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).
Investigation into water leaks from a Bentley cylinder plate and water bend joint, detailing causes and recommended solutions.
| Identifier | ExFiles\Box 103\2\ scan0107 | |
| Date | 31th March 1937 | |
| GWH{George W. Hancock - Head Chateauroux} To Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} from RHC{R. H. Coverley - Production Engineer}/Cy. c.c. to E/JNR.{Charles L. Jenner} c.c. to RHC.{R. H. Coverley - Production Engineer} RHC{R. H. Coverley - Production Engineer}/Cy.1/LS.31.3.37. WATER LEAKS FROM BENTLEY CYLINDER PLATE AND WATER BEND JOINT. We find the works are fitting a "Dermatine" joint washer between the plate and pump bend as called for on LOP. We have also investigated the cracking of the stud bosses and find this is invariably due to the studs being a rather easy fit in the tapped holes, necessitating screwing down tight to the last thread to prevent leakage, this procedure puts a bursting strain in the thin section of the metal between the tapped holes and the water way. After running, a crack develops at this point. To overcome this possibility we have instructed that the holes shall be tapped -.002 on effective diameter, thus securing a good fit along the full length of thread and thereby making a seal without the necessity of jamming the last thread of the stud. Studs are also put in with wet enamel. We would draw special attention to the thin section of metal between the stud hole and the water way, and recommend that this is increased by spreading the stud centres. The corresponding section of the washer would also be increased in joint areas, with a decidedly less possibility of leakage. RHC{R. H. Coverley - Production Engineer}/Cy. [Signature] | ||