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).
Summary table of common engine faults and their remedies for various car models.
| Identifier | ExFiles\Box 47\3\ Scan526 | |
| Date | 31th December 1932 guessed | |
| - 7 - 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. ENGINE OVER-OILING. December Quarter. C.C. 2 5 - 3 5) W.P. - - - 6 11) 16 Previous " C.C. - 2 1 5 8) W.P. - 1 10 15 26) 34 Six Months. -- 2 8 11 29 50 50 REMARKS: The majority of these are top over-oiling and definitely cured, by restricting the oil flow at the valve end of the rockers. See Depot Sheets Hd.{Mr Hayward/Mr Huddy}147., Hd.{Mr Hayward/Mr Huddy}174 and Hd.{Mr Hayward/Mr Huddy}176. ENGINE - SPRING DRIVE AND GEAR RATTLES. December Quarter. C.C. 4 13 1 1 19) W.P. 2 - - - 2) 21 Previous " C.C. 4 5 1 4 14) W.P. 2 2 1 1 6) 20 Six Months. -- 12 20 3 6 41 41 REMARKS: Early 20 HP. and Ph.I.- These can be cured by fitting cotton duck washers in place of bakelite. 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. ENGINE - VALVE SPRINGS BROKEN OR WEAK. December Quarter. C.C. - - - 4 4) W.P. - - - 5 5) 9 Previous " C.C. - - - 3 3) W.P. - - - 8 8) 11 Six Months. -- - - - 20 20 20 REMARKS: New type valve springs with semi-open ends and circular grinding are now being used and are a definite improvement. EXHAUST VALVES STRETCHING. December Quarter. C.C. - - - 3 3) W.P. - - - 4 4) 7 Three months. -- - - - 7 7 7 REMARKS: This trouble is now overcome on Ph.II, by heavier Exhaust Valves. Depot Sheet Hd.{Mr Hayward/Mr Huddy}238 deals with complaints on earlier cars. | ||