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).
Test report on the wear of bottom tappets for a Phantom III Unit No.8 after a one-hour endurance test.
| Identifier | ExFiles\Box 96\2\ scan0219 | |
| Date | 19th April 1937 | |
| Files. To Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 356 19.4.37 Phantom III. Unit No.8. Tests have been carried out to determine the wear of the bottom tappets on the above unit. This unit has a special camshaft LeC.5320, having a small base circle, and an angle between the cams of 140°. Nos. 1,2 & 3 tappet blocks cloudburst hardened. Nos. 4,5 & 6 " " fescolised Condition of tappets after 1 hour endurance:- A.Side. Tappets set at. | No. | Condition. ----------------|-----|-------------------------- Auto. | 1 | Fairly bad groove " | 2 | Lightly scratched. .008 | 3 | Bad groove .050 wide. .006 | 4 | Slight groove. .006 | 5 | " " .008 | 6 | Bad groove .050 wide. Auto. | 7 | Slight Mark. Auto. | 8 | Good condition. .008 | 9 | " " .008 | 10 | " " Auto. | 11 | " " Auto. | 12 | " " B.side. Tappets set at. | No. | Condition. ----------------|-----|-------------------------- Auto. | 1 | Slight groove. " | 2 | Bad groove .050 wide. .008 | 3 | " " " " .006 | 4 | " " " " Auto. | 5 | Fairly bad groove. Auto. | 6 | Bad Groove .025 wide. .008 | 7 | Good. Hardly marked. .006 | 8 | " " " .006 | 9 | " " " .008 | 10 | " " " Auto. | 11 | " " " Auto. | 12 | " " " D.C.R. Lee. | ||