Mark Huber Wrote:
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> Still could be either- Arch tube plugs are
> huge. That just looks like a regular wash-
> out plug. I'm not certain as I've not worked
> on an engine with arch tubes - but that plug
> is just above the crown sheet (notice the tag
> just to the right of the water glass valve -
> that's likely the "High Point of the Crown
> Sheet" tag), which is where the upper row
> of washouts are typically. It's my under-
> standing that arch tubes would have their
> plugs lower than that. But I certainly do not
> understand everything, so I could be wrong.
And Earl Replied:
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> As noted above, washout plugs are above the
> crown sheet, arch tube plugs are below the
> crown as arch tubes are attached to the door
> sheet in the firebox, and the plug lines up
> with {the} tube so washout water can be sent
> down the tube.
O-K, guys -
I understand even less - actually quite a bit less - than Mark.
Is the photo more likely #493 than #491, or does it not include enough info to tell?
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Roosso (MUY) Loco