Does this sound right?
Thread Starter
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Cross-Country
Joined: Aug 2023
Posts: 84
Likes: 46
Does this sound right?
Hey guys. 1st diesel, a 2000 F250 7.3 with 126,000 miles. The video here shows a noise, but I think I've determined this is just normal belt sound. I loosened the belt, gave the pulleys a spin and it's not those bearings. The belt looks to be in great shape. So I guess I'll live with it. It just seems loud ... like you hear hear it a distance from the truck. Just wanted to get the forum's opinion on this. Here's the link:
https://youtube.com/shorts/AT3xgeWm3Wk?si=tBc0_RevzkK070RG
https://youtube.com/shorts/AT3xgeWm3Wk?si=tBc0_RevzkK070RG
Laughing Gas
Joined: Jun 2013
Posts: 1,098
Likes: 514
From: Yokosuka Japan
Hey guys. 1st diesel, a 2000 F250 7.3 with 126,000 miles. The video here shows a noise, but I think I've determined this is just normal belt sound. I loosened the belt, gave the pulleys a spin and it's not those bearings. The belt looks to be in great shape. So I guess I'll live with it. It just seems loud ... like you hear hear it a distance from the truck. Just wanted to get the forum's opinion on this. Here's the link:
https://youtube.com/shorts/AT3xgeWm3...c0_RevzkK070RG
https://youtube.com/shorts/AT3xgeWm3...c0_RevzkK070RG
Cargo Master
Joined: Apr 2012
Posts: 2,029
Likes: 531
From: Bottom Of Pikes Peak
Sounds like a bearing failing...alt or possibly the ac pump but it could be something else. Definitely sounds like a bad bearing to me though. I'm pretty sure that's not normal but now you have me wondering...i'll have to go fire mine up
Cargo Master
Joined: Apr 2012
Posts: 2,029
Likes: 531
From: Bottom Of Pikes Peak
that, light squealing noise is definitely not normal...I just went and fired mine up. It's most likely a failing bearing. You will have to pinpoint it like josh mentioned. You may also be able to take the belt off and spin the other items you missed and see if you can feel anything. I'm guessing if the belt is off, then the noise goes away
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Laughing Gas
Joined: Jun 2013
Posts: 1,098
Likes: 514
From: Yokosuka Japan
i have done that before..... trying to listen to a belt fed emissions pump on a rotary...snatched the stethoscope right out of my hands and off my ears...
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Brett Foote
Lead Driver
Joined: Jul 2003
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From: Wheatland, Mo
I am thinking either idler pulley or tensioner. Remove the belt and give those a fast spin. Even by hand you may be able to hear something. Both are cheap and easy to replace.
Check the others with the belt off as well. AC pump, alternator... check for in and out play on the pulleys as well.
Check the others with the belt off as well. AC pump, alternator... check for in and out play on the pulleys as well.
Lead Driver
Joined: Jul 2017
Posts: 6,861
Likes: 2,335
From: WV
Originally Posted by aawlberninf350
Could rub the belt lightly with a candle or soap (engine off ofc) and see if the sound changes.
But I’m not gonna be responsible for accidents by telling people how it’s done at my house.
Banned
Joined: Dec 2018
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Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
[QUOTE=Brandonpdx;21446569]Spray some water on the smooth side of the belt and see if it goes away./QUOTE]
^^^^ This. And take a good, long look at the tensioner and other pulleys to make sure they're well aligned.
^^^^ This. And take a good, long look at the tensioner and other pulleys to make sure they're well aligned.
Thread Starter
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Cross-Country
Joined: Aug 2023
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What does water on the smooth side of the belt do?
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
Pulley wear and misalignment can make the belt chirp on the smooth side as the belt gets slightly deflected then "skates" back into alignment. If wetting the belt stops it, check the pulleys to make sure they're all parallel to each other.