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).
Inspection report on a dismantled cylinder head detailing valve condition and issues with broken split rings.
| Identifier | ExFiles\Box 11\5\ 05-page200 | |
| Date | 17th October 1934 | |
| V7941 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}5/KW.17.10.34. 28-EX. We have dismantled the cylinder head and examined the valves. The exhaust valve seatings were free from pitting and showed no signs of burning. The three valves with the stellite seats were in no better condition than the standard. The cylinder seating had distorted slightly. The car has of course only run 5,000 miles since we recut the seatings and ground the valves in. We took the opportunity to lift the cylinder blocks and examine the tappets of Nos. 2, 3 and 4 cylinders. They were in a very good condition, only a line contact showing. We found three of the split rings for preventing the valves dropping into the cylinder broken, two missing. Apparently it is an easy matter to dislodge these rings when fitting the valve springs. It occurs when the springs are being compressed to fit the taper wedges. The spring being pushed over makes the top washer foul the split ring and pushes it out of the groove. Hs{Lord Ernest Hives - Chair}/G.W.H. | ||