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).
Standardisation of parts for a rocker shaft to resolve insufficient lubrication.
| Identifier | ExFiles\Box 88\4\ scan0046 | |
| Date | 19th February 1934 | |
| RR 755B (5H) (S2674, 16-10-33) BM. 3/262/6. X254 Completed 13.3.34. BENTLEY STANDARDISATION of PARTS. Date 19.2.34 Description of Parts. ROCKER SHAFT. X No. 254 Drawing No. E.B.131. Part List Origin. Complaint by Test Department of insufficient lubrication to rocker shaft. Report of Experimental Test. This trouble was overcome by drilling 12 holes in such positions that each corresponded with the annular groove formed by the ends of the bushes of each rocker. The holes are graded in a similar manner to the 20/25 rocker shaft except that the smallest holes are at the centre of the shaft (owing to single central oil feed), i.e.- The rockers to No. 1 & 6 cylinders have .062" dia. holes. " " " 2 & 5 " " .046" " " " " 3 & 4 " " .039" " There is no trouble with over-lubrication of the valves. As this scheme is similar to 25 HP., 10,000 mile test not considered necessary. Weight of Old Part. Cost of Old Part. £ Weight of New Part. Cost of New Part. £ Difference per Car. Difference per Car. £ NEGLIGIBLE Signature from Cost Dept. that above is correct. C/Rh{R. Hollingworth} 28/2/34 Cost of Parts in Works which will be scrapped if commenced on:- Series............£......... Series............£......... Series............£......... INITIAL | DATE | REMARKS SG.{Arthur F. Sidgreaves - MD} | 12-3-34 | Agreed S.G. WOR.{Arthur Wormald - General Works Manager} | 1.3.34 | Agreed Wor.{Arthur Wormald - General Works Manager} C. | 2.3.34 | Agreed C. RG.{Mr Rowledge} | | Rg.{Mr Rowledge} absent. DA.{Bernard Day - Chassis Design} | 1.3.34 | Agreed Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 2.3.34 | Agreed By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 1.3.34 | Agreed EP.{G. Eric Platford - Chief Quality Engineer} But essential better joint for rocker cover - even now leaks. E.{Mr Elliott - Chief Engineer} | 5.3.34 | Agreed AE. The above is suitable for immediate use, but means drilling a total of 36 small holes in shaft where 12 only should be required feeding annuli. A further shaft should be now developed with 12 holes only and these feeding the annuli, & this type to be used on all engines. BN.{W.O. Bentley / Mr Barrington} | 2.3.34 | Agreed Bn.{W.O. Bentley / Mr Barrington} SFT.{Mr Swift} | 1.3.34 | Agreed Sft.{Mr Swift} MX.{John H Maddocks - Chief Proving Officer} | 1.3.34 | Agreed Mx.{John H Maddocks - Chief Proving Officer} HS.{Lord Ernest Hives - Chair} | 29.2.34 | Agreed Hs.{Lord Ernest Hives - Chair} [Stamp: RECD 12 MAR 1934] | ||