Re: 89 Johnson 9.9 cooling system obstruction

[rudderless]

When I did mine I flared the end if a new piece of copper. I turned the clamp tool over and tapped the flaired end flat against the clamp tool. This will keep any rubber from extruding over the hole. I used a short section of 3/8 fuel hose as a grommet. Had to grind the outside to fit. Pressed the tube/grommet into the exhaust tube. The hose was just a bit longer so the clamping force will compress the hose into the housing. The flaired end is against the gasket. If making own tube don’t forget the cooling hole in the water tube if not using the wet leg.