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<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 > ******************************* > > ------------------------------------------------------------------- > Search old messages on the Web! Visit http://www.vwtype3.org/list/ > </x-charset>