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).
Blueprint for an Inlet Valve Seat.
| Identifier | ExFiles\Box 140\3\ scan0228 | |
| Date | 10th December 1937 | |
| No OPERATION MACHINE TOOL TOOL.No. SEE OP. LIST 19545 E VALVE SEAT TO BE MACHINED WHEN IN POSITION IN CYL. HEAD. 8 SPLINES EQUALLY SPACED 35° 1.550 DIA: +10 -0 1.303 DIA +2 1.178 DIA +2 THREAD & SEATING MUST BE CONCENTRIC. TURN 1.650 +1/2 DIA SCREW 1.650 +0 -1 DIA: 20 T.P.I" R.H. FULL THREAD TO GAUGE. .225 +1 E.89238. SIMILAR TO E 88170 BUT HAVING A FULL FORM THREAD .025 +10 -0 CHAMFER AT 45° ±2° .050 +10 -0 60° +15° -7.5° 1.584 DIA -5 UNDERCUT 1.745 DIA -5 .075 -5 .525 -10 CYLINDER HEAD SHOULD BE HEATED TO 300F. BEFORE SCREWING VALVE SEAT IN POSITION. REPLACE ALL COPIES TO:-- EXP. | PATT WORKS | FORGE T.O. | S.R. D.O. | R.D T.D. | COST DRAWN TRACED Thel CHECKED APPROVED LIMITS O.K. DATE 10-12-37 USED ON: Ph III No. OFF: 12 SECTION: 5050 ALL DIMENSIONS ARE EXPRESSED IN INCHES, ALL LIMITS IN THOUSANDTHS OF AN INCH. SCALE 1/1 MACHINE ALL OVER OR WHERE MARKED THUS HEAT TREAT BRINELL TITLE: VALVE SEAT - INLET MATERIAL: FIRTHS N.M.C. SPEC'N No E.89238 (Faint mirrored stamp): DERBY 14 NOV 1938 | ||