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 and their remedies for 20 HP and 25 HP models.
| Identifier | ExFiles\Box 47\3\ Scan070 | |
| Date | 31th March 1931 guessed | |
| -10- ENGINE - FAN PULLEYS. 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. March quarter. C.C. - - 5 5 10 ) W.P. - - 39 18 57 ) 67 Trouble definitely overcome by fitting bolts instead of rivets. This is being done on all new cars, and on existing cars when necessary. Depot Sheet to be issued. Previous " - - 27 9 36 36 Six months. - - 71 32 103 103 ENGINE - OIL PUMP NOISY. March quarter. C.C. - - 2 1 3 ) W.P. - - 1 - 1 ) 4 Depot Sheet No.206 deals with the fitting of an oil reservoir to the oil pump on Ph.II cars and is a definite cure. Previous " 1 - 5 2 8 8 Six months. 1 - 8 3 12 12 ENGINE - VALVE SPRINGS BROKEN. March quarter. C.C. - - 1 11 12 ) W.P. - - 1 18 19 ) 31 New type valve springs with semi open ends and circular grinding now being used and are a definite improvement, but we have had one or two recurrent failures. Previous " 1 1 4 27 33 33 Six months. 1 1 6 56 64 64 ENGINE - VALVES STICKING. March quarter. C.C. - - 5 3 8 ) W.P. - - - - - ) 8 This can be cured by providing adequate clearance at the mouth of the valve guide to allow for the formation of carbon. Previous " - - 5 2 7 7 Six months. - - 10 5 15 15 | ||