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 stronger front engine support studs for the Phantom 111.
| Identifier | ExFiles\Box 91\1\ scan0545 | |
| Date | 10th October 1938 | |
| 360 c. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} c. BY/Ald.{F. Allwood - Experimental Design} DA.{Bernard Day - Chassis Design}18/G.10.10.38. PHANTOM 111 - STRONGER FRONT ENGINE SUPPORT STUDS. Please receive herewith :- E.CD.930 Stronger Studs for Front Engine Support Brackets. Phantom 111. The reason for this alteration is that failure has occurred on three cars of the studs fixing the front engine support bracket to the crankcase as reported by Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} Although the present studs of .3125" diameter appear to be adequate for their job from a stress point of view we have increased the diameter to .375" and also deleted the counterbored portion of stud holes in the crankcase. To enable the nuts for these studs to be spannered, we are compelled to call for non-standard nuts, also to avoid altering the bracket pressing and crankcase casting we have asked for a non-standard plain washer to be fitted beneath the spring washer which replaces the original tab washer. A modified retaining plate is shown for the torque reaction damper bolts, which can now be rivetted to bracket prior to attaching bracket to crankcase, the bolt heads, however, have had to be reduced in depth by .025 to clear box spanner for bracket nuts, the alternative to this is to use a special reduced diameter box spanner to clear standard bolt heads. Our opinion is, that the failure of these studs is due to their nuts not being sufficiently tight or that the lock washer tabs have not been properly bent up to lock the nuts, and for this reason we have changed to spring washers for looking the nuts. Will you please detail and instruct the parts for this experiment, so that they can be tried with a view to introducing them for production at Series. E.{Mr Elliott - Chief Engineer} Will BY/Ald.{F. Allwood - Experimental Design} please note the reasons for the use of non-standard parts. DA.{Bernard Day - Chassis Design} | ||