Hey Everyone,
I swapped out my main seals about 40000km ago and now theyre both leaking again. '98 5.9L 4x4.
Now, I remember reading a thread or post about these older engines building pressue in the crankcase and blowin out the seals. In the same thread it spoke about an oulet on the intake manifold that could be used to help release the pressure.
For the life of me I cant seem to find the thread again.
Is there any truth to this or is my brain lying to me?

 

PCV system is supposed to keep a bit of vacuum on the crankcase. If it isn't functioning properly, or, you have excessive blow-by, pressure will build instead. Take off the oil fill cap, engine running, and put a piece of paper over it, is it sucking in, or blowing out?

 

What brand seals did you use?

 

Timken seals.

 

Thanks Heyyou for the suggestion, I'll be doing this tomorrow to see whats up?

 

I did as you suggested, seemed like it was sucking the paper down.
the PCV valve was reslly chattering as well, not at first, but after i pulled from the valve cover and rattled it around it started to chatter afterwards.

 

So PCV is operating properly. Theoretically. Check the hose between the valve and intake manifold, see if there is oil in there.

 

yeah theres a enough to notice and form a drop on the end of the hose at the intake.
Is there supposed to be another hose on the driver side of the intake? I have a port on that side that is simply capped off.

 

Yeah, the other side should just have an elbow, with a hose that goes to a fitting on the air filter housing. if it's just capped off, that will put more vacuum on the crank case than there should be... Though, I am unsure if that would actually cause any problems.....

 

Okay, so the hose coming off the air filter housing goes into a rubber grommet on the driver side valve cover... second pic