Small Engine Problems? Ask an Engine Mechanic for Answers ASAP
Hello, and thank you for choosing JustAnswer. I'll be assisting you today and am committed to providing clear and concise answers to your question.
It's a tapered fit to the crankshaft, no key. And there is a tool that will make the job much easier.
Part Number(NNN) NNN-NNNNImpeller Removal Tool
I've linked the part number to a shopping search, or it can be ordered from any local MTD dealer. MTD is who made the machine for Sears.
Hope this helps!