i need some advice
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New User
Joined: Aug 2011
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i need some advice
hey yall i have a 93 f150 with a 300 in it im having an issue with her that i cant seem to figure out maybe someone can help. the truck has high miles and its taken to burning oil, but the burnt oil is blowing out of the breather on the valve cover. i thought the pcv valve was clogged so i changed that and it didnt help. ive been told that the rings are possibly bad and the oil is blowing by them? would that cause the burnt oil to come out of the air breather? any help is greatly appreciated!
Junior User
Joined: Mar 2011
Posts: 54
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From: Lafayette, LA
Worn rings, compression blowing into crankcase causing excess pressure and oil coming out of breather vent. That would also be why you are burning oil. I may be wrong but that would be my guess.
Postmaster
Joined: Mar 2001
Posts: 4,968
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From: So Cal
A compression check will probably answer this.
If you know what you are doing, run the check and squirt maybe a table spoon of oil into a suspect cylinder and run the compression check again. If the compression goes up, it's the rings. If it doesn't, it's the valve guide/seals or maybe a dead head gasket or piston. Any one of these can cause pressure in the crankcase and burning oil.
If you don't know how to do a compression check just ask, I think half the guys on this site can tell you. It is simple to do and will tell you a lot about your engine.
Good Luck,
Jim Henderson
If you know what you are doing, run the check and squirt maybe a table spoon of oil into a suspect cylinder and run the compression check again. If the compression goes up, it's the rings. If it doesn't, it's the valve guide/seals or maybe a dead head gasket or piston. Any one of these can cause pressure in the crankcase and burning oil.
If you don't know how to do a compression check just ask, I think half the guys on this site can tell you. It is simple to do and will tell you a lot about your engine.
Good Luck,
Jim Henderson
Posting Guru
Joined: Jul 2009
Posts: 1,069
Likes: 1
From: Toledo, Ohio
If you know what you are doing, run the check and squirt maybe a table spoon of oil into a suspect cylinder and run the compression check again. If the compression goes up, it's the rings. If it doesn't, it's the valve guide/seals or maybe a dead head gasket or piston. Any one of these can cause pressure in the crankcase and burning oil.
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