Excessive pressure out CCV/PVC system

[Dogote]

1986 MJ 2.5. Lots of miles but when I was putting the new head on, the cylinder walls looked decent, and the engine had reportedly been overhauled by the owner before the guy I bought it from. I have good compression, and it does not use much, if any, oil.

 

I converted from the PCV type plastic valve cover the the aluminum cover. I routed the front line that comes out the side into the vacuum port at the bottom of the throttle body via the metal vacuum lines. It has a 2 mm restricter in the line because I used a auto parts store fitting with a larger hole.

 

Its Sunday, and I live in a small town, I don't have, and couldn't get, a hose to connect the rear plastic elbow to anything. My plan was to run it into the metal lines, and hook the other end to the airbox. At first it blew LOTS of pressure out, and oil with it. I threw a PCV valve on it to hold the pressure in (yeah, I know, bad idea) and the it blew the other line off on a trip around the block.

 

How much pressure should be there? Why would I be making so much pressure beside rings being shot? Good compression, no oil burned. But what else beside rings? BTW, everything it totally clean if not new. I have a feeling I am going to have to tear into the bottom end now. Damn it. No time to do this until winter and I really need this truck for summer projects.

[Eagle]

You hooked it up backward.

 

The front should be the inlet -- that's what should connect to the air box. The PCV valve at the rear is the suction -- the PCV fits into the gasket in the valve cover, and the line from the PCV valve then goes to the intake manifold. A PCV valve is a one-way check valve. It can't work if you try to make the air flow the wrong way.