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 'Seagull' valve rocker components and associated drawings.
| Identifier | WestWitteringFiles\J\January1923\ Scan81 | |
| Date | 19th January 1923 | |
| TO - BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} c. to CJ. HS.{Lord Ernest Hives - Chair} ORIGINAL E1/M18.1.23. X9090 X4060 "SEAGULL" - VALVE ROCKER DETAILS, ETC. We send herewith drawing No. LeC 1669 shewing the above. This drawing supercedes LeC 1658 & 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 clos-er to the shaft and this latter has to be milled away oppo-site 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 infor-mation 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 adjust-ment 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. RECEIVED JAN 19 1923 HS{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} | ||