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).
Alteration to the Wraith III and Bentley 111 crankshafts to prevent damage during assembly by reducing the rear bearing length.
| Identifier | ExFiles\Box 132\1\ scan0027 | |
| Date | 5th January 1938 | |
| 1116. PY/HS.{Lord Ernest Hives - Chair} c. Rm.{William Robotham - Chief Engineer} c. HFS/RH.{R. Hollingworth} DA.{Bernard Day - Chassis Design}8/G.5.1.38. Hiles SWDC WRAITH 111 and BENTLEY 111. CRANKSHAFTS. A point raised by the Experimental Department referring to the risk of damaging the thrust face of the rear crankshaft journal bearing when assembling, due to the balance weight on number 12 web overlapping the thrust face on crankshaft by .0065, should be overcome by reducing the overall length of the rear bearing by .025 making the length of the bearing 2.100 instead of 2.125, a reduction in bearing length of just over 1%. This alteration should apply to any further crankshafts made so as to avoid this risk in the future. For the crankshafts already made, care must be taken when assembling bearings to see that the rear balance weight is in a position above the joint face of the crankcase. The alteration will also apply to the experimental crankshaft to E.CD.238, the only alteration required on this, is to reduce the length of the rear bearing on the forward part by .0125 making dimension from centre line to forward face 1.050 instead of 1.0625. DA.{Bernard Day - Chassis Design} | ||