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Re: [T3] Valve stem seals ?


On 7 May 2006 at 3:14, Russ Wolfe wrote:

> BTW Jim, You don't know everything.

I agree wholeheartedly, but I'm just not convinced on this issue.

I understand that your official VW training taught you that these 
were there to push oil into the valve guides, but why would VW need 
to push oil into their valve guides when every other engine maker 
goes to great lengths to seal oil out?

In addition, it seems to me that the source of the oil is at the stem 
end of the valve (where it's deposited from the rocker arm) so oil 
would have to climb over this "seal" to get to where it could be 
pushed into the guide. OTOH, I would agree that there's probably 
plenty of oil mist around there, especially at high RPM.

I agree that the parts list description of "ring - oil deflector" 
really doesn't resolve the question.  

I know several competent engine people, and I'll try to remember to 
ask them what they think about the advantages/disadvantages of oil
in valve guides.

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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