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).
Issues with tappet clearance on the 20 HP model and recommending the adoption of the E.A.C. type of tappet adjustment.
| Identifier | WestWitteringFiles\J\May1923\ Scan72 | |
| Date | 28th May 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to EY. ORIGINAL. 20 HP. - TAPPET ADJUSTMENT. Y4226 When the cam is on the top of its lift, there is very little clearance before either the spring becomes choc-a-bloc or the valve washer on the top of the valves fouls the washer at the bottom which encloses the felt washer. After the first case of the trouble, the clearance was increased, and the Works now make certain that there is .040" minimum clearance. We recommend, that as soon as convenient, we adopt the E.A.C. type of tappet adjustment on the 20 HP. This should prevent this trouble ever occurring. It would also enable us to make the tappet covers a more permanent and oil-tight job. Hs.{Lord Ernest Hives - Chair} | ||