unusual squealing in engine when cold
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1st Gear
Joined: Dec 2022
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unusual squealing in engine when cold
Hello, I've got a 78 F350 camper special with the 460 big block, whenever its cold the engine will make a squealing sound that will go away for a few seconds when accelerating but comes back right before the transmission shifts gears, or downshifts. I've checked all the belts and pulleys, and they are all in good working order. Has anyone had this issue or have any suggestions on what could be the cause?
Hotshot
Joined: Feb 2004
Posts: 10,762
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From: The Shenandoah Valley
Reads like changes in engine speed brings on squealing, so look at .... belts. Try spraying them with belt dressing to see if it changes. Loose can cause it as can wear. Belts grip on the sides. If they wear until they hit bottum in the pulley, they'll stop gripping.
Cargo Master
Joined: Oct 2011
Posts: 2,238
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From: Kenner,La.
Squealing
First remove all the belts and start it up. If no noise then start putting them on one at a time and start the engine. Also replace each belt with e new one.
2Xs on the belt dressing also, not good.
2Xs on the belt dressing also, not good.
Hotshot
Joined: Feb 2004
Posts: 10,762
Likes: 2,590
From: The Shenandoah Valley
A pulley had a bent side or "ding" in it grabbing the belt and the popping was the release like if you pop a towel. I've never ever had issue with belt dressing if pulleys were good, but at best it was a temporary thing until I got new belts.
Laughing Gas
Joined: Nov 2013
Posts: 1,207
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From: S.E. Louisiana;so far USA
Hello, I've got a 78 F350 camper special with the 460 big block, whenever its cold the engine will make a squealing sound that will go away for a few seconds when accelerating but comes back right before the transmission shifts gears, or downshifts. I've checked all the belts and pulleys, and they are all in good working order. Has anyone had this issue or have any suggestions on what could be the cause?
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Tuned
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I would bet that you sir are correct!
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On our trucks with so many awkward belt positions the first thing I would do upon starting it cold and experiencing the squeal would be to spray a bit of water on the belts with the hose.
Doesn’t hurt anything, dries out fairly quickly, and will immediately show you if it’s a belt issue.
If the sound immediately goes away, it’s an external belt issue.
You didn’t happen to put a more powerful alternator on in the recent past, did you?
Doesn’t hurt anything, dries out fairly quickly, and will immediately show you if it’s a belt issue.
If the sound immediately goes away, it’s an external belt issue.
You didn’t happen to put a more powerful alternator on in the recent past, did you?
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