I got a 95 f250 with a 460 big block that's leaking oil out of the crankcase breather line, oil filler cap, and dipstick tube. anyone know what could be the cause of that

 

Check PCV valve and vac hose connected to it for blockage.

 

thought the pcv was the problem at first too and replaced it. all the hoses are clean

 

Did you actually check for vacuum at the PVC valve?



Just checking....

 

Excessive blow by??

 

Meaning smoke coming out of the filler cap when its open and the engine is at idle along with the crankcase vent tube? Yes

 

I'd say, if its blowing out the dipstick...

 

It is and that's what I'm trying to fix just don't know how and can't afford to take it to a shop

 

Is your air filter covered in oil?

 

Yeah its all coming through the crankcase breather

 

Most likely the rings are bad if you have excessive blow by...combustion pressure is getting past rings into crankcase so the pressure basically finds its way out somehow..hence y it'll blow out ur dipstick...just my 2 cents

 

I had a buddy tell me the same thing so now that I'm hearing it again it makes sense

 

Ive heard also from a old man once the same thing if you have excess oil from the crankcase breather your rings are bad.

 

The blow by on my old 302 was so bad that I had to run 2 separate hoses as road draft tubes and let the excess hose run down the sides on the wheel well liners. I then mounted a PCV valve catch can and then another catch can between the air filter and the oil fill for the breather element. If I hadn't pulled the engine, it would have lasted for years. Cylinders had 140-150 with #8, 135-140psi compression. All plugs were clean and upon pulling cylinder heads, the pistons were still only very lightly carboned.

 

Remove the valve cover, verify the PCV valve baffle on the underside isn't clogged with sludge preventing all air flow.

If its clear too? then yea its all blow by, compression test would confirm it. Vac gauge would show you how bad it is.......well that plus the amount of oil blown out.