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DISCUSSION => Engine + Driveline => Topic started by: PaulC on December 17, 2007, 05:54:03 PM

Title: thermostat gasket
Post by: PaulC on December 17, 2007, 05:54:03 PM

Is the flat gasket between the connection flange and thermostat (#8 in the diagram below) OK by itself in there or should I use a little sealant?
http://www.realoem.com/bmw/showparts.do?model=AF93&mospid=47305&btnr=11_0559&hg=11&fg=35
Any other tips are much appreciated.

Thanks
Paul

'91 318is

Title: thermostat gasket
Post by: sumyungguy on December 17, 2007, 06:07:54 PM

I put some Hondabond on both sides of the gasket just to be extra sealed.

Here is the dilemma I went through.  (http://www.m42club.com/forums/showpost.php?p=38047&postcount=102)

Title: thermostat gasket
Post by: D. Clay on December 17, 2007, 06:21:16 PM

I've always used O-ring #7 also. I'm a believer in Hylomar and Antisieze. It's available at:http://cgi.ebay.com/ebaymotors/Hylomar-Universal-Blue-Racing-Formula-35-ml_W0QQcmdZViewItemQQcategoryZ107066QQihZ001QQitemZ110164847315
It's amazing, seals great, and cleans up with acetone.

Title: thermostat gasket
Post by: haledj on December 17, 2007, 06:25:15 PM

You can put sealant around the outside, but don't put it on the middle strip.  Air needs to get through that tiny little passage to bleed the system easily.

Title: thermostat gasket
Post by: PaulC on December 17, 2007, 06:41:50 PM

Thanks very much. I got a new o-ring (#7) along w/ a new 88deg thermostat. The new gasket I have has a thin bead (about 1mm) on the inside already. I haven't removed the connection flange yet, but I remember reading in another post about the bleeder passage, which I'm guessing is what the notch cut out of the inner ring of the gasket is for(?).