This is kind of a follow-on to Lennky's 7/5 post, and Chris1956's reply, but with an "occasional" twist. Pardon the long history -I thought it might be important.<br /><br />I just completed a tear-down of a 1969 Merc 500 (acquired last year on eBay - never had it running) to see why it would...
I need to replace a piston on a 1969 Merc 500. I figured I would be better off with a used piston then a new one not only because of price, but because when measuring mine vs. a new one, it seemed the new one was about 1/2 mm larger in diameter than any one of the 4 of mine (yes, I verified the...
I have low compression on 1 cylinder of 1969 Merc 500. I removed the intake covers, and saw that 3 of 4 cylinders looked clean and the rings are loose enough to depress when pushed on (compression in them was 120, 115, 120). <br /><br />The piston in the cylinder with lo compression (30) had a...
BACKGROUND:<br />I recently purchased a 1969 Merc 500, SN:2629914, that was supposedly in good shape with good compression, and used consistently thru last year, and was running this year in a barrel (I saw it (momentarily - it sputtered a bit but the gas tank was almost empty)). After...
I acquired a 1955 Mercury Mark 55. Runs well, I am just trying to get it ready for this year. The magneto has a grease-gun fitting on it that I suppose I need to lubricate. The manual lubricant chart does not have my model on it, and other models say to use "New Multipurpose Quicksilver...
Just purchased 1957 Mercury Mark 55 short shaft. It ran great (as previous owner said it would) on my test run of it. Today I wanted to check the lower lube to see if any water got in. I removed what thought to be the vent hole (6" above the prop level) and a few drops of water came out -...
