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).
Engine component failures across various models for the September quarter and a six-month period.
| Identifier | ExFiles\Box 47\2\ Scan352 | |
| Date | 1st September 1930 guessed | |
| -8- 20 HP. 25 HP. Ph.I. Ph.II TOTAL REMARKS. ENGINE - FAN PULLEYS. September quarter. - - 17 2 19. Previous - - 5 4 9. Modification in ex- istance - bolts fit- Six months. - - 22 6 28. ted in place of rivets. ENGINE - OIL PUMP NOISY. September quarter. 2 - 4 2 8 Previous - - 3 - 3 Six months. 2 - 7 2 11 ENGINE - VALVE SPRINGS BROKEN. September quarter. 1 1 - 6 8 Previous - - 1 6 7 New type valve spring now available - Depot Six months. 1 1 1 12 15 Sheet now being com- piled. ENGINE - VALVES STICKING. September quarter. - - 6 1 7 Previous - - 5 3 8 Six months. - - 11 4 15 | ||