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

The instructions suggest to rinse boiler out with water before first run, I noticed some specks of dirt on my boiler sight glass, so I removed it and dumped this out of the boiler.

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Shine a light inside and there is 2-3 times that much flux? Lumpy scale cling to the walls concentrated around solder joints....I know steam feeds from top of boiler, but would not like to have pushed Any of that grit thru my steam Cylinder!