Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Sorry you are still having 'odor' problems.

Does it still take an abnormally long time to reach operating pressure?
Does the stink come from the steam exhaust or the flue?
If it is from the exhaust, try to condense/capture it for testing purposes,
the more the better.

Could it be some leftover soldering flux?

Have you tried cleaning the boiler out with an environmentally safe fluid,
namely a few ounces of grain alcohol.  It dissolves an awful lot of organic
stuff.  Pour it into the boiler and shake it as best you can to agitate it a
bit - maybe let it sit a while, pour it out, and see what you get.  Just do not
blow yourself up - it is not a tennis ball cannon.

Good Luck,
Wayne

Ran it a few times, less smell.   Just doesn’t perform. It must’ve been some kind of metal or chemical in it.