Pendulum vibration absorber

A crankshaft assembly for an internal combustion engine, comprising:

• a crankshaft having a lobe with a pendulum absorber coupled thereto, the pendulum absorber including:
• a carrier coupled to a body of the lobe and having an opening therein,
• a pendulum having an opening therein, and
• a primary pin received in the carrier and pendulum openings to couple the pendulum to the carrier;
• and
• a retention arrangement including:
• a retention flange extending from the carrier and including a retention surface;
• a pair of retention arms extending from the pendulum and spaced apart from each other along an axial direction of the crankshaft the retention flange being slidably positioned between the retention arms;
• and
• a retention pin coupled to the pair of retention arms;
• wherein the retention arrangement is configured to maintain the retention pin in spaced relation to the retention surface during movement of the pendulum when the primary pin maintains the pendulum coupled to the carrier, and to retain the pendulum relative to the carrier through engagement of the retention pin with the retention surface in an absence of the primary pin maintaining the pendulum coupled to the carrier.