The engine is only 8 hp. It is a 19D Briggs & Stratton with the heavy flywheel. The initial attempt to remove it, was the two bolts close to the shaft. One bolt broke flush into the flywheel. An attempt to drill through that bolt allowed the drill bit to wander and it broke. The drill end was picked out.There is still mess to secure a pull close to the tapered end of the crankshaft. He has tried heat and various outside pullers ( would have to have jaws expanding over 9 1/2") and then coming behind the flywheel. It is all one piece. I know that 9 1/2" doesn't seem much but there isn't any space for thick jaws to get around it.
Dang. The way is, to weld into the broken stud and pull from the center. Same deal but heavier. Tapered shaft, been on there 50 years.
Questions: and answers maybe. While welding the stud there will be so much concentrated heat close to the shaft, it may release. The ground or return must be placed close to the electrode, for it may try to weld the shaft. It would certainly excite it

At this point, he has heated the flywheel and used all manners of penetrant.
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