What would cause a vertical section of 4" cast iron drain pipe to develop a single crack lengthwise for about two feet in the middle (not all the way to either end)?
The pipe is over 70 years old. The area (building interior) never got below freezing.
Does cast iron occasionally have stresses from manufacturing that cause it to suddenly and unpredictably crack?
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.
It happens,I replaced around 20' of 4" last week that was exposed to tie in some ground work for a new bathroom with a crack like that in a 3' section of it so we went ahead and replaced it all while we were there
Cast iron usually gets eaten up from the inside out,so it may be pretty thin in that area when you open it up
"facts" have no relevance to this discusion
Posting from a concrete bunker under a non descript barn