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).
Proposal sheet detailing changes and test results for Chassis 1101, specifically regarding covered valves.
| Identifier | ExFiles\Box 81\2\ scan0167 | |
| Date | 7th October 1924 | |
| Oy5-E-10724 R' + 4616 October 7, 1924. To: Mr. Belnap Mr. Claude Johnson Mr. Royce Derby Works Committee Mr. Burton Mr. Caswell Mr. Hadin From: Mr. Olley Re Proposal Sheet No.40 Chassis 1101 The changes referred to in this sheet with attached prints and report of experimental run, refer to the parts as discussed with Mr.Royce and the Derby Works Committee last April. Changes proposed at that time and some which have arisen since as a result of experience in assembly and test have been incorporated. Rubber shackles are not covered in these reports because it is not proposed to fit them at car 1101. These tests will be reported separately. 1. Covered Valves. (See prints marked 1.) No leakage of oil from valve covers has been experienced. A cork gasket is used on the face. The engine generally is very free from oil. End Tappets are accessible for adjustment with standard spanners. Inspection of valve guides, tappets etc. after test shows perfect condition. The whole scheme depends on holding the inner ends of the two cylinder blocks by a cramp on the centre main bearing bolt. The nut on this is accessible for a standard spanner. The further point is that, to hold the valve side of the cylinder blocks in proper contact with the crankcase, the 5/8 stud holding down each pair of tappet guides is screwed into the crankcase, while the shoulders on the tappet guides bear on facings on the cylinder block so that three extra holding down studs are provided on each cylinder block. No distortion of the bores from the metal between the cylinders or from the tension of the valve cover studs can be observed on inspection after test. Wear of valve stem and guide in 10,000 miles is nowhere as much as .001 total. | ||