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).
Inspection reports on a pump following 2-hour and 50-hour endurance tests.
| Identifier | ExFiles\Box 149\2\ scan0199 | |
| Date | 12th April 1939 guessed | |
| -2- REPORTS :- Inspection reports were issued on the condition of the pump at the end of each endurance run, and these were as follows :- (1) After 2 hours Test :- In relation to its initial condition, the pump at the end of 2 hours endurance at 2000 r.p.m., 25 lbs. per sq.in. pressure using Motorine "C" at 75°C was in general, good. There was slight evidence of "scruffing" on the walls, and also on the driven gear, non-thrust facing of the casing. Due to the unevenness of the casing faces, and accurate dimensional check of the depth (and consequently the end clearances) was not practicable, but as far as could be ascertained there was no change after the two hours run. The radial clearance which could be measured more accurately was also unchanged, and apart from the settling down usually experienced, the gears and bushes were unaltered - the maximum variation registered being .0004". The thrust plate showed evidence of contact with the gears and the bedding on the plate was uneven. This plate, however, was initially buckled - .001" wear being registered at the contacting surfaces. The delivery which was initially below that for the standard Wraith pump, was unaltered after the test. Other than slight "sweating" at the joint faces, no leakages were evident. (2) After 50 Hours Test :- When stripped and inspected after the 50 hour test, the pump was still in good condition. The radial gear clearance showed a slight increase - the maximum, however, being only .0005". The end clearance showed a decrease of .001" showing either distortion or shrinkage of the Bakelite, but as previously recorded, the casing depth was too uneven to define accurately. Of the bushes, those locating the driving gear showed the most wear, which was, however, less than .00075", whilst the maximum wear on the shaft was .00025". The thrust plate wear had not increased, although the contact area of the idler gear was somewhat larger than at the previous inspection. Continued........ | ||