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).
Standardisation of parts for the Phantom III, detailing the deletion of hydraulic tappets and introduction of solid rocker gear.
| Identifier | ExFiles\Box 171\5\ img011 | |
| Date | 4th November 1937 | |
| RR 755 (10H) (49988) 19/10/37 C.E.Co. COMPLETED 18.1.38. PHANTOM III STANDARDISATION OF PARTS Description: SOLID ROCKER GEAR (DELETION OF HYDRAULIC TAPPETS). Purpose: Improved reliability and reduction in cost. Date Issued: 4.11.37 Sheet No.: P.10. Drg. No.: L.O.P.S. Brief Report and Remarks Ran satisfactory 15,000 miles in France on 32-EX. Also fitted to 35-EX and 37-EX. Recommend tappet clearance .008 cold. Cylinder heads must be E.88758 and not E.89206 which needs testing before adoption. When recommended for Introduction: 1st. in D.{John DeLooze - Company Secretary} Report References: Rm{William Robotham - Chief Engineer}/Swd1.5/AP.988 By Rm{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design} Mx{John H Maddocks - Chief Proving Officer}, Rm{William Robotham - Chief Engineer}/Swd15/B.1637, Rm{William Robotham - Chief Engineer}/Swd1.2/AP.18937, Rm{William Robotham - Chief Engineer}/Swd1.5/AP.7837, Rm{William Robotham - Chief Engineer}/Swd1.7/AP.1.10137 Table of Costs: Old Parts: Royalty £0.8.5. Material £7.0.9. Labour £17.13.6. Burden £30.18.8. Total £56.1.4. New Parts: Material £5.12.3. Labour £10.8.6. Burden £18.4.11. Total £34.5.8. Decrease in Cost £ 21. 15. 8. G/RH{R. Hollingworth} 31/12/37 Production Position and Comments Cost of Tools £ 300.0.0d. Solid rocker gear to be introduced at 1st. chassis in 'D' series, reduces Factory cost of Chassis by £21.15.8d., due to deletion of hydraulic tappets and simplification of bottom tappet clamps. Nett. cost of material rendered scrap is £1350.0.0d. and tool cost is £300.0.0d. (principally for new camshaft and tappet block tools). The combined tool and scrap cost of £1650.0.0d. will be recovered after producing 76 chassis with solid tappets, and a decrease in Policy and Guarantee charges is also anticipated with the simplified design. Authorisation to Proceed. Introduce on the 1 Chassis in D Series. Sg.{Arthur F. Sidgreaves - MD} RHC{R. H. Coverley - Production Engineer} Date 17-1-38. Hs.{Lord Ernest Hives - Chair} HS{Lord Ernest Hives - Chair} Date 17/1/38 | ||