[seacamper]

Hello All,
I have a 73 40 hp (#40el 73d) that is project. I bought it "running" from a fellow who seems to have patched it together. I did a compression check (with good compression) and when I pulled the tester out, the spark plug threads came with it. I got a new head and gasket. When I torqued it down, water came out of the gasket in a fine spray. I tightened the head slightly and it still leaked. I ordered a new gasket and re cleaned the cylinder face and noticed a very slight "depression" on the surface of the cylinder. Is there any trick to filling the depression? I was thinking of putting a thin coat of JB weld on the cylinder surface in the "depression" and then sanding it off to get the cylinder surface flat enough to hold water. Any ideas? Should I just use some type of super gasket cement instead? It does not seem to affect the compression, just the water side.
Thanks, Tom

[F_R]

If you are talking about just the outer, water jacket surface and not around the cylinders themselves, then JB or Marine Tex or something similar should be OK.

[seacamper]

Originally Posted by F_R

If you are talking about just the outer, water jacket surface and not around the cylinders themselves, then JB or Marine Tex or something similar should be OK.

Yes, it seems like just the outer water jacket.