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).
Faults found in the 40/50 HP chassis, including issues with the tool kit, induction system, and throttle.
| Identifier | Morton\M1.4\ img018 | |
| Date | 9th November 1921 | |
| To BY.{R.W. Bailey - Chief Engineer} from DA.{Bernard Day - Chassis Design} -6- R7/C9/11/21 Contd. I believe most of the gear box noises are caused by over-tight ball bearings. 40/50 H.P. CHASSIS. (xxxxxxxxxxxxxx) (25) TOOL KIT. (second fault) In removing one of the rear hubs of chassis 6 EX, I found that the box spanner provided for unscrewing the three small nuts holding the lock plate which engaged with the castellations on the axle tube was too short, and another fault that it possessed was that of sliding right over the nut on account of it being a broached spanner. I think we should revert to that form of box spanner made from tubing, which has not the latter fault, or provide two or three pins to prevent this fault being noticeable in ignition plug spanner. As the tube spanner "B" in fig.64 page 111 of the instruction book could not be found, three holes were drilled in the road wheel driver and three pins driven through these holes to engage with the axle tube nut. The axle tube nut was then unscrewed by means of the purchase offered by the brake drum. Whoever is responsible for the tool kit in Derby should take a car and perform with it any of the jobs that should be required. Mr. Platford should see that the Kit is complete and efficient. (26) INDUCTION PIPE AND CARBURETTOR SYSTEM. The starting carburettor is not yet in a fit state for manufacture, and a design will be prepared for the starting some-what on the lines of the "Goshawk II" but mounted on the induction pipe as now, the nut and nipple connection of the one which was fitted to chassis 6 EX. at West WitteringHenry Royce's home town is somewhat unsatisfactory owing to the nipple unscrewing from the body of the cock. (27) EXHAUST HEATED THROTTLE. With regard to the butterfly valve for diverting the stream of exhaust gas through the throttle jacket, Mr. Hives suggests that this would stand up better in cast iron and I agree to this material, at the same time, the spindle should be of stainless steel. The distribution with the exhaust heated throttle has been improved, Mr. Hives reports, by increasing the size of the induction pipe from 1 1/2" to 2", altering the throttle casting to suit, and actually using the same core box as at present used for the standard hot water throttle. I agree to these alterations. With regard to the scheme for the carburettor on the exhaust side of the 40/50 H.P. engine just handed to Mr. Hives, we would like a supply of hot air arranged for the low speed jet, as we have an opportunity of doing so effectively with the exhaust system so near. Hot air is not required at full throttle openings, and the high speed jet should therefore not be included. R.{Sir Henry Royce} | ||