squealing when accelerating - Ford Powerstroke Diesel Forum
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Old 06-09-2013, 09:00 AM
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squealing when accelerating

noticed the other day when i was accelerating from a stop sign that my Excursion had a loud squealing sound. of course i assumed the belt and checked it when i got home. belt is fine. no cracks and not dry. it only does this when the fan clutch is locked so i am assuming its the accessory drive system. when the engine was running it seemed that the upper idler pulley was moving just a wee bit so i replaced it and the belt to be on the safe side and it is still there. would a water pump do that? its not leaking and i have no shaft play.
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Old 06-09-2013, 06:30 PM
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Sounds like a belt tensioner to me. If I were you I would try that. The spring on you old tensioner is probably worn out.
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Old 06-18-2013, 01:59 PM
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I had the same problem and it was my tensioner.
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Old 06-18-2013, 07:41 PM
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i ended up replacing the tensioner the other day and it solved the problem. i forgot to get on here because i have been busy moving and selling my home. thanks for the heads up though.
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