Well I finely found my problem on my 82 merc IL6 90 hp. The megaphone gasket is missing. Causing a exhaust leak near the water tube and the top of the drive shaft. Problem is it is no longer available from merc. Guess I have to make one out of gasket paper and high temp silicone. Has anyone got a pic of one ? The pic from parts man. merc dealer sent me is not very good. It looks like it covers half of each port and seals tight to the exhaust tube. Is this correct? Can anyone help?