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Leak at thermostat 700

posted by  anastasialk on  Mon Mar 8 14:39 CST 2004
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last visit: Thu Mar 8 09:09 CST 2012
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So, I had a leak at the thermostat. Thought I took care of it this weekend by installing a new thermostat with gasket and cleaned both surfaces. Today I took a look and it is still leaking! What's up? Can I make a gasket to seal the area where the intake side of the engine meets the metal part that holds the thermostat? Any suggestions would be appreciative. It is quite a little stream of coolant coming out...

Best Regards,

Anastasia

86' 740t 366,000








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Leak at thermostat 700

posted by  chrisjul on  Tue Mar 9 00:34 CST 2004
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last visit: Sun Jan 22 20:46 CST 2012
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I've had tstat leaks several times. A light coat of RTV will solve the problem. Although its not called for in this application...IT WORKS. No problems when you replace the tstat again except the cleanup is a bit more involved.
Good Luck.
Chris








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Leak at thermostat 700

posted by  Steve on  Mon Mar 8 14:55 CST 2004
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last visit: Fri Oct 24 07:16 CST 2014
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The rubber o-ring should seal this, unless it is pitted with corrosion. If it is, clean off the aluminum with fine sandpaper and fill any pits with silicone RTV.








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Leak at thermostat 700

posted by  anastasialk on  Mon Mar 8 15:15 CST 2004
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last visit: Thu Mar 8 09:09 CST 2012
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I did use some fine sandpaper on both sufaces tonight. Cleaned surface again, installed thermostat and it still leaked. I didn't try to use any silicone RTV. I will try it again tomorrow.

Thank you!

Best Regards,

Anastasia

86' 740t 366,000








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Leak at thermostat 700

posted by  745 TurboGreasel on  Mon Mar 8 15:38 CST 2004
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As cast aluminum ages, it becomes more porus, and will eventualy leak through the housing. you may want to inspect for that , cracks, or warpage of the flange surface.








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Leak at thermostat 700

posted by  anastasialk on  Mon Mar 8 23:53 CST 2004
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last visit: Thu Mar 8 09:09 CST 2012
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I was affraid of that. Just in the sense that I am in PA right now and have a difficult time finding part around here. NH and Maine are overflowing with Volvo's in the scrap yards compaired to PA.

Thank You!

Best Regards,

Anastasia 86' 740t 366,00







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