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).
The inspection of chassis B.35.KU, a Paris Trials Car, detailing crankshaft and bearing measurements.
| Identifier | ExFiles\Box 146\1\ scan0103 | |
| Date | 16th November 1937 | |
| To Bentley Motors Ltd. Derby........... Rm.{William Robotham - Chief Engineer} Handwritten: Talee 1245 Handwritten: SWOZ. Levallois Re: CHASSIS B.35.KU - PARIS TRIALS CAR (Sr/VA9/ET.15.II.37) Sr. has asked me to send you a full report concerning the cause of the excessive oil flow from the main bearings etc.. He has also asked me to mention to you that he decided that the engine should be removed from the chassis because we are going to fit a latest type 10" clutch plate and therefore, in view of the clutch having to be dismantled, it would not be a very long job to remove the engine. We should also mention that our ramp was needed for other cars and that at the same time as attending to the engine, we are removing the aluminium brake drums from chassis B.8LGA and fitting them to the above car. We have now removed the crankshaft from the engine and the following is our report: Crankshaft: 1 2 3 4 5 6 7 Main journals 2.248" 2.247" 2.247" 2.247" 2.247" 2.247" 2.2475" 2.246 2.246 2.2455 2.246 2.2455 2.245 2.247 Ovality .002 .001 .0015 .001 .0015 .002 .0005 Crankpins 1.99825 1.9985 1.99825 1.99825 1.99825 1.99825 Internal dia- meter of main bearings 'A' 2.251" 2.251 2.251 2.2525 2.251 2.251 2.249 'B' 2.250 2.250 2.251 2.2505 2.250 2.2505 2.249 The main journals of the crankshaft are rather badly scored, especially Nos. 4, 6 and 7. All the main bearings were found to have "closed in" near the joint faces .007" to .008" on either side (.014" to .016" on diameter). We have opened out the bearings and refitted them to their respective housings. We could not detect any sign of sinkage. No2 big end shows signs of having overheated and No3 has definitely overheated. We found that all the nuts of the main bearing bolts could be tightened up from 1/4 to 1/2 a turn. Watermark: PERFECTUM SUPERFINE | ||