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).
List of modifications and their status for the Merlin 'C' engine.
| Identifier | ExFiles\Box 30\3\ Scan170 | |
| Date | 17th April 1935 guessed | |
| (sheet 7) ITEM. DESIGN POSITION. MERLIN "C" ENGINE. Modifications to oil pipes for V.P. airscrew reduction gear. Completed. " " centre main bearing block. Completed. Modified lower half crankcase (R.engine type). In hand. Water Inlet pipe - pump to cylinder. Completed. Piston:- 6:1 compression ratio - ribbed type. Completed. Valve spring collars. Completed. Cylinder studs. Completed. Modification to main oil connection - relief valve. Completed. Modification to strap type connecting rods. Completed. " to water pump inlet casing. Completed. Hub for wooden airscrew. Completed. Blanking cover for gun gear. Completed. Modified upper vertical drive. Completed. Top water outlet pipes - front outlet. Completed. Oil pipes:- to camshaft, reduction gear and V.P. propeller. Completed. | ||