Reply To: 1963 Evinrude Sportwin weird problem

[frankr]

Don wrote:

Is the flywheel taper damaged/cracked allowing the flywheel to come down lower on the crankshaft than it should? Post some pictures of how you are assembling the carbon seal/spring/cam, hopefully it is something simple…Sorry about the damaged carbon seals…
You mention that the point cam goes below the key, so it more or less spins freely on the crank? Seems like some sort of assembly sequence error…

I think the answer was in this post. I think the flywheel taper is spread, allowing the flywheel to push the cam below the key, and mashing down on the carbon seal, thus breaking it. I’ve seen it happen before.

So what damaged the flywheel??? More than likely somebody in the past has tightened it with an impact wrench. There is a reason it must be tightened with a torque wrench. Another thing I’ve seen in the past is somebody greased the tapers, making them slippery and move downward too far. Again, there is a reason the tapers must be clean and dry.

Whatever the case, the flywheel is destroyed and must be replaced.