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).
Issues with propeller shaft needle bearings digging into pins due to being fitted too tightly.
| Identifier | ExFiles\Box 118\3\ scan0208 | |
| Date | 19th November 1937 | |
| To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}2/N.19.11.37. Propeller Shaft Needle Bearings. We very often find bearings where the needle rollers have dug into the pins GB.907 and GB.2311. Kingsbury have found on their own Bentleys and ours, that the chief cause for this is the fitting of the needle rollers too tight in the first place on the diameter. The difference in the diameter of the needle may not be measurable, but if they are selected so that a free rolling movement takes place, digging in of the needles doesnot take place. On the other hand if fitted up on the tight side, they will not roll and digging in soon develops. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||