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).
Inspection report detailing the condition of engine parts and conclusions after a development run.
| Identifier | ExFiles\Box 123\5\ scan0345 | |
| Date | 25th February 1939 | |
| -5- Hm{Capt. W. Hallam - Head Repairs}/Swdl.{Len H. Swindell}3/MH.{M. Huckerby}25.2.39. Inspection of Parts - Cont'd.{John DeLooze - Company Secretary} Fitted with 3 exhaust valve inserts (Brico) and 3 seats cut direct in the cylinder block, the condition of them are almost identical and excellent, and what little valve sinkage there is can be regarded as negligible, likewise the sodium filled valves are also in good condition. Up to the present time we have not had an opportunity of inspecting the cylinder head as this being the only "best condition" head, is fitted on 29.G.VI; however, a casual inspection revealed nothing out-standingly wrong. The bottom tappets, which are of the latest strengthened type, are generally in good condition without any cracks: there are, however, several minute particles arising on the bottom faces of the tappets. We are of the opinion that this is the result of continuous high loading which pounds out any relatively loose particles in the construction of the cast iron material. The cylinder head gasket which is of Klingerit "1000" material .030 thick, shows slight signs of burning, but otherwise is excellent. Originally we had a cast Monichrome camshaft which gave trouble in respect of tooth wear on the distributor drive, which now appears to be completely cured by the S/ZN camshaft as run in this unit, the cam profiles, petrol pump eccentric and gear being in good condition. The whitemetal surface of the Vandervell rocker bushes appears to be breaking up slightly in several cases. However, we will continue running to see whether they get appreciably worse. Conclusions. Considering that the unit was not prepared for the endurance after running 140 hours development, the result of the 50 hour endurance run is generally satisfactory as no major items have failed. Regarding the failure of the camwheel it is expected that failing a satisfactory harmonic damper, this trouble will be cured by fitting a spring drive. The remaining failures can be regarded as a matter for normal development to overcome. Hm{Capt. W. Hallam - Head Repairs}/Swdl.{Len H. Swindell} | ||