squeal from underhood - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 11-23-2009, 04:41 PM Thread Starter
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squeal from underhood

Well, I replaced my tensioner last week and noise went away for a few days. Got home from out of town this weekend and fire the truck up to a nice loud new noise from under the hood. I am kinda thinking it is the idler pulley but not 100% yet. The noise is loud while going through the gears but goes away once you put it in nuetral. I no it is either belt or a pulley somewhere due to going away once I spray some wd40 on her. Just wierd that it gets louder with acceleration and does not make the noise at idle.
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post #2 of 16 Old 11-23-2009, 05:22 PM
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I had the same problem recently and found out that some of the belts out there were actually not the right width. I replaced mine with a new gates and it went away instantly. I had changed all the idler pulley bearings first since that is what it sounded like. Good luck.

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post #3 of 16 Old 11-23-2009, 05:28 PM Thread Starter
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you can just change out the bearing in the idler pulley? No clue how old the belt it on my truck but it isn't cracked or missing any ribs. Prob still gonna change it out though.
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post #4 of 16 Old 11-23-2009, 05:48 PM
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Is it normal for belts to squeal when I start it up in the morning and go away once its warmed up?

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post #5 of 16 Old 11-23-2009, 06:02 PM
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You can change just the bearing. I bought mine at the electric motor shop. They just pop out and in. Use a socket the same size. As far as a squel when cold, I would think it is a indication of bad belt or improper tension. Or possibly a dry bearing. Just have to look at it.

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post #6 of 16 Old 11-23-2009, 06:25 PM
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you can buy the pulley for $26 at autozone. just picked 1 up for me today



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post #7 of 16 Old 11-24-2009, 03:16 AM Thread Starter
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sweet, thanks guys!
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post #8 of 16 Old 11-24-2009, 03:34 AM
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The easiest way to find the source of the noise is to take a wooden dowel, or wood handle and place it around different places of the engine. You can actually feel the noise through the wood. Old, Old mechanics trick.

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post #9 of 16 Old 11-25-2009, 05:54 AM Thread Starter
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anyone know where to get alternator pulley? thought it was the idler but changed that out and still have the noise. I can push on the pulley and sounds like the alternator making some squeaking.
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post #10 of 16 Old 11-25-2009, 06:17 AM
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Quote:
Originally Posted by joeniel View Post
Is it normal for belts to squeal when I start it up in the morning and go away once its warmed up?
Check your belt, it migth be cracked and hardened

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