Re: Vintage Mercury HP

[20mercman]

On a KH-7, it is basically the same lower unit (some differences) as a Mark-20 and Mark 25. The cover on these full gear shift lower units is right hand thread. You should either get a good spanner wrench, but the best thing is to make a tool. Get a round block of steel that you can drill 4 holes in it that match up with the holes in the water pump cover. If you do it right, you can use the same block and drill another set for the prop shaft nut also. Get some roll pins that fit into the holes in the cover and use a pipe wrench on the block. This is what I have made, and it works great. If the cover is stuck, you may need heat to help loosen it up.

Steve