Intermittent crankcase pressure issues

moper said

So if the exhaust valves are open, how come the two tests are good?

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Because the engine isn't spinning at 5000 rpm during the tests lol. You're 100% sold on the rings being the issue, got it.

T56MaxTorq said

I agree with AJ, the heads are flooding. Do you have a baffle In the valve cover to shed some of that oil?

On a whim, have you looked at the rocker shafts thoroughly? You beat the **** out of them with that mistake on their orientation. Could they be cracked? The end caps dislodged? Are they even positively seated correctly now? You said the condition improved after correcting the rocker shafts, that’s a good thing and a sign of the original problem. Could it just be residual oil at this point? A soaked breather is going to have a lot of residual oil that will heat up and leak over everything.

I too have crankcase pressures that are high - it’s the turbos fault with loose tolerances. I run plumbing to an oil separator and drain it off.

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I only bent a few pushrods. The shaft seemed to seat pretty good and didn't have anything obviously wrong. I did everything but pull the heads and valves back in February. I put a new breather on in case the other one was too restrictive as well and it's coming from more than just the breather so it's not residual.



Cylinder walls all look flawless, couldn't get the heads disassembled with the valve spring compressor I have so they're going to machine shop tomorrow. Kinda bummed I won't get to figure this out myself but chances are they were gonna have to go anyways.

EDIT: just kidding I ordered a better valve spring compressor from Summit and hopefully I'll be getting to the bottom of this mystery Monday or Tuesday.