Turbo noise is there any suggestions

[KennyD]

I have a 2005 Topkick C5500 LLY 6.6L and it only has about 140 000kms on it. its been making a squealing noise that starts around 1200rpm from the turbo or somewhere close to it, but its not consistant and its still making good boost. i wonder if there is a common problem with them? i have sprayed soapy water around the clamps and i cant see it bubbling anywhere. i bought the truck used and it does have a positive air shut off, i dont know if its been activated while it was in high idle or not. does anyone have any suggestions

 

[paint94979]

Remove the intake and turbo inlet... Check the wheel for excessive in n out and up and down play. My guess is your turbo is in need of a rebuild

 

[KennyD]

Ok I will do that, I know there should be a little bit of thrust play but what is not longer acceptable play?

 

[The Neens]

A leaking up-pipe gasket will also produce a high-pitched squeal...

 

[KennyD]

Where is that about, between the exhaust manifold to the turbo?

 

[paint94979]

A leaking up-pipe gasket will also produce a high-pitched squeal...

This is definitely worth a shot but given you said boost numbers have not dropped I wouldn't suspect an exhaust leak. You have 4 potential areas that could leak the 2 where the up pipe connects to the turbo pedestal and where the up pipes connect to the exhaust manifolds

 

[KennyD]

Ok since I have the dog house cover off I can see and feel for leaks, I can't see any soot leak marks and can't feel any leaking.

 

[paint94979]

Check your shaft for play