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).
Statistical report on various engine and exhaust faults across different models with remarks on solutions.
| Identifier | ExFiles\Box 130\1\ scan0128 | |
| Date | 31th March 1934 guessed | |
| - 7 - FRONT EXHAUST SILENCERS CRACKED. 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. March Quarter. C.C. - - - 17 W.P. - - - 6 TOTAL 17) 6) 23 Previous Quarter. C.C. - - - 7 W.P. - - - 5 TOTAL 7) 5) 12 Six Months. - - - 35 35 35 During previous quarters these have been included in Exhaust Blows Generally. ENGINE - SPRING AND SLIPPER DRIVE. March Quarter. C.C. 5 49 - 5 W.P. 2 10 - 2 TOTAL 59) 14) 73 Previous Quarter. C.C. 2 13 - 2 W.P. 1 - - 3 TOTAL 17) 4) 21 Six Months. 10 72 - 12 94 94 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 cure this trouble. See Depot Sheets Hd.{Mr Hayward/Mr Huddy}190 and Hd.{Mr Hayward/Mr Huddy}227. 20/25 HP. Synchromesh Cars. - Cam Balancing device now standardised on new cars, and design for existing cars is available to overcome gear rattles. ENGINE - RATTLE FROM TIMING GEARS. March Quarter. C.C. - 33 - 15 W.P. - - - 1 TOTAL 48) 1) 49 Previous Quarter. C.C. - 41 - 8 W.P. - 6 - 2 TOTAL 49) 8) 57 Six Months. - 80 - 26 106 106 ENGINE - VALVE SPRINGS BROKEN OR WEAK. March Quarter. C.C. - 4 - 2 W.P. - 1 - 3 TOTAL 6) 4) 10 Previous Quarter. C.C. - 2 - 2 W.P. - - - 6 TOTAL 4) 6) 10 Six Months. - 7 - 13 20 20 New type valve springs with semi-open ends and circular grinding are now being used and are a definite improvement. The 20/25 HP. failures are believed to be due to a batch of faulty material. | ||