Hi Eddie, from the CNH parts web site: http://www.caseih.com/parts/parts.aspx?navid=123&RL=ENNA
Unfortunately B250 is not listed but B275, BD144 and B414 are, so see below for part numbers and serial number ranges.
Is it possible that the shaft is shorter on B250 because it did not have an hour/tachometer on the dash? Hour meter was by injection pump. I know on B275 & B414 Diesels the hour/tachometer ran from an assembly that attached to the top of the oil pump drive shaft.
BD144 Engine: 3043131R93 PUMP PUMP ASSY., oil, Engine serial no. 17289 and above.
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