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 from France detailing issues with tyres, noisy tappets, brakes, and water pump rattles on a vehicle.
| Identifier | ExFiles\Box 125\2\ scan0154 | |
| Date | 19th November 1934 | |
| X1729a Hotel de France, Chateauroux. Indre. France. To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From GWH.{George W. Hancock - Head Chateauroux} 19th November 1934. We have sent you the following telegram:- "21 G IV HAS COME OUT WITH STANDARD SILENT TREAD TYRES. WE HAVE NO STOCK OF TYRES FOR THIS CAR. USED ALL UP ON LAST TRIP." Your memo Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} 1/KW 17.11.34 states that you wish us to give our opinion on the "90" type Dunlop tyres. We should be much obliged if you will send out 8 Dunlop tyres "90" type - 6 x 19. (Four tubes only) With reference to our report Cadillac noisy tappets. These have got consistently worse and now clatter when running slow. The cause is due to the plungers not holding the eccentric bearings, which are oscillating and clatter on the plungers. The oil pressure is ten to fifteen pounds. We have dismantled the set on the OS. and found a quantity of oil sludge in the oil supply holes of the rockershaft, which supply the hydraulic plungers. We have also dismantled the oil cleaner, but its condition does not warrant any loss of oil pressure to the rockershaft. We are, therefore, building the rockershaft up again. We shall then be able to say whether it is due to the partial blocking up of the oilways or not sufficient oil pressure. Re Brakes. We bought a set of Cadillac brake linings from the Cadillac Depot in London and have relined the OS. rear. The NS.{Norman Scott} we have found that the adjusting screw was being prevented from further adjustment by dirt in the threads. We shall be able to adjust this brake further before lining. Water pump drive rattles. The rattles come from the couplings at either end of the drive, and not from any source of wear in the bearings. The driving chain may have stretched a little. The drive is made up of fibre driving blocks let into housings and given 1/32" end clearance and 1/64" in fit. We shall hold the car up to attend to the above, also to replace several bolts in front which have either been lost or broken. We thank you for the blue prints and memo dealing with the spectreCodename for Phantom III steering. G.W.H. | ||