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).
Brake drum balance, clutch plate replacement, and trunnion operating shaft issues.
| Identifier | ExFiles\Box 91\3\ scan0014 | |
| Date | 12th June 1936 | |
| Handwritten Annotations: Top Left: LE Smith Top Left: See By about these failures & let me know what is being done Top Left: To. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Top Left: - Abt Dec 1935 - Top Left: G84068 Top Left: G85783 Top Center: X300 a Top Right: GWH{George W. Hancock - Head Chateauroux}/HFH{Hoppy F. Hamilton}/JAB. Top Right Signature: Rm{William Robotham - Chief Engineer} Typed Content: HOTEL DE FRANCE. CHATEAUROUX. Indre. France. 12th June 1936 32. EX. We have found that the O.S. front brake drum to be out of balance to the extent of 1.15 ozs. We have therefore, drilled 5/16" holes through the cooling flange on the heavy side and put a 1/4" bolt through the flange on the light side. This has balanced the drum and is satisfactory. We have to-day received the new clutch plate and packing ring, together with a new set of adjusting screws. These screws however, still have hexagon key holes; your memo states they should have screw driver slots in order to replace the existing ones which have holes. It is essential that the cover bolts should be surclipped as has been previously done, so that they cannot move back when the half flywheel & pressure plate is being replaced. This has caused us considerable difficulty, and it would save the Service Depots a good deal of time if this was done. When the clutch was dismantled, examination was made for oil leak from the rear engine bearing. There was no sign of oil on any part of the clutch or case. It was remarkably dry. The trunnion operating shaft was found to be stiff, and on inspection, we found that the needle bearings had worn grooves for themselves. It appears that the shaft and outer bearing casings are not hard enough. This trouble is a reoccurrence of the same trouble as we have had on the bearings of the rear brake actuating levers, during the last 10.000 miles test. Before fitting up the new clutch plate sent out, we had to free the back part of the splines, this is now entirely free, and should not be affected by expansion. We have examined the pressure plate lugs and find them to be free in their guides there being a clearance of .0025" each side. We note your remarks as to the oil holes on the operating sleeve guide, and have therefore left these untouched. Signed: H.{Arthur M. Hanbury - Head Complaints} Hamilton Initials: HFH{Hoppy F. Hamilton} Typed Initials: GWH{George W. Hancock - Head Chateauroux}/HFH.{Hoppy F. Hamilton} | ||