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).
The investigation of faults with joints and the testing of the gearbox and vacuum pump.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan129 | |
| Date | 1st February 1929 guessed | |
| contd :- -2- of oil in it. We also had a similar case with the chassis on the road. On investigation of these joints we found one definite fault, i.e., the eyelet of the joint distorts when the nuts are tightened up, and tightens up on the pinton. We allow .002 to .003" draw to ensure an oil-tight joint. In comparison with the American Mechanics joint our eyelets are very light. The sections on the American joint have been designed to overcome this fault. The same thing occurs on the 20 HP. joint. We have added more metal to the eyelets and by doing this we find the fault can be avoided. We have also had trouble with the joints knocking owing to end clearance. We have received a modified scheme - as attached - to overcome this. We find on the road that if there is any tightness in the universal joints it shows up as a vibration throughout the whole car. Gearbox. We have run for 1/2 hr. maximum torque on the 1st. gear and 1 hr. each on the 2nd. and 3rd. gears. The condition of the gearbox is very good. The only trouble experienced was oil leaks from some of the joints. This has been attended to. The vacuum pump, during the tests, supplied an ample quantity of petrol and is a big advantage over the induction depression system. The minimum petrol consumption at 1500 r.p.m. was the same pts/hr. as on the present Phantom. ##.CONTD:- | ||