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The starter is spinning the pinion but not moving to engage it to the flywheel. I put it in a vise and it still does it. I only have a hot wire going to the big bolt on the bottom and a ground from the battery to the starter housing. The top portion of the solenoid has nothing wired to it. Is that the problem?
Problem Solved by Big A at the MG Experience Forum. The solenoid has to be wired as well to a hot wire as well as the bottom starter motor. If you look down from the driver side at the square solenoid,,, the pole farthest way and the pole closest must be wired through the ignition or just jumped across from under the hood. If they are not connected, the starter will whirl but will not push to engage. You can use an tractor starter button and hook one end to one pole and hook the other end to the other pole and when you push the switch it will both spin and push out to engage.