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Pretty cold here right now but things could be warming up a bit next week. Not warm enough to put water in the barrel but maybe opening the door for some bench testing. Forecast that far out aren’t reliable. Could change to snow by then.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
Cant say why they had the 3rd ring. Unless there are some documents around there is no way to know for sure . However we can speculate. My first guess would be controlling the fuel charge as the piston pass over the ports. Or possibly to improve crankcase pressure. Or maybe is to stabilize that heavy cast piston so it doesn’t rock in the cylinder. Or to keep oil between the upper and lower rings for better lubrication. This is early in engine design. Things were being tried only to be dropped as they didn’t really work as intended, cost didn’t justify the benefit, but most likely, same as today, engineers have to keep coming up with something different, no matter how well something works, if they want to have a job.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
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I posted the first power head pictures before I had removed this other cylinder. When I pulled it back there was a piece of the back fire suppressor sticking out. There was just enough of it remaining to keep it from going into the crankcase. This, and water pump key, would seem to indicate this motor had a death wish. Rings, same as the other side. Freed up pretty easily except for the top ring. Stuck in the area of the exhaust port. I broke it however. Except for having around .005 to .006 of taper, the cylinders look to be in good condition. With all this carbon I’m surprised there is 0 scoring of the pistons or cylinders.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
I think this is my 5th or 6th Johnson with this power head. Didn’t have a reason the remove the cylinders in any of them. They have moved on so I can’t check if the back fire suppressor is still in any of them. I think if I get anymore of these I’ll slide at least one cylinder back far enough to check if they are still in there.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
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