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).
Recent work carried out on Experimental Chassis 11-EX, detailing fixes for oil leaks, starter motor, and electrical faults.
| Identifier | ExFiles\Box 71\3\ scan0102 | |
| Date | 9th February 1926 | |
| (COPY) N.S. CWB. W/H.{Arthur M. Hanbury - Head Complaints} Br1/H.9.2.26. re:- Experimental Chassis 11-EX. We give you below a report of the recent work carried out on the above car:- (1) Oil leaks from oil relay unit. Oil was found to be pouring out fromthe vent holes of the plug E/73208 whenever the engine was running for a lengthy period at high speed. On examination we found that the oil released by the action of the piston E/72509 did not get away fast enough through the return holes into the crankcase, consequently the casing filled right up. It was noticed that these return holes were 3/16" in diameter, whereas on a standard oil relay unit they are 1/4". A new unit was forwarded to us by "W" and this we fitted, returning the defective one to Hs.{Lord Ernest Hives - Chair} at "W" for attention. (2) Failure of starter motor. This was found to be due to the push button contacts being badly adjusted. When the button was fully depressed the carbons were barely touching. The push button was dismantled and the contact bar was set so that the copper brush came into operation after the carbon brushes. The push button was refitted and same was found to be working correctly. The electrical installation was tested out to find the cause for the sudden discharge reading on the ammeter, which disappeared when the switches on the switchbox were moved in any way. All units were disconnected and the whole installation was tested at 240 volts for earth, but same stood up quite satisfactorily. It was found that the nut and washers which held thelug on the end of the series winding on the electrical cutout to the stud, which holds the distribution board to the dash, were missing, and the washer under the lug was pitted, showing that 'arcing' had been taking place. A new nut and washers were supplied and fitted to replace the missing ones. The liquid in thebatteries was found to be low. This was therefore topped up. Bt.{Capt. J. S. Burt - Engineer} | ||