J-2 Engine (Building 4205)

Some time between October 2008 and July 2009, a J-2 engine was moved to Bldg 4205 and parked next to F-1 F-4023 (approximately as indicated in this Google Maps link). I understand that this J-2 was previously stored in Building 7241 on Redstone Arsenal; in fact, I originally thought that this was one of the engines that I saw there in February 2009.

The engine lacks near all of its hardware and is really little more than a thrust chamber.

The ID plate on the engine implies that this is J-2 serial number J-2113, but the bill of lading on the dolly identifies it as J-2146. This is doubly curious, as Alan Lawrie informs me that J-2113 was launched on Apollo 15's S-II (second) stage. Alan speculates that, much like the F-1 engine nozzle extensions, J-2 thrust chambers were mixed around and did not end up with the engine of the same serialization.