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).
Page 2 detailing engine component failures and observations.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan210 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -2- Expl. No. REF: CMH/Gml.9.25. EXPERIMENTAL REPORT. and 18 to 23 m.ph. On the retard we reported one from 44 to 41 m.p.h. but as this is a period of servo gears, we would not definitely say that it is coming from the engine, as this period of servo gears has increased slightly during the run, and was probably from that cause when we first reported it. Engine gears. These were good up to the time of cam wheel becoming damaged through nut breaking away from slipper wheel, and jamming in gears and of cam wheel. Since fitting new cam wheel, gears are noisy and uneven. Engine case. There is an oil leak at rear of engine between flywheel and case. There is also a slight oil leak at joint of valve cover casing. In hot weather there is also slight leak of oil from tappet adjustment covers. Slipper drive. Two bolts failed on this at 2,807 miles, the bolts breaking off short at face of front half of slipper wheel. These were despatched to Derby for examination. The failure of these bolts caused damage to cam wheel, but did not put the car out of action. Examination of other gears did not shew any damage. New bolts were supplied from Derby, and fitted (complete set). Slipper wheel has functioned O.K. after refitting up. Water pump & drive to L.O.P. E.50308 and 52010. Water pump functioned satisfactorily during test, and drive is in a good condition. Inlet pipe to L.O.P. E.51767. This has remained in good condition. This has been replaced by new one through exhaust box cracking, as this is more or less in one unit, the hot spot device bolts holding same being riveted over. Exhaust pipe and fittings to L.O.P. E.51605. Locking device on exhaust pipe to Sch.569. The exhaust box was found cracked right round approx. 1½" from Nos.5 and 6 port. This, we think, had become cracked in the first place in taking off pipe twice to replace washer on Nos. 3 and 4 port, which had blown out. The pipe, having warped, caused it to jam on the two centre studs, which made it difficult to remove. We would recommend that more clearance be given for the two centre studs which locate the pipe. contd :- | ||