hi guys.i have johnson V4 60 hp VX-13A engine that is past do its maintenance.i want to change the seals in gear case,as i found milky oil when i put this engine in storage 2 years ago.now am back at it.lover unit is already off the engine and i removed water pump,and drained new oil so far.i need help with next steps to get seals changed.sael kit for my engine that i got is 18-2689.do i need any special tools to do the job.hope that its not too complicated.