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).
Issue of bent push rods on a 20HP engine and potential solutions.
| Identifier | ExFiles\Box 48\4\ Scan090 | |
| Date | 30th May 1923 | |
| X.4226 To BJ. from R.{Sir Henry Royce} c. to CJ. c. to BY.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} c. to EP.{G. Eric Platford - Chief Quality Engineer} R1/M30.5.23. 20-HP. BENT PUSH RODS X.4226. In reply to your memo. BJ11/H25.5.23., probably the clearance as actually made in valve spring or somewhere is sufficient, and can, and should be increased to one tenth of an inch minimum. A thick inerea felt washer would make it wrong. Probably the fault reported is due to adjusting the tappets when the valves were not seating properly, in which case the adjustment would be so high that the valve would jam either in the springs or elsewhere. Cast on the top of the valve cover these instructions (or something better) :- "DO NOT READJUST VALVE "TAPPETS UNLESS SURE "VALVES ARE SEATING "PROPERLY". We have tried and cannot re-arrange valve adjustment so that it cannot come out more than clearance allowed in valve mechanism. Carry spare rods. All rods are to be exactly the same length, and if changed cause no harm. All known valve mechanisms with adjustment have this trouble. We have a new scheme where the adjustment is limited naturally. R.{Sir Henry Royce} | ||