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 modifications and specifications for various components of the YL.65 unit.
| Identifier | ExFiles\Box 71\3\ scan0036 | |
| Date | 9th December 1925 | |
| YL.65 - UNIT RHC{R. H. Coverley - Production Engineer}2/WS. 9.12.25. X.8000 -Crankcase & Bearings 1. Modified Main Bearing oil pipes(using brazed steel nipples) to Scheme 656. 2. Oil Gallery Cover in Crankcase(similar to Goshawk Sch: 680) otherwise to L.O.P. E.71255. X.8010 -Crankshaft Method of removing Ball Bearing Housing in Crankshaft to G.L.157. otherwise to L.O.P. E.70322. X.8020-Spring Drive Dowelled Slipper Flywheel to LeC 2131 otherwise to L.O.P. E.71202. X.8030 -Connecting Rod N/S Connecting Rods E.73762/3 with M/S Bushes E.73767 in Big End to LeC 2081 (Scheme 2.A) X.8040 -Piston Set of Standard Pistons E.73376 with "Brico" "L" shaped Rings X.8050 -Cylinder Vellumoid Water Pipe Joints on Cyl:face in place of Dermatine otherwise to L.O.P. E.70903. X.8060 -Valve & Fittings 1. Improved Lubrication of Tappets to Scheme 634. 2. Improved Bottom Valve Spring Washers EX.941 with more effective Spigot for Spring. 3. Oil Holes on Valve End of Inlet Rockers plugged. 4. Asbestos & Graphite Valve Spring Washers in place of Felt otherwise to L.O.P. E.72113. X.8070 -Induction Pipe Smaller dia: Alum Ind:Pipe & Bend EX.451-2(Water Heated) to LeC 2058 otherwise to L.O.P. E.72039. Should be replaced by standard -contd- | ||