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).
List of components and their corresponding part numbers or specifications for '4A & AC. II.' units.
| Identifier | ExFiles\Box 72\2\ scan0226 | |
| Date | 29th November 1926 | |
| RHC{R. H. Coverley - Production Engineer}12/BE.29.11.26. 4A & AC. II. -Units. Crankcase & Bearings Oil Gallery Cover in C'case (similar to Goshawk Scheme 680). otherwise to L.O.P. E.71255. Crankshaft Method of removing Ball Bearing Housing from Crankshaft to C.L.157. otherwise to L.O.P. E.70322. Spring Drive Dowelled Slipper Flywheel to LeC 2131. otherwise to L.O.P. E.71202. Connecting Rods Standard Conn: Rods with loose M/S. Big End Bushes to L.O.P. E.74490. Pistons 4-1 Compression (Pedestal type Pistons E.75185. to LeC 2237. No. 1-2-4- Pistons fitted with Phos/Bronze Stops. " 3-5-6- " " " " Duralumin " "L" Shaped Rings E.73287-E.73291. Cylinders Latest Cylinders with stiffer trunks E.70229-30. Valves & Fittings Duralumin Rocker Pedestals E.74550-1-2. New set of Standard tappets to L.O.P. E.72113. Undrilled type Rockers E.70211-12. Induction Pipe Hot Spot changed over from water-heated to Exhaust heated using Exhaust Bend E.75181. to L.O.P. E.72039. Carburetters <s>Duralumin Butterfly Throttle E.74090.</s> All Carb: Unions fitted with Alum: Washers in place of Fibre Washers, otherwise to L.O.P. E.72226. -con td- | ||