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 questions about Bentley bearings.
| Identifier | ExFiles\Box 115\3\ scan0322 | |
| Date | 13th December 1938 | |
| 1020 To Rm.{William Robotham - Chief Engineer}.. from Mx.{John H Maddocks - Chief Proving Officer} Mx.{John H Maddocks - Chief Proving Officer}3/N.13.12.38. BENTLEY BEARINGS. Replying to Rm{William Robotham - Chief Engineer}2/R.12.12.38. Questions 1 and 2. There have been no recorded instances of sinkage or complaint of bearing slackness or 'thump' on cars fitted with AC.7. main bearings in conjunction with W.M. rear bearing. This statement is based on 15 months experience of new cars and cars attended to by Service Depots which have had full Mod.C. applied. Questions 3 and 4. Except for one case where K.{Mr Kilner} had obviously not done the job properly, and GWH.{George W. Hancock - Head Chateauroux} agrees, there have not been any recurrent cases of complaint at any of the three main Depots after Mod.C. has been applied. There have been recurrent complaints on 17 cars which had Mod.B. only. This modification has now been discontinued except for "Mild cases" where lift in shaft is not more than .004, at the same time bearing in mind the type of driver and conditions of use. Question 5. Considerable improvement has been effected since the adoption of (1) Forcing bearing shells into housings to ensure bedding of the back of shells, (2) Giving a total nip of .002. GWH.{George W. Hancock - Head Chateauroux} advocates still more nip, and has discussed this with BY.{R.W. Bailey - Chief Engineer} Mx.{John H Maddocks - Chief Proving Officer} | ||