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).
Tests for improved lubrication to rocker adjusting screws.
| Identifier | ExFiles\Box 130\2\ scan0342 | |
| Date | 9th December 1936 | |
| 1113 To Sg.{Arthur F. Sidgreaves - MD} from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} Hs.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} Ry. Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}2/R.9.12.36. 35-EX. Tests on Improved Lubrication to Rocker Adjusting Screws. Two schemes of improved lubrication to the adjusting screws have been run during the mileage in London traffic. The A.{Mr Adams} side had holes drilled through the centre of the screws feeding the oil direct to the spherical seatings. The B. side were kept to the original design, the feeding hole for oil being behind the adjusting screw. On both schemes increased supply of oil was given by drilling a .015" hole in the bronze bush which allows the direct pressure of oil feed to the adjusting screws. This necessitated the stopping up of the valve end of the rocker as too much oil was escaping, which caused smoking of the exhaust when idling. The results of the tests in both cases have shown that the extra supply of oil has proved beneficial to the spherical rubbing faces of the adjusting screws and the cups of the push rods. The A.{Mr Adams} side which have run 2,566 miles are in a very good condition; one seating only shows signs of scratches where evidently foreign matter had got under the seating. The B. side are in a good condition, and the scheme could be brought into production without any alterations to design. The cutting off of the supply of oil to the valve end of the rocker has led to wear taking place on the rubbing face of the pad operating the valve. The oil supply will have to be maintained to this point as is at present used, but a modification is needed to control the supply. We propose to control it by stuffing the bored hole in the rocker with worsted wool and asbestos. The two schemes to be tried. Rm{William Robotham - Chief Engineer}/G.W. Hancock. | ||