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 design modifications and their completion status for the Merlin F/1 engine.
| Identifier | ExFiles\Box 161a\4\ scan0156 | |
| Date | 29th October 1936 guessed | |
| ITEM. (11) DESIGN POSITION. MERLIN F/1 ENGINE -CONTINUED. Strengthened elbow and relief valve casing - scavenge pump (also G & H). Completed 24.9.36. Machining of wheelcase stud boss to clear generator drive idler gear (also G). Completed 28.9.36. Priming pipes and fittings - filter made accessible. Completed 28.9.36. Mod. to starter engaging mechanism (also G). Completed 1.10.36. Mod. to fuel pump driven gear. Completed 2.10.36. Mod. to priming pipes - new clip. Completed 1.10.36. Increased radii in corners of bore of accel.pump levers. Completed. Mod. to water outlet pipes to facilitate production. Completed 5.10.36. Thread modification on Hele Shaw blade adaptor. Completed 1.10.36. Pipe clips for Hamilton C.S. airscrew. Completed 6.10.36. Platesspring for retaining spark plug terminals - scissor type. Completed 9.10.36. " " " " bridge type. Put aside. Plugging of side oil drain holes in wheelcase. Completed 9.10.36. Mod. to water outlet pipes to facilitate production - two piece. Completed 12.10.36. Mod. to three stage relief valve. Completed 8.10.36. Intermediate conduit mod. to suit V.P. airscrew oil pipes. Completed 6.10.36. Locking of end plug in hand starter shaft. Completed 12.10.36. Preliminary installation of Hele Shaw unit. Completed. | ||