Re: changing the water jacket gasket on a 1985 merc 50hp
Probably not. Classic problem with OB engines. Either get the right wrenches or pull the power head. I changed the gasket on my 115 tower and on a 70 rude and managed with the right wrenches.....boxed end, a hammer for "torque wrench effect" on the wrench and a good dose of penetrating oil.
HTH,
Mark