While looking through the Konrad Dannenberg Collection at the archives of the University of Alabama at Huntsville I happened upon this cut-away drawing (apparently drawing no. 4523 B) of the V-2 rocket engine:

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Scan and restoration by heroicrelics.

This diagram appears to date back to 22 July 1942, and is in German. Google's translator tells me that "Ansicht in Richtung" "View in the direction" (so "Ansicht in Richtung Y" would be "View in the Y direction"). Also, Google believes that "Lage der Bohrungen für Zusammenbau beachten" (in the small inset drawing near the lower right) means "Note location of boreholes for assembly."

The diagram had the following text. Tracy Dungan tells me that this text was not part of the original drawing, but was added by the Germans in the United States after the war.

Text accompanying drawing.
Scan by heroicrelics.

Secret Command Matter

Remarks:

Since the development of the combustion chamber with mixing nozzle atomization did not produce the expected results and needed more development time, the combustion chamber with 18 burner cups was prepared for the series.

The form is compliant with the combustion chamber No. 35 with the following changes: inner skin of the middle section of 6 mm steel plate (1604.2 chrome-manganese-vanadium steel 60-70 kg/mm2).

The outer skin of the sphere part has 5 mm and continue to fm 4 mm deep drawing steelplates.

Non-cooled short part with protective coat against heat radiation. 6 inlets, 4 cooling chambers and better arrangement of the supplylines to them. At high-risk places additional cooling nozzles are screwed in. The burnercap elements are forged out of one piece with screwed-in feed nozzles. Also the thrustframe-connection is changed

Because of the difficult welding of light alloy the material of the combustion chamber head was changed to steel.

Translation courtesy Tracy Dungan, of www.v2rocket.com.

It appears to be dated 22 July 1942 ("Tag: 22.7.42"), but it also appears to be dated 9 August 1944 ("Aufgest. 9.9.44"). I know that "Tag" is simply "day" or "date", but I was unable to determine what the "Aufgest." abbreviation means.