Oil Breather Cap Problem

[feifong]

my car is an 83 mustang It keeps throwing oil all over the exhaust manifold i have replaced the oil cap twice and still keeps leaking it i have even put more gaskets on it and have sealed the bottom of the cap with gasket maker Anyone got any ideas. It loses about half a quart everyday

is it ok to just buy a regular cap that doesnt have a breather on it?

 

[Curse]

If you car is overflowing from the oil neck, then you got bigger problems than a oil cap.

 

[feifong]

oil

the oil neck?

 

[Curse]

where you put the oil in, located on the valve cover. Filler neck if you want to call it that

 

[feifong]

yea its overflowing what you think is the prob?

 

[Ranchero5.0]

With the cap off can you see the rockers down the hole? If so then the rockers are slinging oil up. Guy mistakenly take the baffle out to get more clearance for the rockers in stead of making a new flatter baffle. Check it out.

Jamie

 

[feifong]

with the cap off i dont see anything there is only like a metal piece

 

[Curse]

Does oil come out of the dipstick too?

 

[feifong]

thats what i see all the time there is always oil on the dipstick tube and on top of it

 

[Curse]

Possible blowby?? I don't want to tell you something its not so I'll let the other guys chime in.

 

[feifong]

this car just had an overhaul 1 1/2 yrs ago i think you are correct on the blow-by

 

[Ranchero5.0]

I'd do a compression check too. That much and you may have more than just blowby.

 

[feifong]

if compression is good does that mean there is no blow-by?

 

[Ranchero5.0]

No, but if it stays the same accross each bore you don't have a holed piston or bad head gasket.

Jamie

 

[HISSIN50]

do you have adequate crankcase ventillation (other breathers, PCV, etc)? if not, the pressure will take the path of least resistance (an overloaded breather, seals, etc).

and as Jamie said, a leakdown test is much more revealing for finding a source and volume of poor sealing.

good luck.

 

[jruppert]

I had a situation where I was getting oil out of the dipstick like crazy and it was a new engine. I even tried oil breathers and it made it even worse. I ended up taking the lower off and found that the lower gasket had blown out. It was blown out at the middle and forcing the block to be pressurized. I replaced it and no problems since.