Whistle/squealing sound after headgaskets

[zakkb787]

https://youtu.be/eL3D6FYVPxI

Here is the video of the air escaping during the test. Boost gauge was reading maybe 5psi so a pretty nasty leak

 

[bludelux]

What is leaking? My LBZ is making the same noise.

 

[zakkb787]

What is leaking? My LBZ is making the same noise.

I won't have a chance to pull it apart till April sometime. But it's either the y bridge or intake runner not seated or sealed correctly

 

[MadMax17]

Make sure when you install the y-bridge that you tighten the lower bolts first as they will suck the bridge downward into the sealing surface. Then tighten the top and recheck all bolts, if this is not done then the bridge will not seal.

 

[zakkb787]

Finally got around to taking some stuff apart. My y bridge was loose but wasn't the issue. Somehow my passenger intake runner is leaking under the y bridge. Yay. Also my turbo is getting just a smidge of play. Not really wanting to tear it open just yet so I put it together and gonna wait till I can get a 63.5 cover and DP. Ugh. Issues issues issues.

 

[Awenta]

A wheel and cover won't solve any kind of play


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[zakkb787]

A wheel and cover won't solve any kind of play


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Even if I rebuild it?

 

[Brent@LDS]

If you rebuild/balance it you will be good to go.

 

[zakkb787]

About what would a rebuild/balance run generally? Also just to clarify I've done more reading and the shaft has a very minimal bit of play up and down. None in and out. Is that normal?