Reply To: Top shaft seal leaking of 1967 18hp Evinrude

[Don]

Mumbles wrote:

In the photos it looks like a gouge in the side of the seals bore. Possibly caused by a previous attempt at removal?

Best to repair this as any leaking here will allow air into the motor causing the top cylinder to run lean and no amount of carb adjusting will get it to run right.

Perhaps I am not looking at the same picture as you, not sure.  But, what looks like a “gouge” in the crankcase casting is actually the “port” where the low pressure is applied from the intake manifold.

Again, might not be looking at what you are describing…