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 an 11-inch A8 clutch.
| Identifier | ExFiles\Box 129\2\ scan0091 | |
| Date | 2nd October 1935 | |
| MAIN DRAWING ANNOTATIONS: 2.250" ±.005" PREFERABLE DIM: 1.125" ±.0025" 1.375" ±.0025" 2.750" ±.005" TO SUIT EXISTING THROWOUT FORK. 3.375" PREFERABLE DIM: 1.687" VIEW IN DIRECTION OF ARROW 'A' 1.5007"/1.4998" BORE 1.4993"/1.4988" OR CARRIER CASE HARDENED STEEL TRUNNION BLOCKS MUST BE FREE ON PINS. EXISTING THROWOUT FORK. PREFERRED THROWOUT FORK. 3.800" +.005" 8 HOLES .378"/.376" DIA: EQUALLY SPACED. C/BORE TAPPED HOLES. PLAIN PORTION OF SETSCREW TO ENTER C/BORE 1/8" AS SHOWN. RECOMMENDED BRG No S.K.F. 6205. (NOT SUPPLIED BY BORG & BECK) 15 3/8" DIA: OF CLUTCH 12.6275"/12.6225" P.C. DIA: 6 1/2" MAX: DIA: HUB CADMIUM PLATED. 4 DRAIN HOLES 3/16" DIA: EQUALLY SPACED. RELEASE POSITION INITIAL ENGAGED POSITION "WEAR IN" POSITION TO RELEASE CLUTCH APPLY PRESSURE IN THIS DIRECTION. PRESSURE REQ'D ~300LB AT TRUNNION CENTRE. NOTE:- A RETURN SPRING MUST BE PROVIDED ON PEDAL ARRANGEMENT TO MAINTAIN THIS CLEARANCE HOLE DRILLED & TAPPED TO SUIT CUSTOMER'S REQ'MTS. NEW COVER WITH EXTENSION REQUIRED. CENTRE OF TRUNNION SHOULD BE PREFERABLY 3/32" ABOVE C/L OF CLUTCH SHAFT. 1.92"/1.90" DIA 1 1/2" DIA: S.A.E. 10 SPLINE SHAFT DIMENSIONS. 1.247"/1.246" DIA: RELEASE BRG CARRIER IN MAX: "WEAR IN" POSITION. C/L OF TRUNNION SHOULD BE AS NEARLY VERTICAL WITH CROSS SHAFT CENTRE AS POSSIBLE. ALSO APPLICABLE TO R.B. CONSTRUCTION. THROWOUT FORK & CROSS SHAFT MUST CLEAR CLUTCH DURING ROTATION. NOTE:- A FURTHER 1/16" CLEARANCE CAN BE OBTAINED HERE IF NECESSARY. SALES DEPARTMENT. THIS CLUTCH IS SUITABLE FOR A MAXIMUM SPEED OF 5000 RPM. 3/16" MIN: CLEARANCE. 1.275 3 1/16" MAX: FULL SPLINES TO THIS DIMENSION. 5/16" MIN: 1/8" MIN: MAINTAIN THIS DIMENSION. LOWER LEFT NOTES: NOTE:- Flywheel friction face should be 35/45 Carbon Steel, alternatively of good quality close grained cast iron. The friction face should be flat, smooth and polished and should not "run out" more than .003", also the face on flywheel to which the bolting flange is attached should not "run out" more than .003". It is important that the crank-shaft and clutch shaft are co-axial in unit construction. The application of this model clutch is based on the following data: Name of Firm: ROLLS ROYCE Car Model: (BENTLEY CHASSIS 3.5 LITRE) No. of Cyl... Maximum Torque: 210 R.P.M. Date: 19.9.35 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 spline of hub towards the rear. Oil, Grease or Paraffin must not be allowed under any circumstances to be brought in contact with the friction face. TITLE BLOCK & SURROUNDING NOTES: BORG AND BECK CO. LTD. LEAMINGTON SPA. ENGLAND. DESCRIPTION: INSTALLATION 11" A8 CLUTCH PART No. SK.30600/2 DATE ISSUED: 2 - OCT 1935 DRAWN: BWM CHECKED: RPy All Dimensions ± .015 Unless Otherwise Stated. All Corners Free From Fraise. Work to Dimensions. Do Not Scale. 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. F = Good Finish O = Rough G = Ground ⊕ = Machine All Over MADE UNDER ONE OR MORE OF THE FOLLOWING BRITISH PATENTS: 192806.33, 315486. 1930.33, 318535. 289947, 325854. 296392, 340110. 316748, 370218. 316886, 370503. 370191, 370504. 370233, 370234, 31811 SS.{S. Smith} | ||