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 report detailing adjustments and issues with engine components including valves, gears, and cams.
| Identifier | ExFiles\Box 72\4\ scan0038 | |
| Date | 1st October 1923 | |
| Contd. RHC{R. H. Coverley - Production Engineer}2/LS1.10.23. 6. Eccentric Valve Adjustment. As already discussed with you, it will be necessary if this scheme of Valve Adjustment is adopted, that each eccentric Bush is locked independently. As at present arranged, one section of 3 Rockers are slacked off, one is selected for adjustment, the necessary adjustment is carried out, but the other 2 are taking the Valve Spring load which unless eccentric Bushes are held, setting on these is disturbed. 7. Timing Gears. An attempt has been made to quieten these Gears but they are still rather noisy, owing to the cross bedding of Dynamo Pinion and Idler Gear. On examination we find that bore for Dynamo Drive in Crankcase is badly out of line with the other bores, apparently the Top Half must have been disturbed during the boring operation. The only way to rectify, is when convenient to have the Case re-bored and the Housing made to suit. Until this has been done it will be impossible to quieten Gears satisfactorily. You also mentioned the coarser pitch Timing Gears, perhaps you will take this up with D.O. 8. Cam Bores. The Bores as at present arranged vary in Size .010 to facilitate assembly. The question arose from T.O. as to whether this was necessary, there is no doubt it is the best arrangement, as it enables Camshaft to be assembled complete with bearings, and then threaded in Case. It would be very difficult to assemble inside Case as in Gos 11. and 40/50 practice. 9. Tappet Guides. One or two Cams were scored slightly owing to Roller only making line contact. The Location Plate not being sufficiently robust, allowed the Guide to follow the Reamer Track and wind when being pulled in. The Reamer used for this operation had eight flutes evenly-pitched, which would account for the trouble mentioned. Reamer having odd No of flutes and unevenly pitched is now being made to obviate this trouble. Contd. | ||