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dsalinas1939
Top Member

USA
1326 Posts

Posted - 11/05/2021 :  06:26:29 AM  Show Profile  Reply with Quote
i have a 2015 c2 6.7 cummins allison 2000 series trans hydro brakes it has the mind jaring hi pitch squeal when idled up i can not pin point where its coming from i have seen the connector at the turbo outlet to intercooler has leaked and made that sound before i took it off and replaced o ring but still there anyone run accross this what might it be

Bluenozer
Top Member

Canada
644 Posts

Posted - 11/05/2021 :  09:12:04 AM  Show Profile  Reply with Quote
turbo mount gasket or the manifold where it is in two pieces , if its the manifold just replace the whole thing, gone down that path , and removing the turbo once is enough
engine cold just spray the whole thing(manifold area) with soap(little to no water in mix, it will not run off so quick) and start it , it should bubble, or if you have a smogger(smoke machine) use this and check for leaks

OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member

USA
1326 Posts

Posted - 11/05/2021 :  10:06:01 AM  Show Profile  Reply with Quote
ok i left out an important part i replaced the manifold gaskets because one pushed out and now its makin that noise
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