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).
Letter discussing the wear and lubrication of pivot pin bushes and a proposed solution for oil spillage.
| Identifier | ExFiles\Box 41\1\ Scan092 | |
| Date | 28th July 1923 | |
| X-3682 ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. Oy5-W-72823 PERSONAL July 28, 1923. Mr. E.{Mr Elliott - Chief Engineer} W. Hives, Mickleover, near Derby, England. Dear Hives: Re Pivot Pin Bushes Replying to your letter of July 13, the question of valves has been taken up in my letter to R of this date, of which you have a copy - Oy2-W-72823. We use the standard 30° seat. Pivot pins and bushes Steele (Service) tells me that the pivot pins do not wear as perfectly as they might, even with the pressure-gun nipple in top of cap and the thrust washers drilled to pass oil through to the pin. He finds that the grinding marks on both bushes and the pin will have disappeared in 6 to 8 thousand miles, both parts worn bright and smooth with about 1 1/2 thousandths total slack in each bush top and bottom. He says they will not wear appreciably more in another 10,000 miles or so. We use gear oil in the pressure gun to lubricate them. This oil (600 W) is almost solid in freezing temperatures but does not seem to cause trouble. A trouble with the pivots now that we have the pressure nipple in the cap is that in oiling the pivot, however carefully it is done, oil wells out over the lower end for half an hour after using the gun and decorates the tires. I send herewith print XA-2855 showing a scoop we are trying out, fixed on the bottom of the pivot and catching drips from the pivot and from the brass spinning, if the hub is overfilled, and spilling that oil clear of the tire. This will fill up with mud in some cases, but even if it does, we think it will drip clear of the tire. It can easily be cleaned out with a hose. Oy. M.{Mr Moon / Mr Moore} Olley | ||