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Noisy lower unit gears

nassto

New member
I just paid my local marine mechanic to transfer the gearset from a mercruiser lower unit that had a crack in it to pristine lower unit I had purchased. I have not filled it with oil yet and have not installed the water pump. When I spin the input shaft the gears sound like they are not meshing well but if I lift up on the shaft and turn it all is smooth. Maybe there is nothing wrong and since you can't spin it easily with the water pump on I have no point of reference. On the other hand I would hate to put this thing together and then have it howl. Could the mechanic have shimmed something improperly? I am attaching a video, note how it gets quiet when I lift the shaft and spin it. Thanks for any feedback.

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