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 on the engine bearings and pistons of Bentley Chassis B.179.AE.
| Identifier | ExFiles\Box 27a\1\ Scan359 | |
| Date | 4th February 1936 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Derby Copy to HBC. GRY{Shadwell Grylls} see me x 1265 ? x 102D Levallois Sr/VA5/ET.4.2.36 Re: CHASSIS B.179.AE - Mr. F.{Mr Friese} EDMOND BLANC BENTLEY LEAD BRONZE BEARINGS &c... With reference to our memo Sr/VA8/ET.29.I.35 re Bentley lead bronze bearings and the fitting of a set to this car, we have now had an opportunity of dismantling the connecting rods of this car in order to effect an R.20 engine clean, etc.. We examined and measured up the lead bronze bearings and crank pins and found that the bearings had maintained their working clearances. Since we fitted the lead bronze bearings, the car has covered 28.198 Kms. We measured up the crankshaft pins and found them to be Nos. I, 2, 3 and 4 = I.99775" " 5 and 6 = I.9975" The internal diameter of all the lead bronze bearings was found to be 2.0005". MAIN BEARINGS. While carrying out the R.20 engine clean, we decided that, in view of the fact that the car had covered a total mileage of 52.522 Kms, to remove the crankshaft bearing caps and examine the bearing bushes. We found the main bearings to be in a fairly good condition and fit for further service; however, the intermediate bearings, especially two of them, were in a very poor condition and not fit for further service; the four lower halves were cracked and there was a considerable loss of metal from one, plus loss of metal from two others. We then removed the engine from the frame, fitted four new intermediate bearings and reduced the liners of the main bearings. We measured up the main journals of the crankshaft and found them to be: Nos. I, 2, 3, 5 and 6 = 2.247" } Ovalization approximately .0005" N° 4 = 2.246" } CYLINDERS AND PISTONS. After the fitting of the lead bronze bearings on the 24.I.35, the customer informed us that the oil consumption was greater than previously, and instead of improving gradually increased. He did not, however, give us any precise figures as to the amount of oil consumed say per 100 Kms. | ||