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).
Quarterly report summarizing engine faults and remedies across various models.
| Identifier | ExFiles\Box 130\1\ scan0030 | |
| Date | 31th March 1933 guessed | |
| - 7 - 20 HP. 25 HP. PH.I. PH.II TOTAL. GRAND TOTAL. REMARKS. ENGINE OVER-OILING. 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 Hm.{Capt. W. Hallam - Head Repairs}147., Hd.{Mr Hayward/Mr Huddy}174 and Hd.{Mr Hayward/Mr Huddy}176. March quarter. C.C. - 4 3 4 11) 17 W.P. - 1 - 5 6) Previous quarter. C.C. 2 - - 3 5) 16 W.P. - 5 - 6 11) Six Months. 2 10 3 18 33 33 ENGINE - SPRING DRIVE AND GEAR RATTLES. 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. March quarter. C.C. 1 13 2 10 26) 32 W.P. - 2 1 3 6) Previous quarter. C.C. 4 13 1 1 19) 21 W.P. 2 - - - 2) Six Months. 7 28 4 14 53 53 ENGINE - VALVE SPRINGS BROKEN OR WEAK. New type valve springs with semi-open ends and circular grinding, are now being used and are a definite improvement. March quarter. C.C. - 1 1 6 8) 10 W.P. - - - 2 2) Previous quarter. C.C. - - - 4 4) 9 W.P. - - - 5 5) Six Months. - 1 1 17 19 19 EXHAUST VALVES STRETCHING. 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. March quarter. C.C. - - - 4 4) 4 W.P. - - - - -) Previous quarter. C.C. - - - 3 3) 7 W.P. - - - 4 4) Six Months. - - - 11 11 11 | ||