Tea kettle whistle

[weazel]

New to 6.4's but my work truck is a 6.4 ******d and lightly tuned, the motor was changed (it's a long story the shop screwed us over, charged $22k took 5 months and the truck runs like chit) but..... 3 weeks after we got it back it ate the turbos, so bad that the oil was pouring out the tail pipe, well long story short I put new turbos in, in my yard, on the company dime, that's right they paid me over time, and I took it for a test drive it will whistle like a tea kettle when you let off the throttle under boost


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[JMart]

bellows?

 

[PowerStrokeEnginuities]

if turbos were just done, i would start off with up pipe gaskets along with mating surface of both turbos if they came separated.

 

[weazel]

bellows?

That's what I thought too......

if turbos were just done, i would start off with up pipe gaskets along with mating surface of both turbos if they came separated.

We also thought we might have a leak at the up pipe gaskets, the turbos came together but I'm not sure how good the shop was they were clocked all wrong and what not


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[estew6.4]

Did you ever find out what was causing this I have the exact same problem. Loud whistle after letting off throttle during high boost... already have aftermarket up pipes (Flo-Pro) installed about a year ago... someone said the fuel cooler pump was the culprit but can't see that being the it when it only does it after high boost

 

[MrMike2010]

My 6.0 whistled just like this after I blew the headgaskets. Under high boost it would pressurize the degas and after I let off it would whistle when it released the pressure.

 

[estew6.4]

Oh boy! Hahaha I hope I didn't blow a headgasket... I'm studded but I have hit some 40+ psi on occasion... haven't noticed any signs of a blow gasket but looks like I'm gonna have to look a little harder just in case

 

[sootie]

cracked uppipes or loose uppipe connections, warped manifolds/broken studs, or blown headgaskets.

 

[Constructionworker]

My 6.4 would have a strange whistle sound and it ended up being that elbow that connects to the turbos. The dealer didn't put a bolt or two back in and under boost it would pull apart

 

[sootie]

My 6.4 would have a strange whistle sound and it ended up being that elbow that connects to the turbos. The dealer didn't put a bolt or two back in and under boost it would pull apart

truth-i forgot about that. also could be a split boot.