high pitch screech

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Oct 29, 2004 | 02:26 PM

ford390gashog

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From: Brentwood,CA

high pitch screech

there is a high pitch screech coming from the engine on my 390 what could this be the engine has plenty of oil pressure 78 psi and it turns freely what is it i was told it could be from running the wrong oil two thick i am running 20w50

Oct 29, 2004 | 03:57 PM

Scouder

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Depends on the temp where you live. Fill us in.

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Oct 29, 2004 | 05:20 PM

ford390gashog

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it is about 70 the screech is enough to break my heart right now

Oct 29, 2004 | 05:46 PM

debestuss

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Did you take your belts off to see if it stopped? If it's the oil being too thick, you would think it would stop after the oil thinned out.

Oct 29, 2004 | 06:27 PM

Scouder

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From: Evanston, WY

If it's 70 degrees it ain't the oil. I would guess it's time to change to a lighter oil when it gets down around freezing.

Give us more info. Does it happen all the time? Is it louder at any time? Take you belts off and see if it goes away. If it does, determinewhich belt made the noise.

-Scouder

Oct 29, 2004 | 06:38 PM

ford390gashog

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this was the first time i fired the engine since rebuild i started it today the noise was present and it went silent after a few seconds what was this

Oct 29, 2004 | 07:10 PM

Scouder

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From: Evanston, WY

If it only lasted for a few seconds it was probably a loose belt.

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Oct 29, 2004 | 07:32 PM

ford390gashog

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From: Brentwood,CA

how does the bypass work and would it make that kind of noise

Oct 29, 2004 | 07:34 PM

#10

rusty70f100

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From: Iowa

Read my post in the "sound" thread.

Oct 29, 2004 | 07:35 PM

#11

ford390gashog

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From: Brentwood,CA

Quote:

Originally Posted by rusty70f100

Read my post in the "sound" thread.

Thank you I read it very helpful thanks

Oct 29, 2004 | 07:36 PM

#12

ford390gashog

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From: Brentwood,CA

if one of the valve trains are not getting oil to them could this cause the high pitched screech

Oct 29, 2004 | 09:34 PM

#13

ford390gashog

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From: Brentwood,CA

could this sound be a bearing

Oct 29, 2004 | 10:17 PM

#14

krewat

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From: Long Island USA

Quote:

Originally Posted by ford390gashog

this was the first time i fired the engine since rebuild i started it today the noise was present and it went silent after a few seconds what was this

Sounds like the alternator belt is loose, and the battery is a little low after all this time. First startup, the belt shreeks for a few seconds.

Not to worry. I know of no "shreek" sound that goes away in a few seconds that could be bearing/piston/cam/valvetrain related.

Describe it a little more/better and we'll see what you got.

artk.

Oct 29, 2004 | 11:48 PM

#15

ford390gashog

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From: Brentwood,CA

i ran it with all the belts unhooked to see if it went away and it did not so i am at a total loss now the sound is back and little louder it sounds like metal on metal

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