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).
Condition report on various engine and exhaust components, noting issues with exhaust boxes, silencer lagging, and the magneto drive coupling.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan31 | |
| Date | 12th June 1925 guessed | |
| - 2 - Also in bearing through crankcase for carburetter controls, and accelerator connecting lever from countershaft to cross shaft. Inlet pipe. This is still in good condition. We have now fitted new hot-spot bend S.73592a sent over. Exhaust pipes. These are in good condition. Exhaust boxes. The front box started to crack at flange from dowel hole to inside of pipe. The rear box is again cracked half way round at front side of Nos. 5 & 6 exhaust port. We have noticed that the rear box has so distorted at the bend that it is now fouling induction pipe at this point. We believe that the cracking of the rear exhaust box is due to the bend of the exhaust box endeavouring to straighten out as it becomes hot. This force is exerted along the pipe which, being held by the two dowel pins, opposes the movement of the distortion, with the result that a great stress is put on the centre of the pipe, the underneath portion at centre being strained the most. The result in due course is that the box cracks round the point in question. This same action of distortion, we believe, is the cause of the front dowel flange breaking. Enclosed are sketches showing our views how this distortion takes place. Exhaust silencers. As previously reported the front silencer is almost bare, the lagging having been practically all torn off. The rear silencer lagging is in a similar condition. Silencer brackets are still O.K. Exhaust cut-out. We have had no trouble with this since our last report. Exhaust snout & Swan neck. These are still in good condition. Magneto & Dynamo drive to L.S.C.2019 & 2028. The drive is still in good condition. As previously reported, the fabric coupling nearest dynamo has slightly deteriorated. This may have been caused when taking cover off dynamo to examine brushes, etc. The hole in cover is hardly large enough to pass over the fabric, consequently the outside edge of fabric becomes damaged. We believe the fabric coupling could, without any ill effects, be decreased in diameter approx. 0.125" which would facilitate and prevent damage when cover is removed. Front engine suspension tube to L.S.C. 2027. This is still O.K. Carburetter & fittings. As previously reported, the diaphragm locating pin has worn the hole to an elongated shape. Carburetter butterfly throttle to S. 73166/7/8 - this has not given us any further trouble. | ||