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).
Condition and wear of various vehicle components after a test run.
| Identifier | ExFiles\Box 71\4\ scan0214 | |
| Date | 20th May 1925 guessed | |
| - 2 - we now get a pressure of approximately 18 - 20 lbs. on our runs. Leak from oil relay drive is approximately the same as previously reported. This leak is not in any way excessive, but it is there. We have examined the piston, & the leather washer is in a very good condition. This, as you will see in our report, has done 10,000 miles. Leak of oil from centre bolt on top of crankcase - we took out the bolt when changing pistons, but could not find any cause for the leak. After cleaning & refitting, no further leak has occurred. Filter in bottom half taken out & examined. This was clean, but on the cover particles of sand were found. We take every precaution with our oil, & cannot account for this. TAPPETS - we reset these after the first day's run, after which the setting keeps fairly even. The engine generally is clean & free from oil leaks. Exhaust boxes - these are O.K. Front Axle. Modified axle pivots to N. Sch.1896 - these appear to be quite O.K. Modified operating shafts with larger bearings to N. Sch.1895 - there is now slight wear noticeable. Pull rods operating front brakes - these, as stated previously, are slack & cannot be adjusted. The design of these should be altered to accommodate this wear. There is also slight wear taking place on cross operating shafts bolted to front axle. Front road springs. The springs fitted, as previously stated, have now run :- O.S.F. 3,212 miles. N.S.F. 3,962 miles. They are quite O.K. We would like to draw your attention to the springing of front road springs. We have noticed during the test that after approximately 5,000 miles the flexibility of the front springs is very much reduced. This flexibility cannot be brought up again by the greasing of the spring leaves. It appears to be more of a cristalisation of the steel itself which annuls the flexibility of the springs generally. The front of the car in this condition rides very dead. After we had fitted the two new front road springs, the flexibility of the front springs was very noticeable. Undershield. We cannot improve upon our previous report. Exhaust silencers. The lagging on the front silencer is now almost absent. This, as previously reported, is due to the thin aluminium not being suitable for this job, as it is torn open by stones, etc. It is not a case of insufficient support of bands, but the material itself. Rear silencer is as previously reported. Silencer brackets are slightly bent, but they are O.K. otherwise. | ||