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).
Issues with broken bolts on a spare wheel carrier for car 19-EX and wear in the axle control on Peregrine III.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page210 | |
| Date | 10th February 1933 | |
| X4057 G.W.Hancock, c/o Hotel de France, Chateauroux, Indre, FRANCE. To GWH.{George W. Hancock - Head Chateauroux} From Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} Hs{Lord Ernest Hives - Chair}/Les.14/KT.10.2.33. X7941 19-EX SIDE SPARE WHEEL CARRIER SUPPORTS. Thank you for the information with regard to the above and also for the two broken bolts. From examining the bolts it is obvious their life has been very considerably shortened due to the fact that one corner of the bolt has been tightened down on to the radius of the triangular bracket. A hard patch can be seen on the corner of the bolt which exactly corresponds to the line of fracture. We feel that these bolts will be satisfactory if they are were put in with the heads square with the bracket, and thus distributing the load evenly on the bolt head. On production the bolt is kept square by the locking plate F.80848. These are used so that the coachbuilder can remove the spare wheel brackets without the bolts dropping out and getting lost. It would appear therefore, that production is satisfactory. We are sending you some locking plates, rivets, and a new set of bolts, so that you can test the wheel brackets under production conditions. We presume, as 19-EX was fitted with .375" dia. bolts in place of .312" dia. whilst the car was in France, that no locking plates are fitted. E.{Mr Elliott - Chief Engineer} would like you to fit these as soon as you can conveniently. As we do not like the appearance of the brackets between the outside of the frame and the dash, we are taking the opportunity of trying to improve the whole scheme. WEAR IN AXLE CONTROL ON PEREGRINE III. As we have bumped the small dia. ball in the axle control, and noticed no sign of wear after 150 hrs, we feel there is some silly difference between the bumper and your cars. We do not think the braking could account for this. Once or twice we have heard knocks from the axle control on the bumper, which we imagined was caused from the front ball pad sticking from a piece of grit, and the ball hammering against the rear ball pad over the .010" clearance. | ||