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A search of Crankshaft in ARMY TM 9-2815-252-24P (P44/89) will lead you to part number 272-00039 - BOLT,MACHINE 5 - M8 X 1.25 X 20. That TM did not contain B18231B10035
The TM is for DIESEL ENGINE, MODEL DN2M-1, TWO-CYLINDER, FOUR CYCLE, FUEL INJECTED 2815-01-350-2205
Bolt shows as used...