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).
Condition report on the crankshaft and bearings for chassis B.64.KT, detailing measurements due to an engine knock.
| Identifier | ExFiles\Box 146\1\ scan0302 | |
| Date | 4th July 1938 | |
| To Bentley Motors Ltd. Derby.............Rm.{William Robotham - Chief Engineer} Copy to BY.{R.W. Bailey - Chief Engineer} " " RHC.{R. H. Coverley - Production Engineer} Allee 1245 Levallois Sr/VAI3/GM.4.7.38 re: CHASSIS B.64.KT - Mr. FAYE Total mileage as per speedometer 19.904 Kms. = 12.437 Miles. The above customer has sent his car to us for attention to a knock and vibration in the engine. Upon testing the car, we observed that the knock occured when the engine was running at 3.500 R.P.M. The following is our report upon the condition of the crankshaft and the bearings : CRANKSHAFT 1 2 3 4 5 6 7 Max. diameter( main journals) (MIN: DIA:) 2"2465/.245 2"247/.245 2"247/.245 2"246/.245 2"247/.245 2"2475/.2455 2"2485/.2465 ovality ( .0015 .002 .002 .001 .002 .002 .002 Diameter of ( the crankpins) 1"9985 1"9985 1"9985 1"9985 1"9985 1"9985 x Bow at centre .006" MAIN BEARINGS: sinkage in upper half (IN CAPS) { .0015/.003 .001"/.004 .002/.003 .0025/.0035 .0015/.0035 .001/.002 .0035/.005 Average sinkage of big-end bearings { .001 .001 .008 .006 .008 .001 x The main journals of the crankshaft are very badly scored which vary in depth about .001" to .0015". No. 3, 4 & 5 big-end bearings are deformed due to them having been very hot. ..... | ||