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Grinding 1999 9.9 mshx marine outboard

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  • Grinding 1999 9.9 mshx marine outboard

    I have a 1999 9.9MSHX outboard that people think is a diesel because of the 'grinding' sound it makes. Bought it used 8 years ago and it's always sounded this way. Runs like a top!
    My question. I have been told that the main bearings are going.
    Can I order the upper and lower bearings with all seals, spacers etc and have them replaced without replacing the crankshaft?
    Since it runs fine, I'm assuming my crankshaft/pistons are ok.
    What other issues might be associated with plan for repair?

  • #2
    Older 2 stroke outboards generally make grinding, clicking, etc. noises....since it's running fine maybe just don't worry about it....

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    • #3
      Thanks Mr. Graham. It seems the grinding is getting worse is all. Would rather spend $200.00 for the parts than $600.00 for a new crankshaft. I like to get the concensus of many before making my decisions. Not so easy to row an inflatable. I appreciate your quick response.

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      • #4
        You should open it up to see what all is wrong with it before ordering parts.
        I pulled my C40 apart thinking I had a lower bearing making noise and 3 out of the 4 were bad.
        Had to send the crank off to be redone in NC.
        Not many places do this to the press apart cranks

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        • #5
          Ms. Kitty's Yamaha

          Perfect idea. Sometimes I try to put the cart before the horse. Just harder to get parts down here. Thank you!

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          • #6
            Just be aware that on a 15 year old motor that some nuts/bolts/fasteners may be corroded in the threads and break off upon removal...maybe/hopefully not, but it could be a challenge. Heat can be applied or a product called Freeze-off in a can to blow very cold on a fastener to help loosen it....All this especially if your motor was used in salt water....good luck!

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            • #7
              Thanks Mr. Graham. That had crossed my mind. It has been in salt water so will open it up hoping for the best. Have not seen the Freeze-off down here. Have a heat gun and an outdated fire extinguisher, lol, along with various things like PB Blaster, Screw loose, etc that might help. Hope it doesn't turn into a can of worms as these things do. Will post results. Luckily, I have a friends outboard as a loaner. Thanks again.

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              • #8
                I use LP Propane, but it is better to use MAP gas, burns hotter. remember , heat and cool, the more the cycles the better. Don't think the heat gun will get hot enough.

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