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).
Hall's Metal Main Bearings, detailing measurements prior to and after a 17,000-mile road test.
| Identifier | ExFiles\Box 90\5\ scan0134 | |
| Date | 26th June 1936 | |
| Unit N° "B."20. HALL'S METAL MAIN BEARINGS. PRIOR TO & AFTER 17,000. MILES ROAD TEST. CRANKSHAFT: E.B.2687. V.C.M. MAIN BEARINGS E.B.2809-11-12-13-14 -HALL'S METAL-SOLID TYPE FITTED NEW: - 12-2-36 * - DIMENSIONS TAKEN AFTER 17,000 MILES ROAD TEST. + DENOTES AN INCREASE ON ORIGINAL SIZE. - DENOTES A DECREASE ON ORIGINAL SIZE. NOTE! OWING TO THE SLACKNESS OF THE BEARING HALVES IN THE CAPS & IN THE CRANKCASE, - NO ACCURATE "AFTER TEST" SIZES OF BORES ARE AVAILABLE. THE EXTENT OF THE GAPS BETWEEN THE JOINT FACES OF THE BEARING HALVES - & THE LINERS (SEE SKETCH) BEING AS FOLLOWS:- TABLE 1: BRG N°, WHEN MEASURED, JOURNAL DIA., MAIN BRG BORE, CLEARANCE 1. NEW, 2.2485, 2.2513, .0028 1. *, 2.2472, 2.2512, .0040 1. VARIATION, -.0013, -.0001, +.0012 2. NEW, 2.2482, 2.2513, .0031 2. *, 2.2472 2. VARIATION, -.0010 3. NEW, 2.2485, 2.2513, .0028 3. *, 2.2470 3. VARIATION, -.0015 4. NEW, 2.2485, 2.2513, .0028 4. *, 2.2473 4. VARIATION, -.0012 5. NEW, 2.2484, 2.2513, .0029 5. *, 2.2474 5. VARIATION, -.0010 6. NEW, 2.2483, 2.2513, .0030 6. *, 2.2473 6. VARIATION, -.0010 7. NEW, 2.2484, 2.2513, .0029 7. *, 2.2474 7. VARIATION, -.0010 TABLE 2: BRG N°, CRANKCASE HALF BRG, CAP HALF BRG 1.*, .0005, NIL 2.*, .00075, NIL 3.*, .00075, .0005 4.*, .0005, .0005 5.*, .00075, .0005 6.*, .00075, .0005 7.*, .002., .0015 DIAGRAM LABELS: CRANKCASE HALF BEARING GAP CAP CAP HALF BEARING | ||