Hi everyone, I have been reading old posts on here concerning cast iron stoves making noises when heating up.People described it as a pinging sound.I'm aware of the expanding metal sounds stoves make but this is different.It sounds like a log suddenly shifted.It is a thud sound & louder when the stove is really hot.I don't mind saying it scares the heck out of me.It did not do this last year.or this season until last couple days. It did do it one other year when the stove was newer.The styrofoam looking baffle got damaged & we replaced it with a metal one. Also a bolt wasn't tight & caused a tube to drop down.Thought all this might have caused the clunking noise in the past.The stove looked OK when it was cleaned good before this heating season.We replaced the asbestes blanket that is in the top.I asked the dealer 1 time & he had never heard of anything like I described but said not to worry. Anybody have a clue what the clunking sound could be? It just started a couple nights ago when we put in the heavy duty wood on account of this cold snap. PS If a stove could purr it would be purring like my cat now.It is dang cold out & stove is ready for an all night burn. All clunked out & settled down for the night. Rose.