Thimble crack

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Green Mtn Boy

New Member
Hearth Supporter
Nov 19, 2008
25
Northern Vermont
Just finished brushing out my heat exchange tubes and I gazed over at my chimney thimble to see a crack along it's length near top dead center. How concerned should I be? The mason left the thimbles out about 8 inches. I thought this was a little long but it never occurred to me they might crack. Must have gotten a little hot at some point when I was loading more wood on and the flames were going over the top and out.
 
My chimney thimble protrudes about 4''. I checked the temp last night, with the stove running about 395F, the exposed part of the thimble was under 200F. Personaly I would replace it imediately.
 
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