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SV: SV: [T3] White exhaust? Oil consumption

<x-charset ISO-8859-1>I agree!
I was thinking of the "early stage" of this decease, when only a slight puff
of blue appears when you lift your foot off the pedal, or change gear. The
engine can still be running for quite some time. Of course, a car with this
symptom shouldn't be pushed too hard.
If the guides are very worn and you are fogging the neighbourhood blue
almost all of the time - then its really serious, as Jim so well points out
below. A valve job should be executed immediatly.

/Karl-Olov Sandin

> -----Ursprungligt meddelande-----
> Från: Jim Adney [mailto:jadney@vwtype3.org]
> Skickat: den 1 november 2001 03:13
> Till: type3@vwtype3.org
> Ämne: Re: SV: [T3] White exhaust? Oil consumption
> On 31 Oct 2001, at 9:56, Sandin, Karl-Olov wrote:
> > Blue smokepuffs during deceleration by closing the throttle, I think
> > indicates worn valve guides.
> > The intake vacuum raises high while decelerating and the 
> oil gets sucked in
> > through the valve guides.
> > Am I right here?
> > If so, Keith is right - thats no kritical problem (only 
> unpleasant for the
> > cars behind you...  ;-) )
> > An engine with this symptoms might still have a long lifetime left.
> I think worn guides are worth worrying about. This means that the 
> valves don't hit squarely on the seats, which produces a bending 
> torque on the heads, and also means that they take slightly more 
> time to seat, leaving less time to cool against the head.
> I'd be concerned that such a valve might fail in a way that was 
> catastrophic to the engine.
> -
> *******************************
> Jim Adney, jadney@vwtype3.org
> Madison, Wisconsin, USA
> *******************************
> -------------------------------------------------------------------
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