"Factory-tight" bolt in my washer: Won't budge!

[KY_EnviroGuy]

30. They may have used something like Loctite on it.

Just one more crazy idea but you might try heating and cooling it several times, during which that cycling often breaks the bonds holding it seized. But, not very high heat which could damage the motor.

Penetrating oil sometimes helps too, with an overnight soaking. I always liked Liquid Wrench but be sure none runs down into the motor's internals.

Also, keep trying the sharp tapping on the end of a long wrench with a small hammer. That induces extremely high instantaneous shock forces on the threads. Tapping on the head of the bolt can help too, which are axial impacts vs radial.

Good luck!