<p>A neck cooler assembly (8) within a Stirling engine, which assembly consists of a neck cooler cylinder (8.3) and a neck cooler outer shell (8.4) both parts welded together to form a shroud with voids (V) in conjunction with inlet and outlet cooling ports that allow the passage of a coolant which can control the operating temperature of the power piston crosshead and power piston. The neck cooler assembly (8) includes a cylinder bore (D2) where the Stirling engine power piston is located and another bore (Dl) that retains and guides the Stirling engine Power Crosshead.</p>
