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).
Causes of over-oiling problems in the Phantom III 'DL' Series engines.
| Identifier | ExFiles\Box 131\2\ scan0244 | |
| Date | 17th August 1938 | |
| To Bv...... from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} SWDL{Len H. Swindell} 1113 c. Rm.{William Robotham - Chief Engineer} c. Mx.{John H Maddocks - Chief Proving Officer} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}7/N.17.8.38 Phantom III - 'DL' Series. It would appear that the 'DL' series are in trouble with over oiling. L.A. is now dealing with 3.DL.4. sent up last week. This is a similar case to 3.DL.2 which was dealt with at N. and which was reported upon in my memo Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}10/N.22.7.38. In the latter case the over oiling was mostly due to top and was due to a combination of several items, such as excessive oil from the rocker arms on to the valve stem pad, leak of oil from rocker bearings on to the valve springs, an annulus in the bottom spring washer feeding oil into the grummet. All three combined to cause the trouble. Oil feed to rocker cut down to a minimum. There was no single item that one could say was effective. There is also a feeling with the four port head that the distribution is not all that could be desired. The condition of the plugs gives this impression, 5 and 6 showing richness. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||