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).
The fitting and testing procedures for an air valve spring and air piston.
| Identifier | ExFiles\Box 66a\1\ scan0037 | |
| Date | 28th January 1935 | |
| R.R. 493a (50H) (D.B. 175 25-9-24) J.H.D. -7- EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/ACL/LG28.1.35. be removed complete with connecting rod - without disturbing the adjustment - and the upper side of the diaphragm sweated to the connecting rod. The lock nut should be tight and a split pin fitted. See attached print. Air valve spring. E.73034. It should be tested for load and deflection as given on this drawing. It is attached to the suction chamber cover by expanding one coil in the recess in the cover. When the cover is placed on the suction chamber the spring should just rest lightly on the air piston but the cover must be seated. This can be checked by tapping the cover lightly with the finger. This is important. To test the correctness of the spring setting, raise the air piston very slightly in the cylinder when the suction chamber cover should start to lift. Another check to see that the air piston works correctly is to raise it to its full extent with the cover nut and spring in position and take the time for it to return to rest. This should occupy on an average about 4 seconds. Hs{Lord Ernest Hives - Chair}/ACL. MADE AT CROXLEY | ||