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).
Examination report on the crankshaft and main bearings of an engine for reconditioning purposes.
| Identifier | ExFiles\Box 146\1\ scan0047 | |
| Date | 20th October 1937 | |
| To SR... London Copy to .. Rm{William Robotham - Chief Engineer} " " .. Hd{Mr Hayward/Mr Huddy} Levallois VA1/AD/20.10.37. Re: CHASSIS B-60-GA - Ex. Paris Trials Car Mileage 67.180 Kms We have dismantled the engine of this car for examination of the bearings, etc., for reconditioning purposes. The following is a report upon the crankshaft and the bearings: CRANKSHAFT Bow in centre - .010" Wear and ovality 1 2 3 4 5 6 7 of main journals( 2"247 2"2475 2"247 2"247 2"2465 2"247 B"2475 245 245 245 245 245 245 247 Ovality : .002 .0025 .002 .002 .0015 .002 .0005 Nos 1.2.3.4.5. and 6 Main Journals are badly scored. No. 7 is in a much better condition than the remainder. Sinkage of Main Bearings into crankcase ( .002 .004 .002 .004 .002 .002 .000 into caps ( .002 .006 .002 .002 .002 .002 .000 Dia. of crankpins 1"998 1"998 1"9985 1"998 1"9985 1"998 Internal dia. of big ends 2"001 2"003 2"001 2"002 2"001 2"001 MAIN BEARINGS - In order to carry out a 10.000 miles test of standard white metal bearings on a 4 1/4 litre chassis we, at the request of Rm{William Robotham - Chief Engineer}, fitted a set of white metal Main Bearings to this engine on the 16th October 1936. The car, then, had covered 23.065 Kms. A full report was sent to Rm{William Robotham - Chief Engineer}, as per our VA5/ET/31.12.36, after the completion of the test. We removed the white metal Main Bearings with the exception of No 7 (rear) bearing which was in an OK condition, and fitted a set of standard Halls metal Main Bearings. 1°- The existing Halls metal Main Bearings Nos. 1.2.3.4. 5 and 6 have covered a mileage of 28.070 Kms. 2°- The existing No 7 rear white metal bearing has covered a mileage of 44.115 Kms, and the surface of the bearing is in an OK condition and free from cracks with the exception of a suspicion of a slight crack in the upper half. | ||