Home › Forum › Ask A Member › 1951 Johnson QD12 lower unit won’t drop › Re: 1951 Johnson QD12 lower unit won’t drop
December 11, 2017 at 3:08 pm
#68492
quote Bob D:
Thanks Jeff, so far have tried with the motor hanging upside down with the shaft in a vice, PB Blaster, Aero Kroll, heat from torch, tapping with a brass hammer on shaft,and a air hammer. No luck so far. I’m now going to put it over to the side of the shop (maybe if I don’t see it I won’t get annoyed!) and let it sit with liberal use of 50/50 ATF and acetone.
I guess the next step if the 50/50 doesn’t work would be to drill a hole in the center of the shaft and make a homemade puller arrangement.
The strange thing is that the motor is in nice shape, decals, paint etc. When I finally got the lower unit down, even the impeller looked good, and the lower unit oil was in decent shape.Not knowing the history of the motor I wanted to change the impeller just for safety sake, and that’s where the trouble started.
it only goes to show the problems that can occur when you take a shortcut,and don’t grease the top of the driveshaft whenever you drop a lower unit .
I guess the next step if the 50/50 doesn’t work would be to drill a hole in the center of the shaft and make a homemade puller arrangement.
The strange thing is that the motor is in nice shape, decals, paint etc. When I finally got the lower unit down, even the impeller looked good, and the lower unit oil was in decent shape.Not knowing the history of the motor I wanted to change the impeller just for safety sake, and that’s where the trouble started.
it only goes to show the problems that can occur when you take a shortcut,and don’t grease the top of the driveshaft whenever you drop a lower unit .
The air hammer won’t be very effective using it at the bottom of the driveshaft. Pull the powerhead off so you can get at the driveshaft with the air hammer up next to the seized splines. Applying downward pressure on the powerhead (while hanging upside down in the vise) while using the air hammer on the upper driveshaft has worked for me a few times….