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).
Brake failure on chassis 3-AX-121 due to faulty adjustment.
| Identifier | ExFiles\Box 96\1\ scan0333 | |
| Date | 8th July 1938 | |
| To Br.{T. E. Bellringer - Repair Manager} c. To Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} C. Rn.{Mr Robinson} Da.{Bernard Day - Chassis Design} Mx.{John H Maddocks - Chief Proving Officer} RHO. LA.{L. A. Archer} Hd.{Mr Hayward/Mr Huddy} A.F.M 361. BY.19/N.8.7.38. A.G.CLARKE - CHASSIS 3-AX-121. Re: COMPLAINT No. N.1162. The brake failure on this car was apparently due to faulty adjustment, in that the rod was not screwed far enough into the jaw. There should be approximately .625 of the threaded portion of rod engaged in the jaw. This being the case, the clamping device provided should be an adequate safeguard to prevent the rod becoming loose or unscrewing. There should be no necessity for an additional lock nut, in fact if the rod is screwed into the jaw the correct amount, there should not be sufficient thread left for a lock nut. We would like to inspect the screwed rod and jaw belonging to this car, and to enable this to be done with the least inconvenience to the customer, we will send replacement pieces to N. the existing parts to be returned for my attention. On later series P.III, 'B' series onwards, by a re-arrangement of the rear brake mechanism, this particular part is superseded by a non-adjustable rod. With regard to 'A' series, fitted with screwed rods, since it is not intended for this piece to be adjusted in service the adjustment being provided for initial assembly only, and this is clearly stated in the Instruction Book; it is proposed to instruct Depots to secure the jaw by means of pegging and rivetting. BY.{R.W. Bailey - Chief Engineer} | ||