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River water deposits on lower unit - what to do...

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  • River water deposits on lower unit - what to do...

    Bought a Merc outboard motor which unfortunately spent the last 3 months hanging on a pontoon in the Fox River in Chicago (always IN the water of course), it sustained some 'attack' to the lower unit finish. Nothing is damaged mind you, but the lower unit was covered with slime, little tiny red worms, and some serious water deposits. All I've done thus far was to scrub it up and get the big stuff off. No chemicals or anything. The thing is, now it hangs off the back of a completely restored little runabout, and it looks bad! Any help here?
    JoeMan
    1964 Duratech Neptune

  • #2
    Re: River water deposits on lower unit - what to do...

    You could try straight vinegar or try a lime/calcium remover such as the bathroom cleaner CLR or something similiar. These usually work for me pretty good.

    Someone else may be along shortly with more suggestions.


    Good Luck!

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    • #3
      Re: River water deposits on lower unit - what to do...

      Good suggestions for cleaning. If you want to take it further and repaint it, strip off the old remaining finish and you will likely find a green or yellow primer coat underneath. That's the original self-etching factory primer. Once there, use some non-detergent steel wool or wet-dry sandpaper to roughen up the surface a little. Then clean it soap and water, the vinegar to remove dust residue, then soap and water again. Then you can repaint it with self-etching primer and use a compatible paint to replace the original paint top coat. If you don't use the right primer and paint the finish/paint will just start bubbling/flaking off after it's been in the water a few times. Not a hard project to do...but take the time to do it right the first time if you go this route.

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      • #4
        Re: River water deposits on lower unit - what to do...

        My boat spends its time on the delaware river with similar residue minus the worms LOL I have used 409 on it for ever and it brings it back to new, granted it is not left in the water but give it a try!

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        • #5
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          Re: River water deposits on lower unit - what to do...

          Lots of great ideas. I appreciate the advice guys. I'll try the cleaning agents, and if not successful, I'll repaint her. THANKS!!
          JoeMan
          1964 Duratech Neptune

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