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  1. C

    650 drive shaft housing stud replacement

    iboaters: I am currently working on a project, trying to revitalize a 1976 Mercury 650 three-cylinder motor. I was ready to install the rebuilt lower unit, when I noticed that both studs that extend out of the drive shaft housing to connect the lower unit are in really bad shape. Threads are...
  2. C

    65 hp driveshaft collar?

    iboaters: I recently purchased a '76 Merc 650 with an old Lund I am rebuilding. The old motor started right up and produced over 120psi in each of her three cylinders, so I decided to make a run at still using her. First on my list of repairs was a new impeller, of course. I had no problem...
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