Re: 1963 Murcury 50hp Lower Unit
Check the threads New Impeller and New Impeller (blues) II on this board. Good info on this very subject. In the meantime, try this: put your shift lever in forward on the box, put some grease on the driveshaft and on the shift shaft on the lower unit, tun the shift shaft until the prop shaft ONLY ROTATES CLOCKWISE. Put your lower unit on and check for all three gears: prop should freewheel easily in N; rotate only clockwise in F and rotate only counterclockwise in R. And steelespike is right of course, next step is to go to Ebay and get a good Merc service manual. I found one there for about $30.