Re: Mk20 powerhead on KG-7 Tower.

[20mercman]

The bolt pattern for the front tank mount plate for the KH-7 & earlier motors is a bit different than the Mark 20. You will need to modify or make a new front tank bracket. As for the front of the drive shaft housing, as the other’s have noted, the lower bearing carrier is different. 1954 and earlier Mk-20’s used a water cooled lower bearing carrier that was two pieces. The carrier and the lower plate. Later production Mark 20’s used a one piece lower bearing carrier in the same style as the Mark 25. If you have the two piece plate, then you can do as Dave suggested and just use the lower plate from the KH/KG/KF/KE style motors to seal up the drive shaft housing and prevent the swivel pin from working it’s way up.

On a project my son and I are building, we are using an enhanced Mk-25 powerhead on the KF-7 lower unit. This lower bearing carrier is different, and I had to make a block off plate for the front of the drive shaft housing. Easy to do.

Have fun with your project!!!!!!

Steve