[DeTomaso] Oil Smoke From Breathers

[Dan F. Courtney]

The PCV is in correct and I exchanged it with a new one.
The prior PCV had a 3/8" opening, but the part listed is only about 5/16".
No smoke out of the tailpipes, and this engine has been blowing the oil mist 
out of the breather between 3,800 & 4,500 rpm's since it's maiden voyage.

Dan

--------------------------------------------------
From: <wkooiman at earthlink.net>
Sent: Wednesday, May 18, 2011 4:12 PM
To: <JDeRyke at aol.com>; <dfcex at pacbell.net>
Cc: <detomaso at realbig.com>
Subject: Re: [DeTomaso] Oil Smoke From Breathers

> Agreed, but "past the seals" includes the intake gasket.  You didn't 
> exclude the intake gasket, but you didn't mention that it is an often 
> overlooked source of "sucking oil".
>
>
> -----Original Message-----
>>From: JDeRyke at aol.com
>>Sent: May 18, 2011 2:15 PM
>>To: dfcex at pacbell.net
>>Cc: detomaso at realbig.com
>>Subject: Re: [DeTomaso] Oil Smoke From Breathers
>>
>>In a message dated 5/18/11 4:05:46 AM, dfcex at pacbell.net writes:
>>
>>> If I still have this issue, how does one test for valve guide or valve
>>> stem seals (with the engine together)?
>>>
>>Dan, once in a while, someone will put a PCV valve in a rocker cover
>>upside-down (they fit either way), and high rpms will fill the cover with 
>>enough
>>oil to allow a mis-installed PCV to suck PINTS of oil into the intake by
>>vacuum and blow it out the tailpipe! The fix is to install the valve 
>>correctly.
>>But smoke from a tailpipe usually means oil got into the combustion
>>chamber, and there are only two paths: past the rings, or past the seals, 
>>guides
>>and valves. Oil or heavy deposits of carbon on a sparkplug will confirm 
>>oil in
>>the combustion chamber. A leak-down test will confirm or eliminate the
>>rings as the leaky source, leaving only the guides. But there really is no
>>external test for bad seals. Someone's gotta go into the suspect set of 
>>valves,
>>pull the retainers & maybe the springs and examine the seals and guides. 
>>And
>>once you do that, its very little more trouble to replace them. I like
>>Perfect Circle all-teflon seals, but there are others. Sometimes, pulling 
>>the
>>intake and exhaust manifolds will allow examination of the ports behind 
>>the
>>valves; carbon build-up there almost always means leaking seals. With race
>>cars, ENGINES are regarded as consumable assemblies!
>>As to what else may be causing it, worn guides are a fact of life for
>>performance engines but poor valvetrain geometery will make guides wear 
>>faster by
>>putting more side-thrust on valve stems. Very high rpms will also do it.
>>Then the worn guides take out their seals and you get smoke. Good luck- J
>>Deryke
>>
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