Exhaust valve seat damage on a Bentley cylinder head.
| Identifier | ExFiles\Box 89\4\ scan0220 | |
| Date | 30th December 1937 | |
| To By... (Struck through) from Rm {William Robotham - Chief Engineer} /GWH. {George W. Hancock - Head Chateauroux} c. to Rm. {William Robotham - Chief Engineer} RHC. {R. H. Coverley - Production Engineer} (Struck through) Hs. {Lord Ernest Hives - Chair} (Handwritten) Ideas 261 Rm {William Robotham - Chief Engineer} /GWH. {George W. Hancock - Head Chateauroux} 5/N.30.12.37. Bentley Cylinder Head - B.19.KU. (Handwritten) SWDL {Len H. Swindell} Mileage 7,730, Came in for an R.10. We have had a very bad case of the exhaust valves eating into the seatings. No.1, 3, 5 and 6, the seats had been hammered away to a depth of approx. .020. It is the first case of bad hammering I have seen in service. We are of the opinion that it has been run for long periods on the valve bounce period. What is your opinion please? Rm {William Robotham - Chief Engineer} /GWH. {George W. Hancock - Head Chateauroux} (Handwritten Side Note) This might be lack of cooling. Le Mans experience? Rm {William Robotham - Chief Engineer} | ||
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).