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  1. H

    63 merc 650 copper water tube/overheating question

    So far on this motor I have replaced:<br />prop shaft seal<br />water pump base seal<br />water pump and all gaskets.<br />Still have water in oil so I am in process of replacing shift shaft seal. I have recently treated this motor with seafoam. <br />When I pulled the lower unit this time I...
  2. H

    Decarboning(sp?) a motor

    I read in another post about decarbing a motor with seafoam. What is seafoam? Can you damage a motor by using it. In this particular post it said that they gained a 5 psi per cyl. I have a 63 merc 650 and compression ranges from 130 to 115. Could this even up the compression?
  3. H

    63 MERC 650 Lower Unit

    Just bought boat. Ran it twice. Pulled lower unit and replaced impeller. Motor runs great. Thought it would be a great idea to replace gear lube. Removed drain screw and vent and all I got was a few drops of water :( Filled with lube and noticed that the seal behind the prop is blown out. My...
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