Rocker arm assembly

A valvetrain assembly comprising:

• a first engine valve;
• a second engine valve;
• a valve bridge operatively associated with the first and second engine valves;
• and
• a combined exhaust and engine brake rocker arm assembly configured to selectively open first and second exhaust valves, the rocker arm assembly comprising:
• a rocker arm body;
• an exhaust rocker arm assembly formed in the rocker arm body;
• a lost motion spigot assembly operably coupled to the exhaust rocker arm and including an adjustment nut and guide configured to receive a shaft assembly for adjusting a lash of the lost motion spigot assembly, the shaft assembly disposed within a bore of the adjustment nut below an upper surface thereof;
• and
• an engine brake rocker arm assembly formed in the rocker arm body and configured to operate in a collapse mode and a rigid mode,
• wherein the lost motion spigot assembly is configured to selectively engage a valve bridge to open the first and second exhaust valves,
• wherein the engine brake rocker arm assembly is configured to selectively engage the valve bridge to open only the first exhaust valve.