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On 16 Feb 2005 at 14:58, David Sanderson wrote: > I am looking at this stock exhaust system and wondering how much I > need to keep. Specifically, there are two small heat exchangers that > link the rear exhaust to the muffler. These are shown on Dave Hall's > site <http://www.hallvw.clara.co.uk/type3/T3pbo/T3pb2-12.htm > as > number 8 and 9. There appears to be a washer of some sort that fills > the gap and ensures that the exhaust actually makes it into the > muffler. Also, coming off these is an outlet that ties to the fan > housing. I gather than this has something to do with monitoring > engine temperature. Those gaskets have been discussed here before. Someone mentioned that you could make them by cutting off short pieces from a certain size of copper pipe. I haven't done this yet, but it sounds like a good idea. The fan blows air INTO the heat exchanger, from there it passes into the lower heat exchanger and forward into the car, when needed. > On mine, the fitting of these exchangers to the muffler is very loose > and floppy. I have managed to get one off but cannot get the other > off. If the muffler is old you may not be able to get this loose without destroying the muffler. A solution is to just install the muffler loose, and then, once everything else is nicely in place, drive it to a muffler shop and have them weld the muffler tube to that hex nut. DON'T weld it to the body of the little heat exchanger! > So, those of you not running a stock muffler system what do you do > with this component? and ho do you route air into the fan shroud? Aftermarket exhausts come with flimsy little flex tubes that run from the fan housing directly to the lower heat exchangers. These tubes eventually either fall off or abrade thru the side from rubbing on something. If you don't need the heater and you want an aftermarket exhaust, you're probably better off going with a pair of J-tubes and just blocking off those outlets on the fan housing. If you do this, make SURE that you block off the outlets with something reliable, otherwise you stand a chance of losing a LOT of cooling air that the engine might want. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~