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My mom's house has a Brunham Jubilee cast iron boiler in stalled in 1969 with a newer Beckett AFG on it. It's running well but it has a positive draft over the fire, so I want to clean it but was wondering the procedure. I was only there a few minutes today visiting with my wife and didn't have any tools, so I didn't try pulling off the top, but there is a black iron pipe that goes through the top of the boiler near the flue. If I remove the flue, the top won't completely come off as there's no relief cut in the top cover to allow the top to slide away from the pipe. If the top is the way in (and I suspect it is), I'll have to remove the flue pipe and rotate the top cover around the iron pipe. On the side of the boiler is a sheet metal door with a small latch, but when opened, it only exposes the boiler sections, so I don't have a clue what that door is there for.
I plan to go back during the week with some tools and better lighting than my cell.
Is there a manual somewhere for this old boiler on line? I did not see any other nameplate except for the scripted Burnham Jubilee on it, so I don't know if there's a specific model number I missed.
EDIT: here's a picture of one just like it (not mom's!) https://scontent.fymy1-1.fna.fbcdn.net/v/t1.0-9/s720x720/91616099_500726793956274_963100700496101376_o.jpg?_nc_cat=100&_nc_sid=110474&_nc_ohc=1F8O2HFCHi8AX-PfFKl&_nc_ht=scontent.fymy1-1.fna&tp=7&oh=2f5f43f322dceec653f937caa504b081&oe=5F7DBF3D