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Re: Plume of Smoke (was: [T3] Various Questions)

On Thu, 2003-11-13 at 23:43, joshua brooks wrote:
>    I recently took apart a type 3 engine with valve stem seals on the heads. 
> It was a high milage engine and the valves were shot but the seals were 
> still supple and seemed to be in good condition. I asked my local vw parts 
> house about valve stem seals and they said they hadn't been offered in years 
> because they weren't needed with modern valve guides. Later I thought to 
> myself,"What if the valve guides wear to the point that they leak some oil 
> but still do their job?". I think valve stem seals would be a good idea just 
> in case engine conditions make them beneficial. I would guess there are some 
> valve stem seals in production that would fit the type 3 engine.

I worked for VW for over 30 years, rebuilding engines for 20 yrs, and
never saw a "valve seal" on an air cooled VW engine. They had a square
looking o'ring that they put on the valve stem, but that was to push oil
into the valve guides, not to keep it out. If you have a valve guide
that is worn enough to pass oil, you can expect a broken valve in the
near future.
Any smoke on start up with a VW air cooled, is caused by oil seeping
past the rings when it is shut off. Parking on an angle and such. My '71
smokes a little on start up, but then it has almost 120K miles on it.

Russ Wolfe
'66 FB MT
'71 FB AT 
'65 Bug (not running)

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