Can you please help me?<br />My 1977 25 horse evenrude has been leaking oil out a bottom vent hole.<br />Turns out water has got into my gear box and taking a inspection the water either got in the shifter o ring or input shaft seal.<br />Are these generaly the only two places the water can get in other then the bottom end seals?<br /><br />I am going to replace all the seals and water pump, only trouble is I dont know how to remove the imput shaft seal?<br />Scared I may crack casing?<br />Does the whole seal come out as one?<br />And should I use a pulley or give it to a engineer.<br />All replies are much appreciated, thanks