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).
Report from France detailing issues and adjustments related to brake squeaks, shock absorbers, and front control arms.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page073 | |
| Date | 26th November 1932 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hotel de France, Chateauroux, FRANCE. 26.11.32. 2.PER.II. We are sending you sketches of a brake toggle connecting link which has collapsed, and a rear shock damper bracket which has broken. We have been trying to locate the springiness in the rear brakes, and from our tests we are of the opinion that the toggle shaft winds up and the drum springs too much. There is also a possibility that the connecting links are springing, hence the collapse of the one shown. RE. BRAKE SQUEAKS. We have cut out the flexible shoe and will report upon squeaks or groans, but from our previous expensive experience, one car is not sufficient to prove it out. We do not agree that 1" pedal movement is lost, great care has to be taken with regard to the bedding of the shoes. We have found that we can get an inch lost movement because of the shoes not bedding solid. We are going into all this as our brakes are hopeless after the fitting of the longer levers. There feels nothing solid anywhere. SHOCK ABSORBERS. We are reducing the poundage to 80, i.e. fitting an extra .010" washer under the set screw. The poundage works out approx. 1 lb. per .001" difference. We have replaced the asbestos packing in the gland of the N.S.R. damper by the washers sent out. We note there are oil resisting and non oil resisting rubber washers. We have fitted the oil resisting washer. RE. FRONT CONTROL ARMS. The knocking at the front developed worse and was traced to the contacts for the ballend of the control dampers. We found upon dismantling those that the rear contacts (solid) were in a very bad condition, they had been hammered to pieces. We have cleaned them up and reset the axle bracket to throw it more forward as the lean of pivot was being altered by this bracket, the solid contacts not being screwed far enough up. The part may be too weak, we will watch the results. Is the spring strong enough for its work, we have given .015" working clearance. G.W.H. | ||