1992 Johnson 30hp gear case fill and drain plugs are stuck

[Howurd]

I recently bought this boat with a 1992 30hp Johnson and i am attempting to change the impeller and the gear case oil. The fill and drain plug on the gear case are completely stuck. I have big screwdriver that fit the screw heads good but man these things are stuck. This boat and engine have been sitting outside for years so i am sure that doesn't help. Any ideas on getting these screws out of the gear case??

 

[hardwater fisherman]

Use a hand impact screw driver that you strike with a hammer. Or try locking a pair of vise grips on to the handle of your screwdriver. That works for me.

 

[boobie]

Get an impact screw driver with the right bit. I've always used one and never found a drain plug screw I couldn't get out.

 

[Howurd]

Thanks guys!! I actually have a impact screw driver that you hit with a hammer but i might need to find a bigger bit for it. I will give it a go.