Re: 1951 Johnson QD12 lower unit won’t drop

[Don]

Be sure to avoid the temptation to clamp vice grips (or similar tool) to the lower portion of the driveshaft for pulling/yanking, etc. Grabbing the driveshaft in this area will destroy the seal and bushing surfaces on the driveshaft leaving it useless. It is best to pull the powerhead/driveshaft off the exhaust housing if "gentle persuasion" wont release the driveshaft.
Once off, you can clamp the upper part of the driveshaft and attack it with an air hammer to loosen up the splines.