Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The bolt is a standard right hand thread, it is fine thread. You may need an impact wrench in order to get it loose, I have had good success using boxed end wrench and hammer to jar it loose, once loose it will spin right out with no problem. The trouble is that most of the time the entire crankshaft wants to turn when you are trying to remove this bolt.