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The teardrop-shaped item is the engine's liquid propellant gas generator. Essentially an inefficient rocket engine itself, the LPGG generates high-velocity gases which are used to spin the turbine, powering the turbopumps.

Picture 1 of 2.

The LPGG is tucked between the heat exchanger and the thrust chamber. This photo was taken from the top of the engine as it is displayed, looking slightly downward.

The flange at upper left is where the LPGG's exhaust enters the turbine manifold.