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    1973 Mercury 850 Free Spinning Lower Unit Shift Shaft.

    I have a 1973 Mercury 850 that I just go done replacing the water impeller and key on. When I went to put the lower unit back on, I had my shifter in neutral and my shift shaft position in neutral. When I started tightening the bolts to hold it together I was receiving a bit of resistance when...
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    1970s (I believe) mercury 850 with thunderbolt ignition. Having cooling system issues

    I have a Mercury 850 4 cylinder with the Thunderbolt ignition system that is overheating. I was out all day fishing at the local lake driving all over with no problems. After I dropped my friends off at shore, I headed to the boat dock at full power when the motor died at full speed. I...
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