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 and specifications for the 'Seagull' valve rocker details.
| Identifier | ExFiles\Box 72\1\ scan0219 | |
| Date | 18th January 1923 | |
| To BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} c. to CJ. Hs.{Lord Ernest Hives - Chair} X. 9090. E1/M18.1.23. "SEAGULL" VALVE ROCKER DETAILS ETC. X. 9090 We send herewith drawing No. LeC.1669 shewing the above. This drawing supercedes LeC.1658 and 1667 in respect to the details of the valve rocker shaft and brackets which have been slightly modified. These brackets are intended to be drop forged on their sides, and those with the long bosses should afterwards be lightened by machining as shewn on the drawings. The vertical securing studs have been brought closer to the shaft and this latter has to be milled away opposite to the studs. The stud is now exactly in the middle of the valve gear cover. The valve on this drawing has been shewn without any clearance with the rocker; this clearance will probably be from .004" to .006". We will send you drawing LeC.1671 giving you inform- ation with regard to the valve lift. The eccentric rocker bushes have an angular movement of 60° for the purpose of adjusting tappet clearance, and this, owing to the degree of eccentricity being .025" gives a vertical movement of .025" at the rocker centre, which results in an effective adjustment of .057 at the valve stem. We should be glad if you would return a blue print of this drawing at the earliest possible moment. E.{Mr Elliott - Chief Engineer} | ||