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 A3 clutch from Borg and Beck.
| Identifier | ExFiles\Box 129\2\ scan0057 | |
| Date | 14th June 1938 | |
| 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.W.F. 6205 (NOT SUPPLIED BY BORG & BECK) 1.27" +1/32 -1/32 7/16" 9/16" MAX: RELEASE POSITION INITIAL ENGAGED POSITION "WEAR" 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 CUSTOMERS REQ'MTS NEW COVER WITH EXTENSION REQUIRED. CENTRE OF TRUNNION SHOULD BE PREFERABLY 3/32" ABOVE C/L OF CLUTCH SHAFT. .192"/.190" DIA 1.247"/1.246" DIA 1 1/4" DIA: S.A.E. 10 SPLINE SHAFT DIMENSIONS. RELEASE BRG CARRIER IN MAX: "WEAR IN" POSITION. C/L OF TRUNNION SHOULD BE AS NEARLY VERTICAL WITH CROSS SHAFT CENTRE AS POSSIBLE. THROWOUT FORK & CROSS SHAFT MUST CLEAR CLUTCH DURING ROTATION. NOTE:- A FURTHER 1/8" CLEARANCE CAN BE OBTAINED HERE IF NECESSARY. SALES DEPARTMENT. THIS CLUTCH IS SUITABLE FOR A MAXIMUM SPEED OF 5000 R.P.M. 2.250" ±.005 PREFERABLE DIM. 1.125" ±.0025 1.375" ±.0025 .562" +.001 -.00 2.750" ±.005 TO SUIT EXISTING THRO-OUT FORK. 3.375" PREFERABLE DIM. 1.687 VIEW IN DIRECTION OF ARROW 'A' 1.500"/1.499" BORE OF CARRIER CASE HARDENED STEEL TRUNNION BLOCKS MUST BE FREE ON PINS EXISTING THROWOUT FORK PREFERRED THROWOUT FORK 3.800" ±.005 13 3/8" DIA. OF CLUTCH 12.6275"/12.6225" P.C. DIA: 6 1/2" MAX DIA: HUB CADMIUM PLATED. 4 DRAIN HOLES 1/8" DIA: EQUALLY SPACED. 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 to see 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 (MK VI) (crossed out) 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 driver plate is assembled in correct position, as illustrated below, 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 friction face. BORG AND BECK CO. LTD. LEAMINGTON SPA. ENGLAND. DESCRIPTION. INSTALLATION 11" A3 CLUTCH. DATE ISSUED 14 JUN 1938 DRAWN TB 2.35 CHECKED RPY | ||