Burnham V-14A-T fire box replacement

It's not as hard as it looks. Clear everything out and clean the area thoroughly. You insert the target wall through the slot and turn it to line up with the back of the firebox. And yes, don't hurry.

Once you get the bolts out, clean everything, install the chamber and all the other parts, put NeverSeez™ on the bolts before you put them back in.

Another thing I find make for easy removal of the oil burner without disconnecting the fuel lines when there is little give on the copper tubing. Remove the fuel pump bolts from the burner and leave the pump disconnected from the burner. That way the fuel pump can just hang there in space while all the rest of the burner can be placed aside to access the chamber cover.

I figured that out many years ago when I needed to do 4 jobs in a row that required removing the oil burner from the front of the boiler or furnace and what a mess it made taking the oil lines off and trying to keep the fuel from spilling. The 2 bolts that hold the pump on take less time to remove than the fuel lines do.