Home › Forum › Ask A Member › 1957 Evinrude Big Twin 35 flywheel keyway › Re: 1957 Evinrude Big Twin 35 flywheel keyway
It’s important to remember that the key is simply an alignment tool to correctly place the flywheel in time with the crankshaft and magneto. If the flywheel retaining nut is not torqued to the proper spec, and it’s too loose, the flywheel will float around on the crank and eventually damage the keeways and shear the key. Some of us like to use some Clover brand valve grinding compound on the tapers while rotating the flywheel back and forth to intimately match the tapers. (clean all residue of compound before final assembly) Assemble the flywheel to the crank dry. Use no lubricant between them, and always use a strap wrench and torque wrench. R.T.