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).
Response to M. Poberejsky regarding chassis II5 MC, discussing incorrect micrometers and bearing test methods.
| Identifier | ExFiles\Box 47\1\ Scan367 | |
| Date | 3rd February 1926 | |
| “Hs{Lord Ernest Hives - Chair}” Works copy “Hs{Lord Ernest Hives - Chair}” Works. X417 PsI/Crn.3.II.26. Re: Chassis II5 MC - M.{Mr Moon / Mr Moore} Poberejsky. We thank you for your memo. Hm{Capt. W. Hallam - Head Repairs}4/W.25.10.26 and for the useful information contained therein. The writer regrets that, through lack of time at that particular period, not having verified the information given in the report referred to, which verification would probably have avoided the errors being communicated. However, it has since been proved that our micrometers are wrong, and we have asked our man Shepard, who is at present at “W”, to get into touch with you for a supply of standard gauges for testing micrometers. The 5000 miles referred to in your memo., should read 5000 kilometres. We are sorry you are under the impression that we did not make full use of the details sent from the Experimental Dept., we are rather anxious to tell you that such information is eagerly read and digested by all concerned at least in Paris, and we were guided by that information to rig up the tests which we referred to in our shops report. You must bear in mind, of course, that we were not out to know if all the bearings were leaking, which could be proved by the quantity test at given temperatures and pressures, but rather to find out if any particular bearings were leaking more than others; hence our tests were modified similar to those we used to practice in the pre-war days on pre-war cars for over-oiling. We did prove that oil was being thrown out at a particular place or places, and acting upon this information we decided to dismantle the engine and inspect the bearings, which we described in our shop’s report referred to above. It is rather a remarkable coincidence, that “W” should suggest the method of testing play in the bearings by the use of fuse wire, or what is more technically known as “leads of bearings”. We have employed this method for some considerable time on bearing jobs, and we did take leads of certain bearings on this particular engine, and for your edification and consideration we are sending you, herewith, those two leads which we retained, taken from N° 5 big end bearing, which had much more play than any other. We shall be pleased if you will show these leads to “H”, because they are rather interesting as not only giving the amount of play, but getting a good impression of the Turkey substance which we found in the bearing. | ||