Moonshining
Well-Known Member
I'm replacing a cracked exhaust elbow on my Lombardini engine this weekend. Is it recommended to use a sealant of some sort between the (new) gasket and the exhaust manifold and the new elbow or should it not need it?
Exhaust elbow gasket sealant?
- Thread starter Moonshining
- Start date
macd
Well-Known Member
The general idea (not confined to exhausts) is that you have a gasket, or an O-ring, or a copper washer or whatever or you use sealant if so prescribed by the manufacturer. The fact that he supplies this particular gasket tells you all you need to know.
JumbleDuck
Well-Known Member
Agreed, though I am a great believer in a light smear of copper grease on gaskets,
30boat
N/A
You won't believe this but silicone gasket sealant works perfectly for this purpose.That's what I used on my 72 Triumph Trident and it gets a lot hotter than a marine engine.
macd
Well-Known Member
If Triumph had designed it properly instead of cobbling together 1 1/2 Daytonas, you might not have needed the silicone. Mind you, I do have a soft spot for 'em, having raced a Slippery Sam rep.
cryan
Well-Known Member
If it is a copper or soft metal gasket then you don't need sealant. If it is made of gasket material (the stuff that looks like card) hen a coating of copper grease it usually sufficient and will make removal much much easier. If the surfaces are not quite perfect and you think there might be a risk of leakage then use a gasket compound that has a decent temperature rating. On uncooled exhausts Fire Gum or other exhaust pastes are good but I don't think a water cooled elbow would get to the required temperature to cure them?
Moonshining
Well-Known Member
Thanks for the responses, chaps. The gasket is metallic rather than card-like so I guess the answer is that I shouldn't need a sealant, but a coat of copper grease isn't going to do any harm.
Bilgediver
Well-Known Member
Definitely +1 also on the threads of studs and nuts. Will make life easier next time.
Halfords sell it.
