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).
Servo motor friction lining performance and failures of various exhaust system components.
Identifier | WestWitteringFiles\W\May1931-August1931\ Scan095 | |
Date | 5th August 1931 guessed | |
-4- SERVO MOTOR MECHN: (COUNTERSHAFT) to LOP.E.76740. SERVO MOTOR MECHN: (GEARED) to LOP.G.77669. Servo Operating Levers 45° Ball Bearing Type Cams - to drgs: Ex.6291-2-3-4. Special Friction Linings - Die Pressed Ferodo R.A.D.13/047 - secured with Staples. We have been trying special friction linings (Die Pressed Ferodo), also servo operating cams, ball bearing type, on the servo. The efficiency and smooth application of the servo was very good for 11,000 miles. It then became very sluggish in action and would not free itself. We found upon examination that the cause was due to dust from off the linings having jammed the three driving pins in the bushes. After clearing these out the servo has again become smooth and efficient during the further running of the car. EXHAUST FITTINGS to LOP.E.80644. (1) Exhaust Downtake Expansion Box and Intermediate Pipe produced in M/S. and Fescolised. (2) Exhaust Laggings M/S. and Nickel Plated .002 thick. (3) Extended Rear Exhaust Pipe E.82317 - Scheme 1471. (4) Standard Exhaust Manifold. The above exhaust fittings were fitted with a view of cheapening the cost of production. The front expansion box had started to fail by the time we reached Chateauroux from Derby, afterwards quickly failing, the metal cracking round the joint of the downpipe and at the joint of the outlet pipe. The stay holding the front expansion box also buckled. The failing of the front expansion box, we believe, was due to the sliding joint not functioning correctly, causing strains to be placed upon the joints mentioned. We have since obtained another expansion box and pipes made of mild steel, and up to the moment they have not shown any signs of failing. The sliding joint is working correctly. There appears to be a great tendency to make the sliding joint too tight a fit, the object being to reduce any tendency for exhaust blows. We would also like to point out that the open end of the sliding joint would be better if placed at the rear and not at the front. In this position it is open to all dirt that is thrown up by the road wheels. The exhaust manifold does not show any sign of failing. The nuts holding the exhaust manifold have remained firm. Standard grover washers are fitted under the nuts. There is always a complaint from N. that these nuts do not remain tight. The rear silencer and extended swanneck with the extra bracket attached have given no trouble. | ||