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 detailing engine faults and remedies for various models, including spring drives, timing gear rattles, and valve springs.
| Identifier | ExFiles\Box 130\1\ scan0114 | |
| Date | 31th December 1933 guessed | |
| - 7 - ENGINE - SPRING AND SLIPPER DRIVE. 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. December Quarter. C.C. 2 13 - 2 17) W.P. 1 - - 3 4) 21 Previous Quarter. C.C. 1 11 - 4 16) W.P. - - - 2 2) 18 Six Months. 4 24 - 11 39 39 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. ENGINE - RATTLE FROM TIMING GEARS. December Quarter. C.C. - 41 - 8 49) W.P. - 6 - 2 8) 57 Previous Quarter. C.C. 2 71 - 10 83) W.P. - 3 - - 3) 86 Six Months. 2 121 - 20 143 143 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 - VALVE SPRINGS BROKEN OR WEAK. December Quarter. C.C. - 2 - 2 4) W.P. - - - 6 6) 10 Previous Quarter. C.C. - 4 - 3 7) W.P. - - - - 3) 7 Six Months. - 6 - 11 17 17 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. | ||