Date: Tue, 22 Jul 2003 18:08:49 -0300
From: Dexter J <lamealameadingdongnopsamlamelame.org>
Subject: Re: Smokin' exhaust - more info.....


Salutations: Grunff wrote: > > Andy Evans wrote: > > a mechanic has diagnosed this problem - oil burning in the exhaust at idle, > > then going away (or not being obvious) at higher speeds - as hardened rubber in > > the valve seats (is this the correct term?). Oil would drip on idle but less so > > at higher speeds because of the vacuum. does this sound like the problem? I'm > > about to put it into mhis hands. He seemed pretty confident, though we only > > spoke on the 'phone. > > Not valve seats, valve stem seals. Valve seats are made of > steel, not rubber. > > Andy, there are only a few things that could be causing your > problem: > > [a] If the smoke is whilte and billowy - fluffy white smoke that > lingers - then it can only be the head gasket. No ifs, not buts, > only one possibility. > > [b] If the smoke is greyish and disperses quickly, and smells > bad, then it's burnt oil. This could be caused by either worn > valve stem seals, or a worn turbo. It isn't easy to tell which > until you take the head off. > > Any decent garage should be able to tell you whether it's [a] or > [b] - all it takes is a compression test. But either way, the > next step will be to remove the head. > > -- > Grunff Now that's interesting - I assume a leak down test before pulling a head off and usually a flux when it's out.. But - I almost always have had to take the head off (and usually do the rings) by the time I felt I needed the leak down - more often than not the flux has been extraneous - but still comforting.. My thinking here is - as it might well be just the seals - I thought you could (carefully) replace them with the head on if the leak down indicates nothing else.. Equally - I never call burnt oil as smelling as bad as coolant and/or coolant additive.. But I've not burned any synthetic, so I don't know what that's like yet.. I don't mean to disagree and I always differ to brother Grunff on these ones - however - isn't it be worth the final test before it's head comes off - or is it superfluous given the symptoms?.. -- J Dexter - webmaster - http://www.dexterdyne.org/ all tunes - no cookies no subscription no weather no ads no news no phone in - RealAudio 8+ Required - all the Time Radio Free Dexterdyne Top Tune o'be-do-da-day Tractors - Setting the Woods on Fire http://www.dexterdyne.org/888/085.RAM

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