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).
Responding to an owner's complaint report regarding engine knock, bearing clearance, and shims.
| Identifier | ExFiles\Box 100\3\ scan0170 | |
| Date | 16th October 1937 | |
| To Rm.{William Robotham - Chief Engineer} GWH{George W. Hancock - Head Chateauroux} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}18/JH.16.10.37. Owners Complaint Report. Report No.W.51. I can assure you that the Depots are not blaming the bearings for every noise in the engine, as a matter of fact they do everything before taking an engine down for knock. The small amount of slack reported in the report No.W.51 is probably misleading. I take it that they mean the shims had to be sunk .002" and .003". This would very likely mean that a total bearing clearance would be in the region of .011 and would cause a knock. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||