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I usually just use a smear of HMP grease on both sides of the gasket and a little coppa slip on the bolts. I usually scrape clean both mating faces on the housing and the head. If the faces are in good condition then this usually works fine.
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Hi
I don't think you'll need any sealant, not unless if specifically says so on the thermostat box (unlikely).
I forgot that the thermostat housing (with switch on top) has 2 pipes coming out of it (I think), so you may have to take these off. Just jubilee clips, nothing fancy.
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Word of advice..After you have taken top off.Check with a straight edge to make sure it has not bowed..It may not have done.But can happen.Usualy when bolts are over tightned..As mfarrow said.they dont usualy need any sealant..
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Steve
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We replaced the thermostat late Friday pm - and this seems to have done the trick. As suggested, there were 2 pipes to the domed cover, but we managed to move the whole thing slightly to one side for access without actually uncoupling the pipes. The electrical plug was uncoupled which made access slightly easier. I also got cold feet and used a thin smear of Hylomar on the joint when re-assembling. A couple of points which may be useful to anyone else attempting this for the first time:
1. A friend emphasised the importance of cleaning away ALL traces of the old gasket as any remains could lead to breakage of the cast components when tightening up the bolts. The remains of the old gasket were well compacted onto the mating surfaces and did need some attention.
2. The old thermostat had been 'welded' into place by a few spots of corrosion and it took a couple of sharp blows with a hammer and old screwdriver to shift it.
Again, thanks for your comments. Waino
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