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 and their proposed solutions for various car models.
| Identifier | ExFiles\Box 47\3\ Scan338 | |
| Date | 1st December 1931 guessed | |
| -10- 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. ENGINE - OIL PUMP NOISY. December Quarter. C.C. 1 1 1 1 4 } 4 W.P. - - - - - } Previous " C.C. - 2 2 2 6 } 9 W.P. - - 1 2 3 } Six months. 1 3 4 5 13 13 Depot Sheet Hd.{Mr Hayward/Mr Huddy}206 deals with the fitting of an oil reservoir to the oil pump on Ph.II cars and is a definite improvement. ENGINE - VALVE SPRINGS BROKEN. December Quarter. C.C. 2 1 1 5 9 } 21 W.P. - 3 3 6 12 } Previous " C.C. - 1 1 6 8 } 31 W.P. - 1 4 18 23 } Six months. 2 6 9 35 52 52 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. ENGINE - VALVES STICKING. December Quarter. C.C. - - - 1 1 } 2 W.P. - - - 1 1 } Previous " C.C. 1 - 4 1 6 } 6 W.P. - - - - - } Six months. 1 - 4 3 8 8 This can be cured by providing adequate clearance at the mouth of the valve guide to allow for the formation of carbon. ENGINE - OIL PRESSURE FAILS. December Quarter. C.C. - - - - - } 2 W.P. - 2 - - 2 } Previous " C.C. 2 2 - 1 5 } 5 W.P. - - - - - } Six months. 2 4 - 1 7 7 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. | ||