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).
Modifications to the valve gear lubrication system for the Phantom III engine.
| Identifier | ExFiles\Box 96\2\ scan0201 | |
| Date | 11th January 1937 | |
| Hs.{Lord Ernest Hives - Chair} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to Sg.{Arthur F. Sidgreaves - MD} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} Rm{William Robotham - Chief Engineer}/Swd11/R.11.1.37. VALVE GEAR LUBRICATION (P.III). The following modifications to the lubrication of the valve tip and the push rods as developed by GWH{George W. Hancock - Head Chateauroux} appears very promising when fitted, and the ultimate result will be when appreciable mileage has been run. (1) Single hole .015 dia. to be drilled in the annulus of each bronze rocker bush. (2) 4 felt pellets made out of E.77877 felt fitted in the valve end of each rocker. (3) Retain .015 dia hole in the valve end of each rocker. (4) Groove in adjusting screw and bottom ball end of the push rods made to Ex25504 and Ex24663. Top over-oiling can be said to be almost cured by the scheme. This has been demonstrated on 3.AZ.170, 3.BH.80 and 35 EX, the 15,000 mile car. Only mileage can tell whether the felts will retain their ability to allow the creep of oil and not sludge or harden up. The oil holes in the bushes are to increase the supply to the ball ends. Grooving at the bottom of the push rod ball end has reduced the wear appreciably and the same is expected at the top by grooving the adjusting screw. In view of the fact that with the present standard lubrication there is wear of the adjusting screw and the push rod ball end, together with top over-oiling, the modified scheme could be included with immediate beneficial results. Rm{William Robotham - Chief Engineer}/L.H. Swindall. | ||