Oil out of the valve cover

[Levisbronco]

I was driving the bronco today and had smoke coming out from under the hood. It was oil coming out of the drivers side valve cover breather(where you put the oil in) and burning on the headers. Has anyone had this happen before? What was the problem and how did you fix it? Thanks in advance~Levi

 

[flint_knapper]

Check/replace the pcv valve. also the seal on the oil filler.

 

[Levisbronco]

I replaced the pcv valve and the cap. Still coming out of the valves covers. Any other ideas? Thanks Levi

 

[YelloTx73]

Any way its bad gaskets?

 

[asabadin]

in my case this happened and it was the valve cover gasket you need to solvent clean the whole area and run it in and see where it comes from. In my case it was only apparent when the engine got a little hot, how about you?

 

[Levisbronco]

Do you think it is just the valve cover gasket I need to replace? Or do I need to replace the gasket that is under the valve cap? Also what kind of solvent do you think I should use? Thanks~Levi

 

[YelloTx73]

You need to replace the gasket that seals the valve covers to the heads, they are only a few bucks at your local parts store. As for the solvent I'm not sure what to use.

 

[Levisbronco]

Thanks, I will change it tomorrow and let you guys know the results. ~Levi

 

[Skuzzlebutt]

The vavle cover gaskets have absolutely nothing to do with oil coming out of the vented oil filler cap. I've seen situations where oil oil was being splattered up into the cap from a rocker but there should be a baffle in place to prevent this. The more common (and more painful) cause is worn rings allowing too much blow by for the PCV to handle.

 

[iwlbcnu]

The vavle cover gaskets have absolutely nothing to do with oil coming out of the vented oil filler cap. I've seen situations where oil oil was being splattered up into the cap from a rocker but there should be a baffle in place to prevent this. The more common (and more painful) cause is worn rings allowing too much blow by for the PCV to handle.

Yep, bad rings.

 

[wildbill]

%) %) %) I have seen this on the chev's they plug up the oil return holes in the head's and make a mess. To fix just pull valve cover and use a coat hanger and clean the drain holes also make sure that the oil separator in the valve cover is clean. And if you have the cheap chrome valve covers get some new ones. And as was said the PCV valve good luck. %) %) %) Bill %)

 

[Levisbronco]

Sooooooooo.......How hard is it to replace the rings or should this be going to a mechanic? How much do you think it will run?Thanks~Levi

 

[Mikey]

Rings would also have smoke out the pipes on acceleration or up a hill.

Concentrate on the PCV system if you don't have smoke out the pipes. PCV valves are available for partially open systems (open element air cleaner with filtered breather oil cap and pcv valve plumbed to carb base) and closed systems (closed oil cap with tube to closed air cleaner with pcv vlave plumbed to carb base). Mix these valves up and you can have a mess.

Mine is open so I changed to a Hi Po 66 Mustang PCV valve. Closed is stone stock with your year of Bronco. I had a few valves laying around so I experimented until one works. They have different vacuum ratings and, I believe, they are stamped on the internal part that rattles around. Try some different combos or years of valves.

All in all, key in what changed. I've had my engine get a bit hot and do a simple burp. Then, all clear. Who knows why it burped? Who cares since it's cleared up.

Good luck,
Mikey

 

[blackjack]

oil

Mine turned out to be bad head gaskets. I had a lot of blow by coming out of the valve cover. Turns out the passenger head was not level so I had them surfaced and redone and all is well now. Who ever built the motor didn't do a very good job. It only had about 15,000 miles on it.. Try doing a compression check first to see if you rings are good and if you have one that is low. that will tell you something and also about your valves. You can do a leak down test to see if you have bad valve seal as well. That would also casuse exhaust and or intake to leak into the valve cover and create pressure to blow oil out of the valve cover.

Hope this helps..