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  1. 7

    Tach connection

    Hi, I have a 1970 mercury 500 50 hp motor and I just bought a tachometer for it, in my book in the wiring diagram it says I am suppose to hook the pulse wire up to the blue terminal of the switch box but it does not work that way, is there another way to hook up the tach or can I hook it to one...
  2. 7

    Lower unit

    Hi, I was wondering if anybody knew if a lower unit from a merc 1969 500 50hp will fit a 1969 Merc 800 serial # 2665599. I was also wondering how you tell if you have a shortshaft or a longshaft do you measure the driveshaft because mine is 17" is mine a short shaft or a long shaft. Thanks
  3. 7

    Pistons for merc 500 50 hp

    Hello all you boaters and boatettes, I was wondering if anybody out there had an extra piston they would like to sell me I cant find one on ebay and mercury wants $138.00 for a brand new one and I cant really afford that after Christmas took all my money and credit cards, so if anybody could...
  4. 7

    Water pump on a merc 500 50 hp

    OK, I have some problems with my water pump on my merc 500 50hp. I have just changed the water pump impeller and the whole housing because everything was really shot, and when I hook up a water flusher to the engine it doesnt pump water out of the tattle tale hole, someone told me that the line...
  5. 7

    timing marks

    How do I time a 1969 50 hp merc 500 it has a manual start with a type two ignition system. It has two timing marks on it. When putting the distributor adaptor on how do align the marks does one go to the timing mark on the frame and the other to the timing mark on the adaptor gear. Any help...
  6. 7

    Merc 500 50 hp 1969 lower unit

    How do I get this lower unit back on,I mean what do i do with the gears. I have a book for it but it doesnt really help me. I just rebuilt the water pump. Any help would be appreciated. thanks, Shane
  7. 7

    NEED INFO ON MOTOR

    I have just bought a boat with a merc 500 50 hp engine but do not know the Serial#. Because there is no label on it wich makes it hard to find parts for, if anybody could help me out it would be greatly appreciated. The engine looks kind of old, its a manual start motor if this helps any...
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