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).
Tappet settings, valve springs, and a flywheel and clutch modification scheme.
| Identifier | ExFiles\Box 91\2\ scan0350 | |
| Date | 18th September 1937 | |
| 3. The tappets were set at .012". The adjustment necessary was negligible, and no exhaust valve lost more than .002 clearance throughout the mileage. The standard of silence was equal to the hydraulic tappets, and did not deteriorate during the running. No breakages occured either with the standard Bentley valve springs or with those produced at the Tempered Spring Co. ----------------- Flywheel and clutch LOP.G.85761. W.P.4998/9/5000 - 5004 - 8 - 17 - 37. Chespence R.R. clutch incorporating :- 1 - Ex.23088 Long type compound cushioned plate with spring centre. 2 - Ex.23083 Thermoid facings. Ex.967 Clutch pedal servo spring. Ventilated clutch housing. ----------------- Objects of scheme. (a) To overcome fierceness and jaggers and obtain a more progressive engagement. (b) To obtain a lighter pedal pressure. (c) To simplify the layout and reduce cost by using amongst others, the following modifications:- Flywheel and starter ring in one piece. Four fingers in place of six. Deletion of tail bearing on clutch casing and oilite bush. continued | ||