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01-26-2019, 06:39 PM
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Join Date: Aug 2015
Location: Alberta
Posts: 1,269
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Duramax Squeeling Noise - Engine Bay
2009 duramax.
Backyard mechanic here... or in other words, someone who throws parts at things until it's fixed. But this is officially starting to drive me crazy.
Replaced:
- Alternator
- both idler pulleys
- tensioner pulley
- AC compressor
- belt
Still squeeling!
Water pump is gear driven, so don't think it's that.
Fan clutch is my next guess, as I think the sound is coming from the middle of the bay. Don't think it's the power steering pump, as that's mounted on the drivers side of engine and it doesn't sound like that's where it's coming from. But I thought the same thing three times now...
Should have tried a stethoscope to begin with but I'm committed now....
Ideas ???
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01-26-2019, 06:46 PM
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Join Date: Apr 2008
Posts: 2,939
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I had a 350 chev gas motor and I found if I put a jobber fan belt on it then it still squealed. If I bought an expensive belt from the chev dealer it did not squeal. Just something i found with that motor.
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01-26-2019, 06:52 PM
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Join Date: Aug 2008
Location: CNP
Posts: 3,760
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Could you take the belt off completely and let it run for a few minutes not moving and check for squeal?
__________________
You are what you do, not what you say.
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01-26-2019, 06:54 PM
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Banned
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Join Date: May 2007
Location: YEG
Posts: 9,981
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To immediately rule out the belt, is to spray it with silicone spray and if the noise goes away it is the belt. If it doesn't go away, knock the belt off, spin each pulley by hand and listen with a stethoscope on every pulley. 
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01-26-2019, 07:07 PM
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Join Date: Oct 2009
Location: edmonton
Posts: 1,854
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Trade it in
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01-26-2019, 07:57 PM
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Join Date: Mar 2016
Posts: 584
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I guess that leaves the power steering pump! Or you have a turbo to engine leak .
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01-26-2019, 08:02 PM
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Join Date: Sep 2018
Posts: 49
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You're sure your belt is tensioned properly?
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01-26-2019, 08:36 PM
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Join Date: Jan 2013
Posts: 384
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Lmm duramaxs did have water pump/shaft issues.
More of a growl.
Run it without a belt for a couple minutes. If no chirp or squel then it's the belt probably, could be ps pump. Cheap after market belts are known for this.
Worst case if it still squeels start looking at the trans.
Aftermarket turbo by chance?
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01-26-2019, 08:38 PM
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Join Date: Feb 2010
Location: ft assiniboine area
Posts: 1,392
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air leak on piping between turbo and after cooler . been there , done that .
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01-26-2019, 09:09 PM
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Join Date: Aug 2015
Location: Alberta
Posts: 1,269
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Never thought about trying without the belt...
Will try that next! 🤘
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01-26-2019, 09:31 PM
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Join Date: Dec 2010
Location: Southern Alberta
Posts: 635
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Quote:
Originally Posted by liar
air leak on piping between turbo and after cooler . been there , done that .
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X2. I’ve had a intercooler pipe rubber connector delaminate and do weird things.
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01-26-2019, 11:49 PM
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Join Date: May 2016
Location: Parkland County
Posts: 2,384
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Quote:
Originally Posted by liar
air leak on piping between turbo and after cooler . been there , done that .
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This is a somewhat common dmax squeal.
__________________
And unlike the clock on the wall at your momma house, I do not have time to hang.
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01-27-2019, 02:10 PM
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Join Date: May 2007
Location: Edm.
Posts: 4,931
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Does the noise happen only when driving or does it happen while in park.
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01-27-2019, 03:09 PM
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Join Date: Aug 2015
Location: Alberta
Posts: 1,269
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Quote:
Originally Posted by -JR-
Does the noise happen only when driving or does it happen while in park.
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Both. It's just really noticable when it's parked. Can and road noise drowns it out while driving.
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