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).
Analysis of end stud tension and torque settings for engine cylinder liners.
| Identifier | ExFiles\Box 179\3\ img171 | |
| Date | 6th April 1932 | |
| -2- Hs{Lord Ernest Hives - Chair}/Lov.{Mr Lovesey}4/MJ.6.4.32. Cont'd.{John DeLooze - Company Secretary} The end studs give the greatest tension and apart from this increased tension due to the higher efficiency the end liner joints are subjected to a greater clamping load due to the tension not being shared by adjacent liners, as in the case of the intermediate liners. We have never had any indication of trouble through high clamping loads at the end cylinders and it can be said that in cases where engines have been returned for cylinder leaks the end liners have always been in good condition. From these facts it would appear that a higher screwing down torque could be employed for the intermediate studs than used at present (85 lbs.ft.) and give a greater safety margin. We are now going to test an engine with the torque increased to about 120 lbs.ft. to see what limit we can reach with over tightening before running into other troubles. Hs{Lord Ernest Hives - Chair}/A.C. Lovesey. | ||