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).
Customer complaints related to valves, flywheel knock, and hydraulic systems over quarterly and six-month periods.
| Identifier | ExFiles\Box 130\1\ scan0366 | |
| Date | 31th March 1936 guessed | |
| 6. 20 Valves sticking or noisy. March quarter C.C. 2 2 2 C.P. Previous quarter C.C. 2 2 C.P. I I 3 Six months 5 5 5 70.SK (20.000 kms) Noisy valve mechanism. during an R.10 engine clean we reamered out ends of exhaust guides to give extra clearance. 171.RY (19.918 miles) Ditto as above. 21 Slipper flywheel knock. March quarter C.C. C.P. Previous quarter C.C. I I I C.P. Six months I I I ----- 22 Total hydraulic complaints. March quarter C.C. I I I C.P. Previous quarter C.C. 2 I 3 3 C.P. Six months 3 I 4 4 Owing to the fact that we have modified a number of dampers on the earlier PH.II cars by fitting steel seatings to the replenishing ball valves and oil feeds to the intermediate levers, we now get less complaints of knocks. 23 Hydraulic knocks. March quarter C.C. C.P. Previous quarter C.C. I I I C.P. Six months I I I ----- | ||