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 condition of the Big-end and Main bearings for vehicle 22.G.V.
| Identifier | ExFiles\Box 101\2\ scan0200 | |
| Date | 30th November 1936 | |
| 25 RUE GIDE LEVALLOIS-PERRET. PARS. FRANCE. GWH{George W. Hancock - Head Chateauroux}/HFH{Hoppy F. Hamilton}/2/JAB. 30th November 1936. To Rm.{William Robotham - Chief Engineer} c. to GWH.{George W. Hancock - Head Chateauroux} 22.G.V. Further to your telegram of the 26th inst., we have examined the Big-end and Main Bearings on 22.G.V. before continuing the running on Mobiloil "Artic". This was done over the week-end at the Paris Depot while waiting for the return of Sr's Bentley which went away for the week-end and which we have not quite completed. The Big-end bearings were found to be in an excellent condition. The bedding in each case extending over the whole bearing surface, with the exception of Nos. 2 and 4 bearings which shewed a bedding more towards the centre, but in no case shewed any sign of disintegration or deterioration. The crankshaft pins were found to be smooth and free from scores. The main bearings were in a poor condition throughout. Nos. 2, 3, 4, 5 & 6 shewed signs that the whitemetal had partially run and a considerable number of loose particles were found on the bearing surfaces. In the case of Nos.4. and 6 intermediate bearings, the metal had run into the oil grooves and formed a restriction. The surfaces of Nos.1 and 7 main bearings although free from loose particles, appeared to have a mottled finish, definitely shewing signs of disintegration. The crankshaft pins were again found to be smooth and free from scores. We have kept a record of each bearing for future reference. We also found a fair quantity of oil sludge in the crankcase filter and a thick layer on the surface of the crankshaft webs. The crankshaft was completely drained of oil and the engine cleaned out as far as possible. We have re-filled with Mobiloil "Artic", and will continue running as soon as we can. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/HFH.{Hoppy F. Hamilton} | ||