'84 OMC Sea Drive 1.6 L (I know, a Sea Drive) with approx 40 hrs on rebuild (purchased boat with 10 hrs on rebuild).<br /><br />Boat is currently in the water (and intended to be all season). <br /><br />Found motor running on three cylinders via plug wire test (no change in mtr when plug wire pulled off). Verified spark and then pulled plug and found it to be clean, verified fluid to be water not fuel. Not sure of cylinder number (left manual on boat) but it's the lower cylinder on port side, is this the infamous #4?.<br /><br />Checked compression on "wet" cylinder and found it to be low, 20 psi at best, other cylinders between 120-130.<br /><br />My questions is, should I try to replace head gasket (and or water cover gasket?) while boat is in the water, which I think is do-able, or am I looking at a more extensive rebuild?<br /><br />After all the "fun" I've had this year with the boat, I'm ready to pull the plug and watch her go!<br /><br />Thanks for any feedback
