I think I've seen smoke leaking when its hot, how would I check this?
Leaky manifold/gasket
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#1
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#2you'd feel it with your hand, obviously being careful not to burn it

use some paper.. it'll flutter -
#3Is it an easy job to change the gasket?
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#4yeah, not too bad, standard manifold i take it? if so, even easier! always good to replace all the studs and nuts whilst you are at it.
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#5
