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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Design position report detailing modifications and their status for Merlin 'B', 'C', and 'D' engines.

Identifier  ExFiles\Box 30\3\  Scan142
Date  18th March 1935 guessed
  
(9)

ITEM. DESIGN POSITION.

MERLIN "B" ENGINE.

Modified lower half crankcase. Completed.
Increased capacity oil scavenger pumps. In hand.

MERLIN "C" ENGINE.

Drive for Herzmark Air Compressor. Completed.
Mods. to position of starter motor. Put aside.
Divided crankcase and cylinder jackets. In hand.
Cylinder head mods. to suit divided crankcase and
cylinder jacket construction. In hand.
Roller bearing for increased centres layshaft supercharger
drive. Completed.
Modified lower half crankcase. In hand.

MERLIN "D" ENGINE.

Revised cylinder head and valve gear. In hand.
Oil baffle for starter gear wheel. Put aside.
  
  


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