I found the noise! I took the everything apart. Wife is pissed there is no hot water.
I believe the noise is coming from where the auger rod exists the burner pot. There seems to be a worm bushing? Picture below:
The auger edges are ground down so I'll have to replace it anyway. I can't figure out how to get the auger out of the pot. I disconnected it to the gear shaft, but it doesn't want to slide back and I don't want to force it. Any ideas how to get it out when I get a replacement auger?
This wet coal really eats up the metal pipes. I'll have to drill more holes in my bin to let water out. I found both the upper and lower pipes had holes in them.