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).
Letter from Leyland Motors discussing cracking issues with screwed-in valve seats in aluminium alloy cylinder heads.
| Identifier | ExFiles\Box 140\3\ scan0224 | |
| Date | 11th November 1938 | |
| 1175 Leyland BY APPOINTMENT TO THE LATE KING GEORGE V.{VIENNA} LEYLAND MOTORS LIMITED, Head Office and Works, Manufacturers of Motor Vehicles. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS CUSTOMERS' VEHICLES DRIVEN AT OWNERS RISK ONLY TELEGRAPHIC ADDRESS: LEYMOTORS, LEYLAND. TELEPHONE: LEYLAND 81400 (16 LINES) LEYLAND. LANCASHIRE. YOURS IN REPLY PLEASE QUOTE: OURS VWP/HK.{Col. T. Harker - Sales} Tel: Ext: 97. 11th November, 1938. Dict. 10th. W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce, Ltd., D E R B Y. Dear Mr. Robotham, During one of my recent visits to Derby, some discussion took place on the subject of aluminium alloy cylinder heads. I believe I am correct in stating that where this type of head is utilised on your productions you employ valve seats of the screwed-in type, manufactured from one of the alloy bronzes. We have recently struck a rather big trouble in a similar type of head, whereby when the valve seats are screwed-in the metal between the valve seats appears to lift and actually starts a crack at the base of the threaded portion. I would very much appreciate hearing whether you yourselves have at any time experienced this trouble, and, if so, whether you were able to satisfactorily to overcome such a difficulty. Yours faithfully, M Pilkington | ||