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).
Test report on gearbox cooling, clutch performance, engine coupling, and Cadillac type gears.
| Identifier | ExFiles\Box 91\3\ scan0219 | |
| Date | 23th September 1935 guessed | |
| ( 9 ) also a seperate guard for the front brake dashpot. This tested, was satisfactory during two days run in bad weather. We removed the undersheet from the Gearbox to see what effect it would have on the oil temperature. On two days running the temperature was lowered by 19°C. We then fitted a modified undersheet to protect the servo and working parts, keeping the under part of the gearbox open for cooling. With this arrangement taking an average over six days, the oil temperature of the gearbox was reduced 8.5 %. To protect the servo, we had to fit a shield in the cross. Sketches show both schemes. FLYWHEEL & CLUTCH LOP G 83362 EX 18913 INERTIA RING G 82602. FRICTION LININGS VM 20. The engagement of the clutch with the EX 18913 ring & VM 20 linings was not too good. With a fairly quick engagement, the drive could be taken up smoothly. To attempt to engage slowly, it jaggered and grabbed upon final engagement. When reversing, the jaggers were more pronounced. When hot it was very slow stopping which has an adverse effect upon gear changing. [Handwritten note in margin: Ll Smith, what dry, what wet, smallest jagger?] At 7,081 miles, we fitted a new centre plate and linings to the clutch to HS{Lord Ernest Hives - Chair} 2179. We still had slight jaggers and grabbing upon final engagement as previously. There was no perceivable difference between the two clutch driving plates. When dismantled there was no trace of oil inside the clutch. The Flywheel showed no trace of chattering or looseness where attached to crank flange. The joint of the pressure pipe for rear engine bearing cap showed traces of oil leaks. The rear clutch bearing had been over-lubricated and oil had run down inside the case, no appreciable wear had taken place. The clutch spiggot in the flywheel was rusty. The splines showed slightly, hard marks, which were eased off. ENGINE COUPLING. LOP G 82471 NS{Norman Scott} 4578. The Hardy Fabric coupling shows no signs of stress. It was in a 100 % condition. The coupling spiders and bolts had remained firm, condition good. When the clutch was disengaged quickly, there was a loud clanking noise from the transmission. Chunking in the drive at low speeds was prominent. GEARBOX. N. 4 HS.{Lord Ernest Hives - Chair} CADILLAC TYPE GEARS. The second and third gears were a good standard for quietness throughout the mileage. The first and reverse were on the heavy side. The continuous gears which were quiet at the start, developed a whine towards the finish of the mileage which could be heard if the engine was run rather fast idling. The change of gears has been poor, 3rd and top. | ||