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).
Tests and modifications for thermometers, tappet plates, and valve assemblies.
| Identifier | ExFiles\Box 108\3\ scan0229 | |
| Date | 9th May 1938 | |
| -4- Cylinders L.M.Ch.1375. SCD.177. Position for thermometer. The thermometer capillary fouled the H.T. distributor although previously satisfactory with the Delco. The position is to be moved for production. The thermometer capillary fractured where soldered into the bulb. A supporting sleeve as used on the Negretti thermometers has been called for. SCD.293. Tappet retaining plates. ------- were called for on last French test and proved satisfactory. Valves and Fittings L.O.Ch.1427. Sc.1429 Inlet valves S.S5. Sc.D1299 Exhaust valves R.F.965 (Stellited). No trouble was experienced with the valves. Various valve springs were tested. An E.N.3430 in swedish wire made at the -------- fractured after a short mileage, but five others ran 17,000 miles without any trouble. Six similar springs in swedish wire made at the Tempered Spring Co. as instructed for production, covered 10,000 miles and were satisfactory. A similar R.R. spring in S/GV. covered 18,000 miles. Modified cotter tappets to prevent push rods jumping out and jamming only 5/16" diameter push rods were fitted during the mileage and gave no trouble. The tappets were reasonably quiet but not exceptionally so. | ||