WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Inspecting Crosshead For Cracks
Courtesy of CHRYSLER GROUP, LLC
Inspect the crossheads (1) for cracks and/or excessive wear on rocker lever and valve tip mating surfaces. Replace any crossheads that exhibit abnormal wear or cracks.