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).
Severe case of exhaust valve seat hammering in a Bentley B.19.KU cylinder head.
| Identifier | ExFiles\Box 103\2\ scan0097 | |
| Date | 30th December 1937 | |
| To By... 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} Hs.{Lord Ernest Hives - Chair} Bentley Cylinder Head - B.19.KU. 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? Weak mixture By Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||