Help: sounds serious; looking to buy a 95 F 150 4.9; Auto 4x2; blows oil thru breather

Thanks
Later/Tater

 

i'm guessing you are talking about a valve cover breather??? if you are blowing oil out the valve cover you are looking at having a couple bigger problems that aren't fun to deal with...

 

It could be anything from a bad PCV valve to broken rings or pistons. Most 4.9s seem to stay pretty tight until 250k with basic care. If your serious about the truck do a compression check to check the health of the cylinders.
regards
rikard

 

They come too ofter: oil blowing back into the air intake filter

Later/Tater

 

like suggested above. Get a $20 compression tester and check the compression in each cylinder. I usually squirt a little oil in to seal the side wall. if you have bad rings or a broke piston it oil won't make a difference. If it were me... I would want 100psi minimum in each cylinder, and no more than a 10% difference between each cylinder.

 

I had the same problem in my truck for years, finally gave in and bought a new engine vs tearing mine apart.

 

from personal experience i have had two start giving me the same trouble and both are dead now it is very wise to do as he had said (check the compression first) if i had done that maybe my engines would still be going

 

if you have your engine running and you pull the valve cover breather tube out of the side of the air filter box is there smoke coming out also?

 

Mine did........................

 

mine was doing that and after tearing out my engine and taking the head off i could see and feel a scratch on the wall of a couple of my cylinders. therefore, i had a couple cracked rings and paid to have my engine rebuilt. blow by with smoke is almost always a cracked piston ring

 

That was my assumption too. I got a reman motor with warranty for cheap to replace. This sounds like a common problem.

 

yeah, it happends here and there. i had mine totally redone, (new cam, pistons, timing chain and everything) all for $2100 thats including having the head rebuilt also.

 

The last one I had with blow by... the 83 red one below... My FIL thougth it was just a litle "slack in the cylinder" and that it was ok... I told him not to run it... What did he do??? Drove it the next day to the feed store. Shattered the piston skirt and put 4 cracks in the side wall of the #3 cylinder. I'd have to sleeve the cylinder to save the block... In other words it's now a JUNK BLOCK. I really wouldn't by a motor with blow by unless the truck has zero other problems and is really cheap. Blow by is just a ticking time bomb...