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 difficulties encountered when fitting a connecting rod due to machining inaccuracies causing bearing distortion.
| Identifier | ExFiles\Box 83\1\ scan0328 | |
| Date | 10th January 1937 | |
| HOTEL DE FRANCE, CHATEAUROUX. Indre. France. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/2/JAB. 10th January 1937 To. Rm.{William Robotham - Chief Engineer} 6. B. IV. 6.B.IV. We have received the connecting rod for this has been fitted, but considerable time was taken owing to some inaccuracies in the machining of same. When we tried to fit the rod with cap removed, the bearing was tight at the split and would not go on the pin. Upon taking the metal bearing out of the con-rod housing and trying it alone on the pin, we found it was free and a normal fit. It had to be sprung into the housing of the con-rod which closed the bearing in. We spent some considerable time easing it off to lessen the springing effect and eventually got it so that it fitted in the housing, it would go on the crank pin. The cap portion fitted with no trouble. Upon fitting the con-rod with cap in position and screwing the nuts up just chock, the bearing was tight on the pin but as the two nuts were tightened up, the bearing became free and upon finally tightening up, the bearing was perfectly free. This means that in tightening up, a distortion of the housing of the rod took place spreading the housing outwards. This would appear to be due to the two bolts not being square with the face of the housing. 6.B.IV. has gone out for a run in to-day, afterwards, the head will be further tightened down and tappet clearance checked over. ----------- G.W.Hancock. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||