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).
Reducing gear end clearance to prevent oil pressure drops, including a diagram showing potential wear points.
| Identifier | ExFiles\Box 149\2\ scan0219 | |
| Date | 13th May 1941 | |
| -cont'd- - 2 - Jnr.{Charles L. Jenner} /SW.13.5.41. of leaks, an experiment worth doing is to reduce the end clearance of the gears in the casing by removing the joint washer, we can hardly need it when it is submerged in oil and is inside the sump. With the washer the clearance is about .008 and if wear occurs on the face of the alum cover due to thrust from the helix, the comparatively large gap may cause a drop in pressure. [Diagram showing a cross-section of a gear casing, with handwritten labels 'GAP' and 'POSSIBLE WEAR'] On 30-G-Vll. after 15,000 miles, we recorded 39 lbs. at 90°C. and 7 lbs. per square inch when idling, now what have we introduced during the development to spoil this? It may be the drilled up Camshaft. Jnr.{Charles L. Jenner} [signature] | ||