Blueprint for a valve guide with dimensions and manufacturing notes.
| Identifier | ExFiles\Box 174\2\ img309 | |
| Date | 10th January 1939 guessed | |
| MAY BE LEFT UNFINISHED OPTIONAL DESIGN 3/8 D x 90° C'SINK ACROSS FLATS 17/32 DIMENSIONS (Imperial): Lengths: 5/8, 3/8, 2 5/16, 3 9/16, 1/4 Diameters: .615 D / .575, .627 D / .626, .336 D / .334 REAM IN: (U) .345 / .344 SECTION A-A --NOTES-- 1. (W) MAKE FROM H565-B CASTING 2. 3. CLEARANCE BETWEEN VALVE STEM & GUIDE .0015 - .0025 4. HOLE MUST BE STRAIGHT WITHIN .001 5. ROCKWELL HARDNESS 90-95 "B" SCALE 6. (W) TO CHECK CONCENTRICITY-VALVE GUIDE IS TO BE MOUNTED ON AN ARBOR EXTENDING 3/4 INCH INTO ONE END. (V) THE O.D. OF 4 OTHER END MUST RUN CONCENTRIC WITHIN .008 TOTAL IND. READING. | ||
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).