Why am I getting a lot of oil in my breather on my 300 6cyl? Inside the tappet cover the oil looks milky or foamey I am giving it a oil change and plugs! But I don't understand why the oil is blowing into my air filter. I'm not gonna do a oil change til I figure out why I'm getting all the blow by! It doesn't use any oil and does not smoke, so any help on figuring this out is greatly apparicated.

 

That is the intake for the crankcase breathing system. You should have a PCV valve somewhere, usually stuck in a hole in the valve cover. With the engine running pull this out and stick your thumb over it. You should feel vacuum on your thumb. If you don't, that is your problem and the valve is clogged or the vacuum line is clogged or not hooked up.

There is normally some air and blowby from the piston rings and pistons inside the engine. This has water and fuel in it, and will create a dirty sludge that will gunk the engine up. The factory put the PCV valve in place, it's a controlled vacuum leak. It lets the engine suck all this junk down into the intake then it can be burned with the fuel from the carb.

When the PCV valve sucks all this bad stuff out of the engine, fresh air has to come in. That is what the thing in the breather is for, to let fresh air into the engine. There are usually two reasons you get oil up there; Something is not hooked up or working right with the system, or the engine is so worn out and there is so much blowby, that the PCV valve can't handle it all and it starts backing up into the aircleaner.

If everything is hooked up and working, and the engine seems to be in very good condition, another reason can be a stuck ring. A engine that sits around a lot can get stuck rings and that can cause a lot of blowby.

 

What shape is the PCV system in? If you pull the valve when running do you have vacuum at the end? If not that could be the reason for the oil in the air filter.


the other thing to do is a leak down test to see where compression is going. The 2 compression rings could be bad but the oil control ring good and why no oil buring.
Dave ----

 

Thank you for the help, as soon as the weather gets nice again( it was 85 yesterday) now today it is 55. I am trying to over this bronchitis, so i'm gonna go thru everything to see if I can find the problem. Plus I am gonna do a compression test. Thanks for the help, once I figure it out i'll post my findings. Again Thanks