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).
Hand-drawn diagram illustrating the seating and contact points of an exhaust valve.
| Identifier | ExFiles\Box 5a\3\ 03-page039 | |
| Date | 19th March 1931 guessed | |
| Exhaust Valve Seating line of valve hammering in seat very light contact of valve with seat. hammering into corner of seat. box not large enough to allow for any discrepancy in boring valve stem guides | ||