I'm planning on swapping my lower unit on my 1972 johnson 100HP V4 electric shift. I obtained a spare lower unit on ebay. I pressure tested it, and the solenoids ohm out okay, oil looked clear, no metal in it. However... before I swap lower units and put the boat back in the water, I wanted to know if there is a quick hand turn test to make sure the gears are okay.
with the gear oil drained- is it normal for me to be able to turn the drive shaft in either direction and see the prop turn, and likewise if I turn the prop shaft it too can turn in either direction and the drive shaft will turn? If I turn the one shaft cw, the other turns cw, if I turn one shaft ccw the other turns ccw. Sometimes if I turn the prop shaft by hand clockwise, it will skip ever revolution or so - like a cog is popping over. My recollection could be bad, but the last time I hand tested a prop shaft, I could turn it in one direction but not the other. Granted that lower unit was full of gear oil and the water pump/impeller was installed. This lower unit has no oil in it, and the impeller/housing happens to be off.
If anyone can suggest to me what kind of movement should be normal if I turn the drive shaft or the prop shaft in either direction that would be great. Also let me know if I need to fill it with gear oil to do the hand turn test you are suggesting.
I just dont' want to go to the trouble of swapping my lower units if this was is no good.
with the gear oil drained- is it normal for me to be able to turn the drive shaft in either direction and see the prop turn, and likewise if I turn the prop shaft it too can turn in either direction and the drive shaft will turn? If I turn the one shaft cw, the other turns cw, if I turn one shaft ccw the other turns ccw. Sometimes if I turn the prop shaft by hand clockwise, it will skip ever revolution or so - like a cog is popping over. My recollection could be bad, but the last time I hand tested a prop shaft, I could turn it in one direction but not the other. Granted that lower unit was full of gear oil and the water pump/impeller was installed. This lower unit has no oil in it, and the impeller/housing happens to be off.
If anyone can suggest to me what kind of movement should be normal if I turn the drive shaft or the prop shaft in either direction that would be great. Also let me know if I need to fill it with gear oil to do the hand turn test you are suggesting.
I just dont' want to go to the trouble of swapping my lower units if this was is no good.
