Rengar18
10+ Year Contributor
- 261
- 1
- Jun 8, 2009
-
Lancaster,
California
I get 20+ psi at the Tb pipe during a boost leak test but when I test it at the turbo inlet all the boost comes out of the valve cover (out the oil cap/pcv valve hole)
I was told all the boost is leaking past some seal in the turbo and going into the motor and that after a rebuild I should not get any boost getting into the motor. Its a 14b and I actually just rebuilt the turbo 3-4 months ago with tradergregs kit. When I first finished/installed it had 0 shaft play. Now it has a fair amount of side to side but 0 in and out.
So I have two questions:
What most likely caused the 14b to develop shaft play so quickly? I just recently tracked down some of these big boost leaks I have and I was thinking i possibly "overspun" the turbo. I've been driving around for a few months at 16 psi with big leaks present making it work harder. I also have the turbo oil feed from the ofh, I've read that sometimes its too much pressure there and it could overoil it but would it do damage like that so quickly? I dont have a oil pressure gauge so I dont know the numbers coming from it. Just wanna make sure if I rebuild it again this time I wont run into the same issue.
And would the moderate side to side play even cause all the boost to leak past the seals? I was under the impression that moderate/heavy in and out play is what generally causes this type of leak (hence why ppl sell turbo with some side to side, even calling it "normal") Only other thing I can think is a leak at the compressor cover gasket but I rtvd it pretty well but would that even cause something like this anyway?
Im so close to fixing all my leaks guys help me out! Thanks
I was told all the boost is leaking past some seal in the turbo and going into the motor and that after a rebuild I should not get any boost getting into the motor. Its a 14b and I actually just rebuilt the turbo 3-4 months ago with tradergregs kit. When I first finished/installed it had 0 shaft play. Now it has a fair amount of side to side but 0 in and out.
So I have two questions:
What most likely caused the 14b to develop shaft play so quickly? I just recently tracked down some of these big boost leaks I have and I was thinking i possibly "overspun" the turbo. I've been driving around for a few months at 16 psi with big leaks present making it work harder. I also have the turbo oil feed from the ofh, I've read that sometimes its too much pressure there and it could overoil it but would it do damage like that so quickly? I dont have a oil pressure gauge so I dont know the numbers coming from it. Just wanna make sure if I rebuild it again this time I wont run into the same issue.
And would the moderate side to side play even cause all the boost to leak past the seals? I was under the impression that moderate/heavy in and out play is what generally causes this type of leak (hence why ppl sell turbo with some side to side, even calling it "normal") Only other thing I can think is a leak at the compressor cover gasket but I rtvd it pretty well but would that even cause something like this anyway?
Im so close to fixing all my leaks guys help me out! Thanks
Last edited: