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).
Failed valve spring washer and excessive engine gear noise on the Goshawk 11 engine, recommending an oil system modification.
| Identifier | ExFiles\Box 75\1\ scan0231 | |
| Date | 13th September 1921 | |
| 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 BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to EP.{G. Eric Platford - Chief Quality Engineer} COPY X4247 Hsl/LG13.9.21. X4247 GOSHAWK 11. X.4219 We have had one of the valve spring washers break on Goshawk 11. engine on the Test Bench. We are sending the sample to Mr. Royce. These washers, we believe, are instructed to be made by hot pressings. The one which has failed was a machined one. We get considerable noise from the engine gears on this engine when it is started up cold. This noise is caused by excess oil on the gears. When the engine is cold, very little oil escapes by the bearings, practically the whole of the oil passes through the overflow, which means, on this engine, it is all fed on to the gears. This we have proved is the cause of the noise. We feel that the scheme on the 40/50 engine as regards the oil pump and relief valve is better than that on the Goshawk. The scheme of the relief oil passing into the suction side of the pump is very practicable and has proved it-self absolutely reliable. We also think, being able to adjust the oil pressure is an advantage. It has enabled us in a great number of cases to overcome complaints which otherwise would have meant spending considerable time and money. We recommend that we, at least, try the Goshawk engine with the oil pump arranged the same as on the 40/50 and with the fixed oil supply to the engine gears. contd:- | ||