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).
Parts compatibility list for various models including Bentley, 25/30, High Pressure Wraith P.III, and Modified HP Bentley V.
| Identifier | ExFiles\Box 149\3\ scan0068 | |
| Date | 16th May 1939 | |
| PART. | BENTLEY. No. | 25/30. No. | High Pressure Wraith P.III. No. | Modified H.P. Bentley V.{VIENNA} No. | REMARKS. Coil housing complete with coil. | 1419 & 1819 | 2 | 1419 & 1819 | 2 | 1788 | 2 | | 2 | Common to 25/30 & Bentley. P.III & Wraith Cast Iron for B.V. Pump body | 1800 | 1 | 1799 | 1 | 1796 | 1 | | 1 | S.U. Standard for B.V. Diaphragm assembly Impact washer. Valve disc. | 1418 1424 & 1425. 1447 839 | 2 2 4 | 1418 1424 & 1425. 1447 839 | 2 2 4 | 1783 1789 & 1790 1669 839 | 2 2 4 | 839 | 2 2 4 | (Common to Bentley & 25/30. (Separate for P.III and Wraith Neop. for B.V. Common to all pumps. Valve cages. | 1416 | 2 | 1822 | 2 | 1822 | 2 | 1822 | 2 | 25/30 P.III Wraith and B.V. common B.II separate. Retaining circlip Rollers. Alum washer under cage. | 840 1433 1805 | 2 22 2 | 1784 1433 | 2 22 X | 1784 1433 | 2 22 X | 1784 1433 | 2 22 X | Common to P.III Wraith B.V. B.II separate. Only on B.II. Retaining nut for valve cage. | 1804 | 2 | 1804 | 2 | 1804 | 2 | 1804 | 2 | Common to all types. Plugs top and Bottom | 1490 | 3 | 1490 | 4 | 1490 | 2 | | 4 | Common except on B.V. Air bottles. | | X | | X | 1781 & 1782 | 2 | | X | Only on P.III and Wraith. C. & A.{Mr Adams} Washers. | 1666 | 4 | 1666 | 4 | 1666 | 4 | | 2 | Common to all pumps. Small plug. | | 1 | | 1 | | 1 | | X | Common to all except B.V. C. & A washers for small plug. | 1665 | 1 | 1665 | 1 | 1665 | 1 | | X | Common to all except B.V. Filter Gauze Fibre washers Bottom plugs. | | X X | | X X | | X X | | 2 | Only on mod. H.P. pump for B.V. Inlet union Olive adaptor Delivery union Olive adaptor. Delivery union | 1671 1670 | X 1 X X 1 | 1492 1492 | X 1 X X 1 | 1492 1492 | X 1 X X 1 | | 2 X 1 1 X X | Only on mod. H.P. pump for B.V. Common except B.V. & B.II. Only fitted to B.V. Common except B.V. & B.II. Only fitted to B.V. Only fitted to B.II. | ||