I ran the test you suggested Bert. I was able to rotate the flywheel with both hands, at a reasonably quick pace, for an average close to 15 seconds before it would lock. Once locked, no matter how hard I tried to turn it, it wouldn’t move. A few times I was able to turn it for around 30 seconds straight. However, each time it would lock, it would lock at the same spot. I’ve included several pictures that show what the ring gear teeth look like around that area. You can see where I marked the flywheel for reference. I've also included two pics that show what the teeth look like from the other side.
What do you think?
What do you think?