How to pull lower unit on a 1968 15GG-9015 Gale Seaking outboard to replace impeller

[blewis2121]

I am trying to replace my Impeller on my Outboard. I have removed the 4 bolts on the lower unit and the unit will pull out about approx 1/2 inch.
Base on some other research thought there might be a small screw inside I might have to remove, but I have found nothing. I have not been able to fine a manual or motor diagram yet for this motor. Just bought this motor which will start up nicely but wants to overheat.
Thanks for reading and any assistance.
Brad

 

[racerone]

What horse power ?----Post a picture of the lower unit.----Is there a wee cover on the side of the exhaust housing ?

 

[blewis2121]

It is a 5hp. Not sure what wee cover is? but i hope these pics help.