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).
Installation drawing for a 10 inch A3 type clutch assembly.
| Identifier | ExFiles\Box 129\2\ scan0056 | |
| Date | 14th June 1935 | |
| TOP LEFT SECTION: 2.250" ±.005" PREFERABLE DIM. 1.125" ±.0025" .562" ±.001" 1.375" ±.0025" 2.750" ±.005" TO SUIT EXISTING THROWOUT FORK 3.375" PREFERABLE DIM 1.687" VIEW IN DIRECTION OF ARROW 'A' CASE HARDENED STEEL TRUNNION BLOCKS. MUST BE FREE ON PINS. EXISTING THROWOUT FORK PREFERRED THROWOUT FORK 1.5007 / 1.4993 BORE OF CARRIER 3.800" ±.005" MAIN DRAWING & NOTES: 6 HOLES .3760" DIA: EQUALLY SPACED C'BORE TAPPED HOLES. PLAIN PORTION OF SET-SCREW TO ENTER C'BORE 1/8 AS SHOWN. RECOMMENDED BRG No S.K.F. 6205. (NOT SUPPLIED BY BORG & BECK) NOTE:- 10" SPRING DRIVE PLATE SHOWN ABOVE & 8" & 10" RIGID DRIVE PLATE SHOWN BELOW. THE 11" SPRING DRIVE PLATE IS IDENTICAL WITH THE 10" EXCEPT FOR LENGTH OF HUB. SEE BORG & BECK DRwg SK 30600/2. NOTE:- A RETURN SPRING MUST BE PROVIDED ON PEDAL ARRANGEMENT TO MAINTAIN THIS CLEARANCE. HOLE DRILLED & TAPPED TO SUIT CUSTOMERS REQ'MTS NEW COVER WITH EXTENSION REQUIRED. CENTRE OF TRUNNION SHOULD BE PREFERABLY 5/32 ABOVE ¢ OF CLUTCH SHAFT TO RELEASE CLUTCH APPLY PRESSURE IN THIS DIRECTION. PRESSURE REQ'D = 240 LB AT TRUNNION CENTRE. RELEASE POSITION INITIAL ENGAGED POSITION 'WEAR IN' POSITION 10 5/8" O'DIA OF CLUTCH 11.627" / 11.623" P.C. DIA. 5 5/8" MAX. O/A.{Mr Adams} HUB CADMIUM PLATED THIS ALTERATION IS NECESSARY FOR THE 11" A3. 1/4 SPRING DRIVE PLATE IS USED. 4 DRAIN HOLES 1/8 DIA. EQUALLY SPACED. 1/8" MAX. MAINTAIN THIS DIMENSION FULL SPLINE TO THIS DIMENSION HOFFMAN BRG N° XLS. 1 3/4 1 1/2" DIA. S.A.E. 10 SPLINE SHAFT DIMENSIONS. RELEASE BRG CARRIER IN MAX 'WEAR IN' POSITION. ¢ OF TRUNNION SHOULD BE AS NEARLY VERTICAL WITH CROSS SHAFT CENTRE AS POSSIBLE. THROWOUT FORK & CROSS SHAFT MUST CLEAR CLUTCH DURING ROTATION. THIS CLUTCH IS SUITABLE FOR A MAXIMUM SPEED OF 5000 R.P.M. SALES DEPARTMENT. BOTTOM LEFT NOTES: NOTE:- Flywheel friction face should be 1.00/43 Carbon Steel, or alternatively of good quality close grained cast iron. The friction face should be flat, smooth and polished and should not "run out" more than .010", and the face of flywheel to which the housing flange is attached should not "run out" more than .003". It is important to see that the crankshaft and clutch shaft are co-axial in unit construction. The application of this model clutch is based on the following data: Name of Firm: Fodens Ltd Car Model: F.C. No of Cyl: 6 Maximum Torque: 112 R.P.M. Maximum Engine Speed: Open or Unit Construction: Vehicle Type: Lorry Vehicle Capacity: Date: 7-2-35 This Clutch is of the non-adjustable type. Therefore, some adjustment must be provided on the Pedal mechanism to compensate for friction facing wear. N.B. - Care must be taken to see that the driven plate is assembled in correct position, as illustrated i.e. with chamfered swine of hub towards the flywheel. Oil, Grease or Paraffin must not be allowed under any circumstances to be brought in contact with the friction face. BOTTOM RIGHT TITLE BLOCK & TABLES: MADE UNDER ONE OR MORE OF THE FOLLOWING BRITISH PATENTS 187411, 376473 197733, 377118 292842, 388337 301342, 377610 315748, 376218 337191, 379504 343385, 385108 370934, 388598 All Dimensions ± .015 Unless Otherwise Stated. All Corners Free From Fraise. Work to Dimensions. Do Not Scale. F = Good Finish O = Rough,, G = Ground,, ⊕ = Machine All Over This Print supersedes any issued previous to latest alteration date. It is Our Property and must be returned upon request. This Part must not be sold to any other concern. BORG AND BECK CO. LTD. LEAMINGTON SPA. ENGLAND. DESCRIPTION: INSTALLATION 10"A3. CLUTCH PART No. S.K.30604/6 NO. OFF PER SET MATERIAL SPECIFICATION DRAWN: FMS 7.3.35 TRACED: CHECKED: PJ PASSED: DATE ISSUED: 14 JUN 1935 | ||