deadndwater
New member
I finally received a replacement lower unit for my damaged NS 70 A2. I took apart the water pump to replace the impeller. I noticed that the drive shaft was not turning too freely no matter what position the shift rod was in. I took apart the remaining components and found that the nut that holds the main drive bevel gear had come off and it was now in pieces in the case. All other gears look okay as does the dog clutch, etc. Upon inspection, the threads on the drive shaft are damaged, most likely due to the nut coming off. Does anyone know the size of the threads / nut? I have a replacement nut from my original lower unit, so that's no problem, but it won't thread on due to the damage. I am assuming that I can repair the threads on the shaft with a metric die. I have only SAE dies, so I need to know what size die to buy....? THANKS