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).
Table of design modifications listing the design number, parts affected, and remarks for each change.
| Identifier | ExFiles\Box 91\1\ scan0550 | |
| Date | 23th May 1938 | |
| - 2 - Da{Bernard Day - Chassis Design}/Mc.S.2/G.23.5.38. DESIGN NUMBER. | PARTS AFFECTED. | REMARKS. ---|---|--- E.CD.623 | Water Pump and crankcase top half. | Modifications to Water Pump to suit E.CD.551. E.CD.628 | Suction Oil Filter, Crankcase lower half. | Alterations to facilitate removal of filter from sump to clear revised side steering tube. E.CD.635 | Camshaft and Bearings, Tappet mechanism including push rods. | Flat barrel type tappets. Further designs showing valve lift curves and cam forms will be issued. E-CD-821 | STRENGTHENED TAPPET | E.CD.644 | Engine Controls, Steering Box. | Modified Engine Controls to suit Wraith type steering box. E.CD.666 (2 sheets) | Engine Offside Undersheets. | Modified to clear Wraith type steering gear. The nearside undersheets are not altered. E.CD.680 | Engine Controls. | The ignition controls are altered to suit modified undersheet. E.CD.715 | By-pass Oil Filter, Crankcase top half, Induction pipes and oil pipes. | This is an alternative to the A.C. By-pass filter shown on E.CD.590, and shows the application of the "General" By-pass filter. E-CD-726 | | ||