serpintine belt squealing??? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 12-21-2009, 08:43 PM   #1 (permalink)
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serpintine belt squealing???

the belt seems to squeal a lot, even after i put belt dressing on it. Could i have some other major issue, such as a bearing going out?
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Old 12-21-2009, 09:20 PM   #2 (permalink)
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I went through a squeaking episode on mine. I changed the alternator (it squeaked even with the belt off when I turned it), the idler pulley and belt tensioner and it still squeaked. I put a new belt on it - silence.

So, unless your belt is fairly new, I'd change it. Also, take a large cardboard tube (careful with the engine moving!) and listen for the squeak an see if it comes from any of the accessories.

Good Luck!

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Old 12-21-2009, 09:28 PM   #3 (permalink)
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Same here...put belt dressing on for several weeks. Everytime I put the dressing on it'd get quite. Then would start squeaking again, later. Finally went to NAPA and got a lifetime warrantied belt. No squeak!
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Old 12-21-2009, 09:33 PM   #4 (permalink)
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Mine started squeaking while cold. Squeak was actually a tensioner bearing. New tensioner and a Goodyear Gatorback belt later - nice and QUIET!
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Old 12-21-2009, 09:38 PM   #5 (permalink)
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I am experiencing the same thing. The belt tensioner is new as is the water pump. I thought I still had a bearing problem but as soon as I put some soap on the belt it goes away but it comes back after a few minutes. I have tried belt dressing and it gets quiet but only temporarily. The belt was new so I even tried putting the old one back on and it still makes noise.
I read in another thread that people with a similar problem cured it by installing a Gates belt rather than a Motocraft or Dayco. I think that will be my next move because it is driving me crazy.
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Old 12-21-2009, 11:15 PM   #6 (permalink)
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I'm having the same problem. I can make the belt squeal stop with wd40 or belt dressing, but it always comes back. I think I'm going to try a Motorcraft belt.
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Old 12-21-2009, 11:20 PM   #7 (permalink)
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I've also read that it would be a good idea to clean the pulleys with simple green and a brush with the belt off, so you might try that before you put your new belt on. I will when my new belt comes in.
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Old 12-22-2009, 06:26 AM   #8 (permalink)
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There are two pulleys that can effect the serpentine system, (To include poor charging from the Alt.)
There is an idler, and the tensioner. Forget belt dressing, look at your belt, if there are cracks in the ribs, replace it! If that doesn't fix it. It's something else. Certain brands of belts won't squeek when brand new I am sure. I have used Gates, Goodyear, and Motorcraft.... all fine belts.
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Old 12-22-2009, 09:31 AM   #9 (permalink)
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Quote:
Originally Posted by browningbuck225 View Post
the belt seems to squeal a lot, even after i put belt dressing on it. Could i have some other major issue, such as a bearing going out?
What does the smooth side of the belt look like? If it's really shiny, you may have a pulley that rides on that surface wobbling. When you are squeaking, instead of spraying the belt, try shooting a stream (I use windex) right at the bearing area of the idlers. If it gets quiet, probably a good place to start. Also wouldn't hurt to just remove the belt and give all your pulleys a good spin and listen. It may not squeak while unloaded, but could be rough, noisy, tight, or.... falling off. Pay attention to the alternator as when the brushes start checking out, they can squeak on the commutator.
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Old 12-22-2009, 11:06 AM   #10 (permalink)
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I replaced my factory belt with one that has a "cross pattern" in the serpentine grooves. Can't remember the brand, but it stopped all of the squeal. Looks like they cut across the grooves on a 45 degree angle.
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Old 12-22-2009, 08:13 PM   #11 (permalink)
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i changed the belt today because i was pulling out of the driveway and was tired of it squealing so i went to put more dressing on it and thank the good Lord i looked at it because this time the belt was only about a 1/2" wide! it had shredded! i went and changed the belt and it silenced it, but i had to get on the road so i didnt get to check any of the pulleys. i am going to check the pulleys tomorrow before i start hauling hay. are there any specific ones i should check, such as the tensioner and idler pulleys, i know the alternator and water pump are fresh, but what concerns me the most is that i think my power steering pump may be on its way out. could this be causeing the squeeling problems? because there is a faint squeel still.
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early 1999, 7/98, F-250 7.3L, 250,000+ miles, 4x4, triple disk torque convertor, AFE dryflo home made cold air intake, straight pipe exhaust, superchips tuner (stuck on high performance tune,because someone stole the tuner out of my truck), 4.7K mod, Glow shift gauges (pyro, boost, egt), CCV mod, 3in of lift in front, 1in in back w/ 2009 SD rims w/ 2in wheel spacers wrapped in 325/65/18 Fierce Attitude MT, aftermarket headlamps w/ LED's, ranchhand grill guard, 03' front bumper w/ fog lights, gooseneck hitch

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Old 12-22-2009, 08:24 PM   #12 (permalink)
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Check your fluid in the ps pump. If it's always getting low, there is an o ring that goes between the resevoir and the actual pump. Easy to replace and much cheaper too. Also check the lines for obvious leaks but the pumps themselves are pretty good. Of course, like always, this is just IMO
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Old 12-23-2009, 07:00 PM   #13 (permalink)
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yea checked... no leaks
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early 1999, 7/98, F-250 7.3L, 250,000+ miles, 4x4, triple disk torque convertor, AFE dryflo home made cold air intake, straight pipe exhaust, superchips tuner (stuck on high performance tune,because someone stole the tuner out of my truck), 4.7K mod, Glow shift gauges (pyro, boost, egt), CCV mod, 3in of lift in front, 1in in back w/ 2009 SD rims w/ 2in wheel spacers wrapped in 325/65/18 Fierce Attitude MT, aftermarket headlamps w/ LED's, ranchhand grill guard, 03' front bumper w/ fog lights, gooseneck hitch

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Old 12-23-2009, 09:05 PM   #14 (permalink)
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the ps pump pulley bearing on on mine is going that where my squeak is coming from just another area to look
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Old 12-23-2009, 09:13 PM   #15 (permalink)
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Idler and tensioner replace both. Guarantee that will fix it.
Your tensioner may look like this after you compare it to a new one..
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