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    Merc 500 occasionally dies when giving it gas

    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...
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    '69 Merc 500 Piston replacement

    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...
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    Evaluating piston condition on Merc 500

    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...
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    Merc 500 with low compression on 1 cyl

    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...
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    Mark 55 Magneto Lube ?

    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...
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    Mark 55 lower lube question

    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 -...
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