Gravelguy413 Posted March 20, 2022 Share Posted March 20, 2022 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. Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/ Share on other sites More sharing options...
Mark T Posted March 20, 2022 Share Posted March 20, 2022 Maybe a leak somewhere in the plumbing between the turbo and engine (charge air or hose) ? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492773 Share on other sites More sharing options...
Joey Mack Posted March 20, 2022 Share Posted March 20, 2022 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 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492775 Share on other sites More sharing options...
Hans Remmers Posted March 20, 2022 Share Posted March 20, 2022 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. Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492776 Share on other sites More sharing options...
Popular Post theakerstwo Posted March 20, 2022 Popular Post Share Posted March 20, 2022 Easy way to check for belt problems is take it down the road and stop and spray some soapy water or belt dressing on the belts and get back in and mash on it again.If it still there then you may have a turbo boost leak.I check that with a fitting i made to go in the piping from turbo to the air/air cooler.Ii have small hose connected to the fitting i put in the piping with regulated air pressure of 25 psi from the shop air.Air it up angainst the heads and listen or spray with soapy water.You may have to turn the engine slowly till your air pressure comes up as hi as you can get it. 2 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492782 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 Can you get it to squeal with the truck parked and rev the engine? Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492783 Share on other sites More sharing options...
Joey Mack Posted March 20, 2022 Share Posted March 20, 2022 hell glenn, his is all mechanical.. he can just stand there and rev it up... jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492784 Share on other sites More sharing options...
Gravelguy413 Posted March 20, 2022 Author Share Posted March 20, 2022 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 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492789 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 (edited) 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 March 20, 2022 by Onyx610 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492791 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 (edited) 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 March 20, 2022 by Onyx610 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492792 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 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. Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492794 Share on other sites More sharing options...
Joey Mack Posted March 20, 2022 Share Posted March 20, 2022 you rekon you have a squealing center bearing.? jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492795 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 Odd it’s only under load. Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492797 Share on other sites More sharing options...
Gravelguy413 Posted March 20, 2022 Author Share Posted March 20, 2022 Nothing mounted. Pto off of tranny. What is a center bearing? Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492798 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 Carrier bearing Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492799 Share on other sites More sharing options...
Onyx610 Posted March 20, 2022 Share Posted March 20, 2022 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. Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492801 Share on other sites More sharing options...
Gravelguy413 Posted March 20, 2022 Author Share Posted March 20, 2022 Will do. Definitely coming from engine bay 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492803 Share on other sites More sharing options...
JoeH Posted March 20, 2022 Share Posted March 20, 2022 (edited) 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 March 20, 2022 by JoeH Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492807 Share on other sites More sharing options...
Gravelguy413 Posted March 21, 2022 Author Share Posted March 21, 2022 Ok great will check all this, thanks Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492809 Share on other sites More sharing options...
Joey Mack Posted March 21, 2022 Share Posted March 21, 2022 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 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492815 Share on other sites More sharing options...
Gravelguy413 Posted March 21, 2022 Author Share Posted March 21, 2022 Ok will check that also. Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492836 Share on other sites More sharing options...
fjh Posted March 21, 2022 Share Posted March 21, 2022 Just a few thoughts ! Exhaust leak at turbo flange gasket or exhaust gaskets ! Boost leaks Check the charge air hoses including to compressor! Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492838 Share on other sites More sharing options...
Joey Mack Posted March 21, 2022 Share Posted March 21, 2022 '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 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492882 Share on other sites More sharing options...
Joey Mack Posted March 21, 2022 Share Posted March 21, 2022 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 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492887 Share on other sites More sharing options...
doubleclutchinweasel Posted March 21, 2022 Share Posted March 21, 2022 The grandkids still do the balloon thing. Laugh their butts off every time. 1 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/69407-engine-squeal/#findComment-492892 Share on other sites More sharing options...
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