On Apr 18, 8:13�pm, wrote:
I have a 1966 50hp Mercury outboard engine. It appears that steam is
coming out of what should be where the cooling water comes out. Does
this sound like a bad impeller, bad thermostat or a plugged water
line?

Mike

if it runs rough, it could also be a bad head gasket allowing exhust
into the cooling chamber[s]