4.2 oil

[bigbill]

Have a 4.2 that has good compression(135). Keeps blowing oil out the breather and the oil fill plug(aluminum valve cover). Any ideas on what to do to fix this problem. It also has 25-35lbs of oil pressure.

 

[trailjeepman]

The oil fill cap is bad for leaking when the seal goes bad. A replacement cap is cheap at Advance I think.

 

[JavaTee]

When was the last time you changed your PCV valve? If recently, check to see if your lines to and from might be clogged.

 

[upnover]

How many miles?
Sounds like you have(if it's not the PCV valve issue) blow-by. This happens when cylinders are worn and compression leaks by the rings and fills the crankcase with compression, it has to go somewhere, so out the top of the engine it comes.
the fix? rebuild or another engine.

 

[foreman1063]

How many miles?
Sounds like you have(if it's not the PCV valve issue) blow-by. This happens when cylinders are worn and compression leaks by the rings and fills the crankcase with compression, it has to go somewhere, so out the top of the engine it comes.
the fix? rebuild or another engine.

That's what I was thinking, but wouldn't his oil pressure read more than 35 psi?