Home › Forum › Ask A Member › Johnson 1957 18hp Flywheel Problems › Re: Johnson 1957 18hp Flywheel Problems
1)Do not remove the flywheel nut completely. Just loosen it to near the top of the crank threads. I have seen flywheels pop 3 feet into the air and then fall 7 feet onto the ground when no flywheel nut is on the crank. Not a good thing.
2)Those three stove bolts are too long. They will stretch under tension. Shorter grade 8 bolts would be better.
3)Also those three bolts have no way to thread them deep into the flywheel. Hex bolts would be preferred. Bolts should be threaded evenly ALL the way into the aluminum threads of the flywheel. You definitely do not want to strip the threads out of the flywheel. Seen that too many times.
4) As Frank said, after it is set up correctly, just torque that center bolt as hard as it takes. It WILL pop. Heat around the center hub can help but it is rarely if ever needed.