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).
Technical drawing of a main bearing centre top half.
| Identifier | ExFiles\Box 116\1\ scan0088 | |
| Date | 18th December 1933 | |
| SHELL A14236P FOR 1ST, 2ND, & 3RD STDS. L.P.T.B. = A14240P FOR 4TH, 5TH, & 6TH STDS. L.P.T.B. DRAWING NOT TO BE SCALED. LIST N° OF SHELLS ADDED L.P.T.B. S.R.C. 19-5-37 I-4979. WHITEMETAL FROM A.F. I-4979. 9-12-37 ALL GOODS MUST BEAR OUR PART No., OUR DATE LETTER AND MAKER'S TRADE MARK. ALTERATIONS 1) OLD PART N° U 66944 & VARIOUS ALTERATIONS MADE Y. 2ND TO 6TH STDS ADDED 1-6-34 2) DOWEL HOLES ADDED ON JOINT FACE I-2994 16-7-34 3) DIA B LIMITS FROM +.08 TO +.090 +0 +.077 I 3053 4-9-34 4) BORE LIMITS FROM +.040 TO +.123 I-3218. 7-12-34 +.102 5) 2 HOLES 3/16 DIA ADDED. ALTERNATIVE LIMITS ON DIA B ADDED. I-4302 18-12-36 6) WHITEMETAL FROM A.F. I-4347 14-12-36 7) LIMIT ON 105 DIA FROM +.03 +.05 FOR ALL PART N°S EXCEPT A14236. I-4554. 18-12-36 DRILL 13/64 DIA x 5 DEEP 1" CHAMFER AT 45° EACH END 105 DIA +.03 +.05 (FOR PART N° A14236 ONLY) 17/64 DIA HOLE JIG DRILLED 1 HOLE 3/16" DIA +.0005 x 5 DEEP BEARINGS MUST BE SCRAPED & BEDDED TO CRANKCASE BORE IN POSITION TO B DIA +.123 +.102 WHEN BOTTOM HALF OF BEARING IS LEAD BRONZE. BORE IN POSITION TO B DIA +.02 -.00 WHEN TOP & BOTTOM HALVES OF BEARING ARE WHITEMETAL. JOINT FACE MUST BE PERFECTLY FLAT & TO SIZE 2 HOLES 3/16" DIA. JIG DRILLED. SINK CUTTER TO DEPTH OF 2.5 4 HALVES OFF MATERIAL:- HIDUMINIUM A.C.7. BORE MUST BE CONCENTRIC WITH OUTSIDE OF SHELL MAIN BEARING / CENTRE / TOP HALF THE ASSOCIATED EQUIPMENT Co. LTD. SOUTHALL, MIDDLESEX. DRAWN V.M.N. TRACED M.L. CHECKED M.L. PASSED JMM G DATE 18.12.33 NEWALL STANDARD LIMITS ARE USED ONLY WHERE LETTER SYMBOL GIVEN B FOR HOLES, P PUSH FIT, D DRIVING FIT, F FORCE FIT, X RUNNING FIT, Y MACHINED DIMENSIONS WITHOUT LIMITS TO BE WITHIN +.01-0 OR -0 .2 m/m OF GIVEN SIZE Part Number Table: STD | S DIA. | B DIA. | F DIA. | PART N° 1ST | 88 | 85 | 84.4 84.5 | U98599 A.14236 2ND | 88 | 84.5 | 83.9 84.0 | A.14236B 3RD | 88 | 84 | 83.4 83.5 | A.14236C 4TH | 86.5 | 83.5 | 82.9 83.0 | A14240 5TH | 86.5 | 83 | 82.4 82.5 | A14240B 6TH | 86.5 | 82.5 | 81.9 82.0 | A.14240C MATERIAL LIST No. 10 SHELL MODEL No. 0761 MADE FROM SHELL 4 5/8" O.D. x 3/4" I.D. x 2 1/2" LG. WHITEMETAL CAST IN. | ||