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Weil Mclain HE Series 3 blower motor replacement
Hey everyone, moved into an old house with an old (circa mid 80s) Weil Mclain HE Series 3 boiler. Had to turn it on for the first time a couple of nights ago, and when I did so, noticed the system pressure was ~3 psi. Today I purged the air and refilled it so it's now just under 15 psi. That worked as intended and went smoothly.
However, I'm also having issues with the blower motor, which I optimistically hoped would subside once the system was refilled, but didn't. It looks like it was replaced at some point (no idea when) since the original part number given in the manual is a Weil Mclain 382-930-225 and the motor currently in the boiler is a Fasco 71621335. It sounds (and smells) like the motor is just grinding metal on metal. I've linked a video of it running (sounds awful, you've been warned), as well as an image showing the model number.
Is my guess that the blower motor and (probably) the blower wheel need to be replaced accurate? If so has anyone done a replacement of this part? Any quirks I should be aware of?