How to Replace the Key for a Tecumseh Flywheel

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The flywheel on your Tecumseh engine rotates the engine's crankshaft. The flywheel is held on to the crankshaft via a flywheel nut and flywheel key on the top of the crankshaft. Overtime, the flywheel key will wear out, or if you suddenly stop the crankshaft of the Tecumseh engine -- such as when a mower blade hits a tree stump -- the flywheel key can shear off. Replacing the flywheel key involves removing the flywheel with an assistant and a few special tools.

Things You'll Need

  • Sockets and ratchet
  • Flywheel holder
  • 3-arm gear puller
  • Flywheel key
  • Remove the flywheel shroud from the top of the Tecumseh engine. Use the proper-sized sockets to remove the bolts around the outer edge of the shroud. Pull the shroud off to expose the flywheel.

  • Place the flywheel holder on the outer fins of the flywheel. Have your assistant fit the correct-sized socket on the flywheel nut in the center of the flywheel. Hold the flywheel holder firmly as your assistant unscrews the flywheel nut.

  • Fit the 3-arm gear puller under the outer, bottom side of the flywheel. Tighten the center bolt of the gear puller down with a proper-sized socket. Eventually, the downward pressure will pop the flywheel up and free.

  • Pull the flywheel off the crankshaft.

  • Pull the old flywheel key out of the crankshaft. Place the new one back in the crankshaft groove.

  • Place the flywheel back on the crankshaft so the groove in the flywheel hole lines up with the flywheel key.

  • Place the flywheel holder on the fins of the flywheel and hold it firmly. Have your assistant tighten the flywheel nut with a proper-sized socket.

  • Replace the flywheel shroud and tighten all its bolts back into place.

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