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).
Standardization and manufacturing specifications for push rods for the Wraith III & Bentley V models.
| Identifier | ExFiles\Box 100\3\ scan0017 | |
| Date | 12th January 1939 | |
| HSH also 654 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. By/CS. c. RHC{R. H. Coverley - Production Engineer}/WLD. c. RHC{R. H. Coverley - Production Engineer}/ c. G/Rb.{R. Bowen} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}7/MH.{M. Huckerby}12.1.39. PUSH RODS FOR WRAITH III & BENTLEY V.{VIENNA} Regarding the standardisation of the .4 carbon push rod for which we quoted the number EB.4312, we should like to make the position clear as to the finish etc. so that the drawings and operation planning can be made accordingly in line with the satisfactory 15,000 miles test on 8.B.V. (1) .4 Carbon steel jumped up from .312 bar as carried out by the Belgrave Engineering Co. (2) External of rod is sand blasted only. (3) Internal spherical at the top of the rod is machined, but not lapped. (4) External spherical at the base of the rod is turned, but not necessary to have a ground finish. (5) Rod heat treated at the ends or all over which ever is most convenient to production, to give a Brinell of 300 - 320. We should like to introduce the deeper spheres at the top of the push rods as soon as possible, which prevents the rod dropping out of the adjusting screw in the event of valve sticking or spring failure. The latter trouble was experienced on 8.B.V., the edge of the push rod sphere getting under the ball of the adjusting screw, thus trying to force the valve further open, forcing off the spring ring and smashing the valve guide. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||