Hi Guys I have a Johnson 115 V4 1977 115el77 on the back of my 17ft Cruisecraft runabout, while out the other day the alarm buzzer came on and the engine was overheating, I was in the middle of getting unstuck of sandbanks where I had been grounded for a couple of hours.<br /><br />The engine stopped and wouldnt restart (Not seized)I had to be towed back in, the buzzer sensor plastic or rubber surrounds melted in the head cover so it must have been pretty hot, back home I noticed one of the water hoses to the cylinder water jacket had come off. I have done a compression test (while cold)<br />Starboard were 122 top and 122 bottom <br />Port side where about 110-115 top 105 bottom<br />This is pushing the 15 psi varience mentioned in other posts, but still above the recomended 100psi on all 4 cylinders, the motor did start when i tried today after compression test but I turned it straight of due to a hose being still loose, after that it wouldnt restart.<br /><br />Would this show a blown haed gasket or could this be due to a need for a decarb or something like that, I plan to do the impeller and thermostat as the motor was running hot anyway according to the temp gauge, but the day before this happened I had just purchased a $2000.00 new boat trailer so funds to spend on the boat are very restricted for a while so want to get away as cheaply as possible. Any feedback would be greatly appreciated.