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).
Technical report on the inspection, testing, and repairs of a rear axle assembly.
| Identifier | ExFiles\Box 97\4\ scan0151 | |
| Date | 21th November 1938 | |
| - 3 - Rear Axle - continued. The axle pinion GB.3487 and coupling flange GB.4005 are badly scored on the taper section. The coupling flange was removed in France and when refitting the pinion nut was not tightened sufficiently, permitting the flange to move on the taper. Any results? (handwritten) The nose bearing bridge GB.3679 is .006 out of alignment with the bore of the centre casing. It is possible that this is due to the car having been lifted with the jack under the axle, or alternatively by riveting over the bridge securing bolts. This has been pointed out to Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} who has issued instructions for an investigation to be made. The initial preload in the bearings of the pinion assembly PD.91 has been lost due to wear caused by the outer bearing ring revolving in the pinion housing. The various components were measured before and after test, the dimensions being as follows :- Before Test. After Test. GB.3664 Thrust Bearing .7290 .7285 GB.3664 Journal Bearing .7285 .7280 GB.3665 Roller Bearing .8260 .8260 GB.3663 Thrust Washer .1010 .1005 GB.3677 Retaining Nut .5480 .5470 GB.3676 Housing 2.4520 2.4525 Amount of Wear - .003. Preload on Assembly - .002. The spring plates GB.3980 were originally compressed .116 by means of an adjusting washer to give 1000 lbs. preload on the A/C. bearings. After test the plates gave 1000 lbs. preload when compressed .091. Replacements have now been fitted to give the correct poundage and compression. Oil leakage has occurred between the flange of the spring suspension bracket and the brake carrier plate and also from the oil catcher GB.3729 fitted to the axle shaft. New oil catchers produced to Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}'s instructions have been fitted as replacements. The axle shafts GB.4020/1 have been tested for cracks and axial twist and found satisfactory. continued. | ||