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).
Discussion of design improvements for the 'SS' Valve Rocker Cover, addressing oil leaks, noise, and fastening issues.
| Identifier | ExFiles\Box 13\2\ 02-page038 | |
| Date | 2nd February 1929 | |
| R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} c.c. to BJ. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} 47090 E1/M2.2.29. 'SS{S. Smith}' VALVE ROCKER COVER. X.7050 X.7090 We have obtained from Derby a print of what is being tested for the above, and this Esker print (Sch.1101) is attached. Arising out of the 10,000 miles test there is a complaint that this cover leaks oil at the front and end arrives at a metal to metal contact, also that two fastenings are insufficient. So far as we understand the felt strip and spring holding were introduced by Derby on account of noise from the valve gear. If felt must be used we should like the outer lip to definitely lap over the cyl. head as in fig.1. on blue-print of LeC. 2851 attc. We think the lip in sch.1101 probably lodges on top of the cyl. head. We should also like to clamp the cover down by direct pressure, using say a flat spring washer only under the thumb nut to lock it. On the other hand we should like to get rid of the felt altogether and try some scheme such as fig.2. in which all flat surfaces are banished from the cover to eliminate drumming. A third scheme would be to combine figs.1. and 2. The side elevation shews now 4 holding down studs instead of 2 could be used. Owing to the rocker mechanism being arranged in two units there is no central stud to suit a three stud fixing. It would be possible to add a special stud in the centre outline, and use a grouping thus : [Diagram of a rectangle with three circles inside] E.{Mr Elliott - Chief Engineer} | ||