TM 10-3930-669-34 3-3.  ENGINE/TRANSMISSION ASSEMBLY REPLACEMENT (CONT).  |’ (8) Using retainer, continue turning pulley (7) slowly until  dial  gauge  pointer  again  stops  moving  in one direction and starts to move in the opposite direction. (9) Place second mark (16) on pulley (7) at point indicated by the pointer. NOTE The point halfway between the two pulley marks is top dead center (TDC).  If the two pulley marks are the same position, that position becomes top dead center (TDC). (10) Determine the point halfway between two marks (15 and 16).  Mark this point as top dead center (TDC). 3-14