How do you set the timing advance on a 3406B The engine is in a 980G 2ZR Serial number.?

if this is a 3406B cat motor you advance the timing under the nose cone on front of the assery drive which is on the front end of the same shaft that drives/runs the pump take the cone off and you will see a jam nut in the center with a screw in the center of the jam in is adv- out is retard