I Recently was given my grandfathers 1971 StarCraft boat with the original 1971 60 hp Evinrude outboard engine. I know some of the history on the engine, but it has not run since roughly 2001. The boat and engine have been well taken care of and it has been stored indoors since its last outing. I am going through the engine. I have read many of the blogs on this site and have found it all very useful and informative. It was suggested that I change the impeller amongst many other checks prior to even starting the engine. I have the original service manual and I have followed the instructions on removing the gearcase (lower unit) to access the water pump and impeller. After removing the bolts the gearcase isn't smoothly coming apart from the exhaust housing. Any ideas or suggests would be appreciated.