Oil spitting from exhaust

[Shran]

Nope, you will have to remove the valve covers though.

 

[birddog321]

sounds easy enough. How many are required for a full set

 

[birddog321]

Could bad valve stem seals cause the dip stick to read no oil in the oil pan after the motor warms up, but read normal after shut off for about 20 Minutes.

 

[Shran]

sounds easy enough. How many are required for a full set

They come in a set, but if you could buy them individually, you'd need 12

Could bad valve stem seals cause the dip stick to read no oil in the oil pan after the motor warms up, but read normal after shut off for about 20 Minutes.

No, that sounds more like the oil passages that drain back into the block from the heads are somewhat clogged. That is not normal and you should definitely look into that... and wait 20 minutes before you pull the valve covers or you'll probably have a huge mess!

edit - they could be plugged with pieces of the old valve stem seals, make sure you check that out

 

[birddog321]

If they are how do i clean them out?

 

[Shran]

Well... that is an interesting question. You could blow whatever is clogging the oil passages down further into the block, potentially clogging something else - like the oil pump pickup screen. You could also try vacuuming it out or just picking it out with tweezers if you can, but you might not get all of it. You basically have the choice between causing major damage to the bottom end of your engine because it will starve for oil if you do nothing, or potentially causing major damage to all of your engine if something else is clogged.

The best way to fix it is to tear the engine down and clean it ALL out but I don't know if that is a realistic option in your situation.

If anybody has better ideas feel free to post them...

 

[birddog321]

Any suggestions would be helpful. You guys are an awesome resource.

 

[Angie]

Are you sure you are having oil spitting from the exhaust pipe? and not un-burnt gas? Do you get strong gas smell from the tail pipe? cheers.

 

[Big Jim M]

Ok Burofd!

thanks I may try it this weekend. Will i have to drain the oil?

Let's talk about this a bit. First of all if there is oil coming out the tail plpe the muffler is about 1/3 full of oil! If that happens there WILL BE an oil fire UNDER your vehicle..
My point here is you have disoriented yourself. That WAS NOT oil you think you saw. Most likely you saw some condensation that was full of soot and was blackish.
So whatever you do to that engine forget about oil in the tail pipe. Fix whatever you want to fix, but do the fix'n without the oil in the tail pipe in mind.
I'm surprised at the answers you have got and none of them even THOUGHT about how hard it would be to get oil to drip out the tail pipe!
So if something else is wrong with that engine go ahead and repair it..
Big JIm

 

[birddog321]

That makes a lot of sense. The exhaust does smell bad. Still going to change the valve rod seals this weekend. She's been so rough this week I had to down grade to the Buick

 

[Shran]

Let's talk about this a bit. First of all if there is oil coming out the tail plpe the muffler is about 1/3 full of oil! If that happens there WILL BE an oil fire UNDER your vehicle..
My point here is you have disoriented yourself. That WAS NOT oil you think you saw. Most likely you saw some condensation that was full of soot and was blackish.
So whatever you do to that engine forget about oil in the tail pipe. Fix whatever you want to fix, but do the fix'n without the oil in the tail pipe in mind.
I'm surprised at the answers you have got and none of them even THOUGHT about how hard it would be to get oil to drip out the tail pipe!
So if something else is wrong with that engine go ahead and repair it..
Big JIm

Oil vapor can travel throughout the entire exhaust system. My buddy has a 400 in a '79 F150 that will literally spray oil droplets out of the exhaust if you get into the throttle really hard.

I agree that it is highly unlikely that the muffler is full and that it very well could be condensation. I am just going by what he said, if I saw something I thought could be oil coming out of my exhaust I'd feel it, smell it - whatever it takes to identify it, so I assume that someone else would do the same.

 

[Big Jim M]

I doubt that also!

Oil vapor can travel throughout the entire exhaust system. My buddy has a 400 in a '79 F150 that will literally spray oil droplets out of the exhaust if you get into the throttle really hard.

I agree that it is highly unlikely that the muffler is full and that it very well could be condensation. I am just going by what he said, if I saw something I thought could be oil coming out of my exhaust I'd feel it, smell it - whatever it takes to identify it, so I assume that someone else would do the same.

C'mon! Enough with this vapor crap! Oil vaporizes and turns to smoke! It don't recreate itself into oil again.
It is possible for oil to come out the exhaust...ONCE! In it's last gasp!
Any oil that gets into the chamber gets burnt.. If some doesn't get burnt the plug will foul and start missing.. Indicating the demise of the engine.
Big JIm

 

[Shran]

C'mon! Enough with this vapor crap! Oil vaporizes and turns to smoke! It don't recreate itself into oil again.
It is possible for oil to come out the exhaust...ONCE! In it's last gasp!
Any oil that gets into the chamber gets burnt.. If some doesn't get burnt the plug will foul and start missing.. Indicating the demise of the engine.

So if the exhaust valve seals are leaking oil into the combustion chamber during the exhaust stroke (when the plug does NOT fire) where do you think that oil goes? You're right, it will foul the plugs, which he indicated here:

She's been so rough this week I had to down grade to the Buick

Look man, I don't want to argue. I am just telling it like I've seen it.

 

[Hotrodlincoln]

I'm surprised at the answers you have got and none of them even THOUGHT about how hard it would be to get oil to drip out the tail pipe!

I was wondering the same thing throughout reading this entire thread.

So if the exhaust valve seals are leaking oil into the combustion chamber during the exhaust stroke (when the plug does NOT fire) where do you think that oil goes? You're right, it will foul the plugs, which he indicated here:

It'll probably get burned by the 1000°F+ exhaust gases leaving the cylinder?

Funny thing about oil though, when it burns it leaves a residue. It's not "oil" anymore, but its similar. But you have to burn a LOT of oil to get drops of oil residue forming inside the tail pipe. I mean you would have a blue cloud that could reach to mars by the time you found droplets in the exhaust pipe.

 

[Big Jim M]

Certainly I'm right!

So if the exhaust valve seals are leaking oil into the combustion chamber during the exhaust stroke (when the plug does NOT fire) where do you think that oil goes? You're right, it will foul the plugs, which he indicated here:

Because I have THOUGHT about the problem! Little if any oil enters the chamber from the exhaust valve seal! If anything compressed mixture will go backwards into the engine out of the chamber during the exhaust cycle. It is the intake valve that has the suction on it and awards the chamber with oil.

Look man, I don't want to argue. I am just telling it like I've seen it.

I betcha you are the only guy on this forum that has seen it. You are indeed a special person.

Big JIm