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.
This is probably what happened. I took pictures but they’re too big to post. I measured the length of the crank snout and the length of all the parts. After subtracting the flywheel length, point cam thickness and carbon seal, there is only .0905 left for the 2 brass washers and the spring. I don’t think that’s enough.
This causes me to ask the next question…is there a spacer that goes under the flywheel nut? As it sits now, the flywheel sits almost flush with the last thread on the crank. No visible cracks in the flywheel. I don’t have any gauges to measure the ID of the tunnel.
Anyone have a good flywheel for sale?
Thanks for all your help and consideration. This was driving me nuts.
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