Squealing is driving me crazy!!
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New User
Joined: Jan 2010
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Squealing is driving me crazy!!
I have a 1995 F150 XLT with the 5.0L 302 and there is a squealing coming from the engine that sounds just like a belt squeal. I replaced the belt tensioner and the belt and it still squeals. It just started this winter and usually only does it when the truck warms up. Any ideas??
Senior User
Joined: Jul 2009
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From: Sesser Il
Mine is doing the same thing, from best I can tell it is either the smog pump, idler or tensioner on the passenger side. Could be the alternator, but sounds lower. Hope you find the problem, as it sure can be annoying.
Senior User
Joined: May 2009
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you need to get the most expensive belt you can find the one with the rib things on the back..also one time my smog pump seized and was squealing so bad i was going 100 the whole way home on the freeway cuz i just put a new smog pump that was siezing (spinning slower then the belt but still spinning?) and causing a squeal
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Postmaster
Joined: Jan 2009
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Check all your accessory pulleys , sounds like something is getting ready to seiz up , could be the air pump ?? Goodyear gatorback is a good belt....Lew
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Joined: Oct 2007
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From: Foster, RI
I had a similar problem, only mine would squeal like a pig until it warmed up and it only happened when it was cold <40º. It ended up being the tensioner pulley for the serpentine belt. I invested in a mechanics stethescope to track down the problem.
New User
Joined: Jan 2010
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I'd check out all the bearings in your accessories if you have taken care of the belt. If it only does it when it's warming up, that could mean that a bearing somewhere needs to warm up and, through thermal expansion of the bearing material, it stops squealing when the worn bearing expands just enough and the slop becomes less. This might be a blessing in disguise, indicating a bigger problem before it happens!
as some of the other members mentioned, check out the bearings by trying to listen to each one individually somehow.
Good luck!
as some of the other members mentioned, check out the bearings by trying to listen to each one individually somehow.
Good luck!
Senior User
Joined: Mar 2005
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From: Powhatan, Virginia
CHECK PULLEY ALIGNMENT
I have a '92 F150 4.9l....When I replaced the power steering pump pulley i did not press it on quite far enough and the belt would squeal like a pig in heat. This was only a 16th of an inch or so out of alignment. The squeal was coming from the tensioner pulley. I pressed the pulley on a bit further and the squeal was gone for good. I tried belt dressing first but that only made a big a$$ mess.
Hotshot
Joined: Sep 2001
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I like Goodyear Gatorback and Dayco Polycog belts.
A mechanices stethoscope may be your best friend for this. I have this one and its not expensive.
Stay away from belt dressings.
Automotive Stethoscope - JCWhitney
A mechanices stethoscope may be your best friend for this. I have this one and its not expensive.
Stay away from belt dressings.
Automotive Stethoscope - JCWhitney
Senior User
Joined: Jul 2009
Posts: 154
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From: Sesser Il
Well I went to the local salvage yard on the weekend and found me a smog pump, and changed it out, but the squealing is still there. Well even though the pump wasn't the squealer, it was rattling inside pretty good. Guess I will work my way up through the idlers and save the alternator for last. Just to try to save a few bucks, is it possible just to change out the bearing in an idler? Has anyone tried it?