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Date: Wed, 23 Jul 2003 17:44:03 +0100
From: Grunff <grunffnopsam.com>
Subject: Re: Smokin' exhaust - more info.....


Dexter J wrote: > Well brother Grunff - your published advise to this point would indicates > otherwise - I have yet to see a post from your node that I felt was heading > in a wrong direction whereas I can point to several of mine that most > certainly were.. You're too kind <blush>. > While I don't know if it's possible in a SAAB (which is why I asked) or > advisable for this situation - I've had a couple of seals done on another > machine with the head on by bringing the piston in question to TDC - > removing the spring and cap - then carefully removing and replacing the > seal (dental tool helps greatly).. The procedure counts on doing it fast > and making enough compression on the valve seats/rings to hold the valve in > place.. Just looked in my Bentley, and it does explicitly describe a procedure for doing the seals with the head in situ. > A bank of cracked seals at the published mileage might indicate that the > head has been (or is being) overheated - thusly - while I would spring for > the leak down just to make sure, I think that the head gasket is almost > certainly weeping and perhaps the head itself has been damaged (although > less likely).. But - while I also think the water cooled turbo is a lot > tougher than it's given credit for - all that steam could indeed be a > squeaked turbo bearing/seal as well as the valve seals.. Very true - it could easily be a combination. > Unfortunately - there are almost endless possibilities on this one and why > I was suggesting a good leak down test across the system(s).. It would certainly eliminate/confirm the possibility of the smoke being coolant derived. > I have always felt heat was a sort of achilles heel for SAABs - they, like > all good things and people nordic, seem to have very little engineered > tolerance for excessive heat - which is fair enough - that little 2.0l is > working very hard for the money.. Heck, I start flopping around the studio > and making steam every time it gets above 80F around here myself.. :) .. I'll never forget my first 900 (83 twincarb), which blew a headgasket in a major way, such that only two cylinders were firing. It still managed to get us home from Devon to London (200+ miles) chugging along at 40mph on the motorway. Took many hours, but we were very proud of it. Needless to say that way the end of that engine. > I wonder if they ever did an all aluminum block for special application > when they still had a racing team?.. Dunno, I've never heard of one, but you never know. -- Grunff

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