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 faults across different car models over a six-month period, with proposed solutions.
| Identifier | ExFiles\Box 47\3\ Scan257 | |
| Date | 30th September 1931 guessed | |
| -11- ENGINE - VALVES SPRINGS BROKEN. 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. September Quarter. C.C. - 1 1 6 8 } 31 W.P. - 1 4 18 23 } 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 " C.C. - 1 3 8 12 } 26 W.P. - - 1 13 14 } Six months. - 3 9 45 57 57 ENGINE - VALVES STICKING. September Quarter. C.C. 1 - 4 1 6 } 6 W.P. - - - - This can be cured by providing adequate clearance at the mouth of the valve guide to allow for the formation of carbon. Previous " C.C. - - 4 1 5 } 5 W.P. - - - - Six months. 1 - 8 2 11 11 ENGINE OIL PRESSURE FALLS. September Quarter. C.C. 2 2 - 1 5 } 5 W.P. - - - - On 20 HP. this is due to oil surging in the crankcase when braking, and is cured by fitting a baffle to the oil sump. Previous " C.C. 1 3 - 1 5 } 5 W.P. - - - - Six months. 3 5 - 2 10 10 WATER LEAKS FROM CYLINDER. September Quarter. C.C. - - 11 4 15 } 73 W.P. - - 25 33 58 } Ph.I. & PH.II definitely cured by fitting nickel plated copper tubes in place of the original aluminium tubes. All cars being attended to whenever possible. Previous " C.C. 2 - 7 2 11 } 11 W.P. - - - - Six months. 2 - 43 39 84 84 | ||