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).
Quarterly report summarizing engine issues for 25 HP and PH.II models, including spring drive, timing gear rattle, and valve spring failures.
| Identifier | ExFiles\Box 130\1\ scan0139 | |
| Date | 1st June 1934 guessed | |
| - 6 - ENGINE - SPRING AND SLIPPER DRIVE. 25 HP. PH.II. TOTAL. GRAND TOTAL. REMARKS. June Quarter. C.C. 38 17 55) W.P. 13 1 14) 69 Previous Quarter. C.C. 49 5 54) W.P. 10 2 12) 66 Ph.II. - Latest type low inertia drive with "window" type pressure plate cures this trouble. See Depot Sheets Hd.{Mr Hayward/Mr Huddy}190 and Hd.{Mr Hayward/Mr Huddy}227. Six Months. 110 25 135 135 ENGINE - RATTLE FROM TIMING GEARS. June Quarter. C.C. 36 1 37) W.P. 4 - 4) 41 20/25 HP. Synchromesh Cars. - Cam balancing device now standardised on new cars and design for existing cars is available to overcome gear rattles. Previous Quarter. C.C. 33 15 48) W.P. - 1 1) 49 Six Months. 73 17 90 90 ENGINE - VALVE SPRINGS BROKEN OR WEAK. June Quarter. C.C. 4 3 7) W.P. 1 8 9) 16 New type valve springs with semi-open ends and circular grinding are now being used and are a definite improvement. The 20/25 HP. failures are believed to be due to a batch of faulty material. Previous Quarter. C.C. 4 2 6) W.P. 1 3 4) 10 Six Months. 10 16 26 26 | ||