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  1. C

    Mercury 850 1975 yr model prop not turning.

    I replaced the lower unit on this motor and when I started it up the prop still wasn't spinning. I put it in gear with the motor turned off and the prop locks up in forward and reverse. it spins freely when in neutral. The impeller is spinning as I get water spraying out. I am at a loss as...
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    Mercury 85HP 850 Thunderbolt lower unit compatibility

    In reference to this thread, http://forums.iboats.com/mercury-mariner-outboards/mercury-85hp-850-thunderbolt-lower-unit-compatibility-347826.html I also have a 1976 Merc. 850 that I need to remove the lower unit on. What is the easiest method of doing this job?
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    1976 Merc 850 kills when shifting into gear

    I have a 1976 merc. 850 that is really turning into a project. First I had to replace most of the wiring. I put in a new switchbox as I was only getting spark in 2 cyl. I now have another problem. The motor kills when I put it into gear. I seems to shift violently. I took off the prop and...
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