Squeaking from Serpentine belt, Pulleys? - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 11-05-2011, 06:15 PM   #1 (permalink)
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Squeaking from Serpentine belt, Pulleys?

I have a very annoying and consistant squeaking noise coming from my serpentine belt/pulley area. I had heard it might be an old idle pulley. when i look at it while running the tensioner is moving a bit. But i had that replaced a year ago. Any information will help. Thanks!
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Old 11-05-2011, 09:02 PM   #2 (permalink)
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How old is the belt and what brand is it....... The tensioner can wear out and will squeek if the spring is weak. Ensure the noise is not coming from the vacuum pump pulley.

If you have replaced the belt recently what length did you use???

Go to my pics under my name there should be a picture of the bolts holding the tensioner and other appliances to the engine..... there are several different bolts.

http://photos.thedieselstop.com/show...=39087&cat=500
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Old 11-07-2011, 11:32 AM   #3 (permalink)
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I just replaced my tensioner assembly and the idler pully, the tensioner was worn out and ccause the belt to track to the side a little and it sqeaked from everything to a chirp to a constant sqeal. changed them out and it is quiet as new now. total cosst was aroun $76.00 from local parts store.
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Old 11-07-2011, 02:16 PM   #4 (permalink)
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The belt is in good condition. and for some reason the squealing is most prevalent when it is cold outside.

Is it pretty easy to replace the idler pulley? my tensioner assembly is basically brand new.
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Old 11-07-2011, 02:25 PM   #5 (permalink)
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yeah it's pretty east, the bolt is the same size as the one that holds the tensioner on. if you had to replace the tensioner you would have had tp pull off teh idler pully. I know the tensioner pully(not the tensioner bolt ) loosens to the right and not the left...on the other hand the idler pully loosens to the left, like a normal bolt.

If you pull the bolt off and spin the idler pully and check it for 'walk' or movement in all directions, you should be able to tell if you need to replace it. check the other pullys on the alternator, powersteering, water pump etc.
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Old 11-07-2011, 02:39 PM   #6 (permalink)
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How much movement is too much?
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Old 11-07-2011, 03:00 PM   #7 (permalink)
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it's hard to describe, but you will be able to tell by feeling it. there should be very little to no movement.
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Old 11-07-2011, 07:48 PM   #8 (permalink)
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If you spin it and it has a dry sound it is fubar..... As for sideways movement (wiggle) there should be none......
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Toys: 2006 37' Triple E Embassy coach (powered by Cummins), 18' Sylvan Pro Fish with Mariner motors.

Proud Canadian BOOB man too!!

Please PRIVATE MESSAGE only!! ...
Please DO NOT.....visitor message me...
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