Forcing oil out of my valve cover breather

**fast4ord** · 05-18-2007, 10:59 PM

Getting alot of oil out of this. I have a new pcv, did a compression test and its 130-140 all 4 cylinders. I have a remote breather with a k&n open element breather on it. Any of you guys, bob or mike , have any ideas on this. Thanks

**loutheplumbr** · 05-19-2007, 01:23 AM

is it a motorcraft pcv if not thats probally the problem

**George C** · 05-19-2007, 01:33 AM

even tho you did a compression check. that doesnt mean the rings or pistons arent bad. i did numerous compression checks on a motor and it read great every single time. but it puked oil out the breather. found out piston was bad

**fast4ord** · 05-19-2007, 10:17 AM

Yes its a motorcraft pcv, How could a piston be bad unless its the rings or a crack/hole in piston which would not build compression. I don't know, it doesn't burn oil, wierd.

**George C** · 05-19-2007, 12:41 PM

Originally Posted by fast4ord

Yes its a motorcraft pcv, How could a piston be bad unless its the rings or a crack/hole in piston which would not build compression. I don't know, it doesn't burn oil, wierd.

you can still build compression with a bad piston. if a corner of the piston is slightly messed up and the rings are still good itwill still seal some but with the motor moving up and down in the cylinder that is when oil will be pushed by the piston and then can lead to being blowby

or itcould be a simple poor crankcase ventaliation, but to much of this will cause a motor to end its life earlier

**fast4ord** · 05-19-2007, 12:49 PM

I think i fingered her out. I put the stock oil seperator type breather in the valve cover, then i ran my remote k&n remote off of that, and put it vertical. Before i had it horizontal. I took it for a ride and put boost to it and it is not blowing oil out now. Going to clean the breathers really good, but i think its fixed for now. Thanks

**Domination** · 05-19-2007, 07:31 PM

Originally Posted by Quik

you can still build compression with a bad piston. if a corner of the piston is slightly messed up and the rings are still good itwill still seal some but with the motor moving up and down in the cylinder that is when oil will be pushed by the piston and then can lead to being blowby

or itcould be a simple poor crankcase ventaliation, but to much of this will cause a motor to end its life earlier

If a piston has enough damage to it to cause blow-by and pressurize the crankcase, you would see a drop on a compression test in that cylinder.