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).
Investigation into a stiff gear lever on a 20 HP chassis, considering gearbox oil viscosity.
| Identifier | ExFiles\Box 6\4\ 04-page156 | |
| Date | 25th November 1925 | |
| √5310 EP.{G. Eric Platford - Chief Quality Engineer} C. Hc. Copy BY18/H.{Arthur M. Hanbury - Head Complaints} 25.11.25. 20 HP. CHASSIS. RE VISCOSITY OF OIL IN GEAR BOX. ---------------------------------------------------- Referring to EP{G. Eric Platford - Chief Quality Engineer}13 H.{Arthur M. Hanbury - Head Complaints} 24.11.25. I have made enquiries in the Works and in the Experimental Dept. but cannot find that similar trouble has been experienced. There is no reason why the change gear lever should not move freely endways. One understands of course that with the oil cold you would have to slide it across. With the oil hot, it would almost rattle. This would not constitute the fault which Bales appear to be complaining of. There are no pockets or plungers working into blind ended pockets to restrict the movement of the lever. I am inclined therefore to think that some special feature must be the cause of their trouble. There is a possibility, as follows. - the bush through which the change gear tube slides at its inner end may happen to be made, in that particular chassis, sufficiently slack when the case is hot for the bush itself to slide. This of course should not occur, but if it did occur, I could imagine when the box got cold the bush could not be pushed back freely. This is the only possibility which I can see which would meet the case as you describe it, and this seems to me a very remote contingency, and one which it is difficult to believe has occurred. BY.{R.W. Bailey - Chief Engineer} [Signature] | ||