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).
Knocking issue and bearing clearances on Phantom III rear dampers.
| Identifier | ExFiles\Box 95\4\ scan0086 | |
| Date | 13th March 1937 | |
| 342. To Sg.{Arthur F. Sidgreaves - MD} c. to Da.{Bernard Day - Chassis Design} c. to Hs.{Lord Ernest Hives - Chair} Rm{William Robotham - Chief Engineer}/Les.17/JH.13.3.37. Phantom III Rear Dampers. Re Sg.{Arthur F. Sidgreaves - MD}1/L.11.3.37. The Phantom III rear dampers are identical to the dampers which have been on our other chassis since June 1933. The knocking which developed on all our dampers after over 2 years without a complaint has been due to increased bearing clearance during assembly. Phantom III has been the worst offender due to its position and attachment to a box frame. Cars reaching customers from the beginning of this year have had dampers with good fitting bearings. This bearing fit is likely to remain good owing to the introduction of diamond boring for the bushes. At this early date we have not experienced any complaint due to slack bearings, after diamond boring has been used for the bushes. On 6-B-IV in France we proved that the bearing wear was negligible after 17,000 miles, provided the original bearing fit was good. No knocks developed on 6-B-IV. The Armstrong dampers which are being tested do not require such accurate bearings in order to retain quietness. Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} | ||