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Hey guys working with a 96 em7-300 all mechanical. I get a squealing noise that comes on at about 1600 rpm and I can accelerate thru it and it goes away about 1800 rpm. Could this just be a belt or what else should I check, thanks in advance.

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just for kicks,  is the crank pully worn out?  I have replaced a few of them due to wear, and a couple of them were splitting..  However, MarkT makes a good point...  jojo

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4 minutes ago, Joey Mack said:

just for kicks,  is the crank pully worn out?  I have replaced a few of them due to wear, and a couple of them were splitting..  However, MarkT makes a good point...  jojo

I've seen one rot and fall completely off the engine.  On a truck with minimal rust.

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I have not been able to get it to make the noise when parked only when driving so that makes it more difficult to diagnose . No slop in turbo.  When it starts squealing I get off the pedal and it will keep squealing until rpm’s drop below the 1600. Drives me nuts

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I was gonna say if you could get it to do it when parked you could take the belt off. Things like these are so simple but can be a pain in the butt to pin point.  

Edited by Onyx610
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Maybe jut throw a belt on it and see what happens. From what I have seen boost leaks can usually sound like a dentist drill. Usually go through the whole rpm range picking up higher as the rpms climb. I also haven’t been doing this nearly as long as some of the above. 

Edited by Onyx610
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Do have any odd accessories mounted on the engine that the belt runs off of? Central hydraulics? Like the ones with a driveshaft coming off the crank. 

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Only thing I can suggest is take belt off and spin Pulleys by hand and see how they feel/sound. At that point just put a belt on it. Then you can either have it fixed or eliminate that part of it. 

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Belt will squeal in lower gears, high RPM when it works hard pulling air.  When you're in higher gears it shouldn't squeal, as the fan speed becomes more closely matched to wind speed.

 

It shouldn't squeal at all, but a belt that's a little loose will act like the above.

Edited by JoeH
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here is another one of my crazy thought's....  since it wont do it sitting still,  while it is sitting still,  turn the heater fan on high, turn the headlights on high and what ever else you have that pulls hi amps, and rev it up.... if it squeals, maybe you have an issue with the alternator.. hell i dont know,,,  jojo

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Just a few thoughts ! Exhaust leak at turbo flange gasket or exhaust gaskets ! Boost leaks  Check the charge air hoses including to compressor!

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'F' has good points, that squeal can sound like letting air out of a balloon, by pinching it off with youre fingers... I hope I painted a good picture of what I mean... :) jojo

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I'm glad you found that funny, DCW...  I didn't know how to describe the balloon fart noise that we made as kids.....   Dang'it.... I think I just did....  :) jojo

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