Hydraulic tappet noise at high speeds on a Phantom III 31-EX, detailing spring replacements and further test recommendations.
| Identifier | ExFiles\Box 91\3\ scan0117 | |
| Date | 7th October 1935 | |
| To E. {Mr Elliott - Chief Engineer} c. to Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} X300a (2) Hs {Lord Ernest Hives - Chair} /GWH. {George W. Hancock - Head Chateauroux} 32/KW.7.10.35. Phantom III. 31-EX. Hydraulic tappet noise at high speeds. 4,000 engine revs. 8 to 1 ratio eccentric for rockers. The noise was excessive at 4,000 engine revs, apparently the plungers were not following up at this speed. A 50% improvement has been made by replacing the springs under the plungers. As fitted, E.85321 4.750 lbs. working load. Replaced by E86880 5.750 lbs. working load. We should like a spring giving a working load of 7 lbs. for further tests. Hs {Lord Ernest Hives - Chair} /G.W.Hancock. | ||
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).