I have a 1970 mercury 500, 50 horse. This thing is like it has been in a time capsule. I bought it from the original owner who had it stored in his basement since 1973. This thing is absolutely spotless, and I have done the normal maintenance on it getting ready, water pump, plugs, etc. Here is my issue... the motor runs great, but I'm getting some moisture on #3 plug. I have replaced all gaskets on the covers, and have done a compression, and leak down test on every cylinder. Compression gauge shows 145, and leak down is 2%. The only question is where is the moisture coming from in that cyl? Is it possible to have a crack in the cyl wall, or would the leak down show more leakage if that is true.
Thanks, Scott
Thanks, Scott
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