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).
Repair procedure for a cracked cylinder block on a Bentley chassis.
| Identifier | ExFiles\Box 146\1\ scan0163 | |
| Date | 11th January 1938 | |
| To Bentley Motors Ltd. Derby c. to .............. By.{R.W. Bailey - Chief Engineer} Rm.{William Robotham - Chief Engineer} Levallois 1245 Sr/VAL/GM.II.I.38 STEADMAN re: BENTLEY CYLINDER BLOCKS CHASSIS B.125.GP - Mr. FAURE. While carrying out repairs to the engine of the above chassis and after fitting the cylinder block etc.. in position, we observed that the bosses into which are screwed the two E.18623 studs which hold the pump bend were found to be cracked as indicated in red on the sketch attached. In order not to scrap the cylinder block , we carried out a repair job as per our sketch. We machined a steel plate of 2.000" dia. leaving the external diameter slightly taper and tapped same into position in the cylinder much in the same way as when strutting early Phantom 1 cylinder blocks, the plate was so finished as to exert the most pressure on point 'C' and 'E' on sketch. Prior to fitting the plate, we drilled 4 .500" water passage holes in it. We also made a steel tube and tapped it into position into the cylinder block so as to throw pressure on point 'F' and 'H' . After carrying out the above the studs appeared to be held firmly in position. We are rather concerned at the above happening and we can only assume that the cracks were set up at the time the studs were fitted. Should we come across a similar case in the future, we have an idea in mind in order to save a cylinder block whereby a special machined water jacket cover for the pump inlet could be made and into which the studs could be fitted and if the cover were held in position by additional fixing screws, we do not think that there would be a risk of a water leakage between the cover and the cylinder due to "pull" from the water pump. We shall be glad to have your views concerning the above. Of course, it will be observe that we have reduced the water passage of the pump inlet , but we think that this will be off set by the holes which we have drilled in the plate and also due to the fact that the plate has been driven into position below the surface of the machined portion of the cylinder jacket. Sr/VA. | ||