I have a johnson 1976 115hp model # 115etl76g<br /><br /><br />I have a manuel and it does not go over rebuilding pistions.<br /><br />All I want to do is replace the seals in the pistons. <br /><br />The top of the piston unscrews. What tool do I unscrew it with? <br /><br />Is there a manuel I can get that tells how to do this?<br /><br />Thanks for all the help.