Has anybody ever had this noise before? I can hear it the best under the truck. It’s a 2018 Chevy 2500. I have sprayed the belt with some PB Blaster to see if it makes a difference and no change. Thanks
I can hear it the best from under the truck. I can hear it a little through the grill. If I open the hood I can’t hear it at all up top. I also read that the harmonic balancer can rub against the timing cover so I sprayed some pb blaster on it I hope I didn’t hurt the crank seal.I would recommend that you change the belt. PB blaster is a penetrating solvent and will degrade rubber.
I suspect your tensioner pulley bearing or idler bearing to be making that noise... not your belt
I replaced both idler pulleys and the tensioner and the chirp is still there. The belt didn’t come in yet so it’s still running the same belt. I have talked with several people on different forums and there’s does it as well. Would really like to know what it is. It sounds like it’s coming from the harmonic balancer there is a TSB about it sliding back and rubbing the timing cover but that is for the 19 and 20 models I have an 18.That would be hard to say...
Your video is set to private and will not show.I had this exact sound coming from my 2018 L5P. I have a big thread in duramax forum It was a cam shaft bearing that failed due to a defect. Ended up with a new engine warrantied from GM.
Pop off your accessory belt and then start your truck. I am willing to bet it still makes the same noise.
Here was a video of my engine my noise.