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Just curious; how hot is too hot for the temperature of the metal smoke bowl on these smoke units (691-SSMU-F) with a new 691ACRGF04 regulator?  Rebuilt the smoke unit with new rope wick and 8 ohm element and opened intake.  Concerned this puppy gets hot; how hot?  Measured 218F with a digital meat thermometer held against the bowl  with "good" smoke for Lionel.  Now I know why the boiler around these smoke units gets rather warm; now way to vent the heat.  Just curious for input from the wizards on this forum; Falcon70

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I know they get hot enough that I'm not interested in putting my finger on them, but I haven't actually measured the case temperature.  As long as they're drawing the right amount of current and producing reasonable smoke, I figure they're working.

Now, if the smoke regulator shorts, which happens from time to time, they'll get a WHOLE LOT HOTTER!  I had the privilege of seeing that happen in person once, it was spectacular!  The locomotive came out of the tunnel and the owner said "I never saw it smoke like that".  After about five seconds I realized that a Legacy locomotive doesn't smoke like that and hit the power disconnect.  It runs fine now, I replaced the regulator, smoke PCB, resistor, wick, impeller, smoke motor, etc.  The smoke bowl survived, but the locomotive still smells like burnt fiberglass.

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