of low oil flow to top-end could be a bad or weak lifter.

One other common area for a sound of this type if it sounds like it's comming from below could be the Flex Plate, if this is an automatic trans.
An unnoticed crack in the plate if it was the original may have continued to the point it is making the noise audible now - I've run into this on a couple engines over the years.

I've even had an old points distributor make a 'screaching' noise many years ago.
The upper bushing was bone dry ...

1968 Convertible
Some trucks
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post #4 of 8 (permalink) Old Jun 3rd, 11, 04:21 PM
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Re: engine "chirping" at 190 degrees

Pull the PVC valve out while it's chirping to see if that's it.

Ron
The
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An exercise in interchangeability on a Well optioned 67 SS 350 vert.
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post #5 of 8 (permalink) Old Jun 4th, 11, 10:28 AM Thread Starter
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Tony W
 
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Re: engine "chirping" at 190 degrees

Thanks for the advice. Will follow through with checking to see if the oil is reaching the top the heads. Will check the flex plate too-though not sure what effect the engine temperature would have on the flex-plate. (the sound chirp/squeal only occurs when the engine is hot)

Ace
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post #6 of 8 (permalink) Old Jun 4th, 11, 10:42 AM
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Steve
 
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Re: engine "chirping" at 190 degrees

Quote:
Originally Posted by anthony wren View Post
Will check the flex plate too-though not sure what effect the engine temperature would have on the flex-plate. (the sound chirp/squeal only occurs when the engine is hot)

Ace
Metal expands when heated and changes clearances even in cracks like you are looking for in the flex plate, and the heat from the engine will heat up the flex plate too.

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post #7 of 8 (permalink) Old Jun 4th, 11, 02:46 PM
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Re: engine "chirping" at 190 degrees

Buy an elcheapo mechanics stethoskope.

My Spelling is not incorrect...it is creative

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post #8 of 8 (permalink) Old Jun 5th, 11, 11:34 PM
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Re: engine "chirping" at 190 degrees

everybody chirp as explained is different--i would chek for loose converter bolts
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