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).
Wear and performance of various vehicle components after 5,000 miles.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan214 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: GWH{George W. Hancock - Head Chateauroux}1/Crnl.9.25 No slipping has occurred. There has been a slight squeak occasionally from the clutch trunnion. Gearbox. There are slight leaks of oil from housing covers. A slight leak of oil also from speedometer drive housing, and at flange where servo brake levers are anchored to gearbox. At 5,000 miles, no oil was required in the gearbox. We have had no occasion of any gears tending to jump out of mesh. Gear change mechanism. This is quite O.K. Servo and servo gears. The servo jaggers when cold, when the brake is applied suddenly. These die out as the box warms up. It has not been necessary to adjust the servo, during the continuation of run. A fair amount of wear has developed in connecting links, and pins between brake pedal and brake equalising shaft. The amount of this wear is shewn by a loss of 0.250" movement on brake pedal, before same operates cams of servo. Servo gear rattles have not become more pronounced during continuation of test. These vary in amplitude according to load put upon car when accelerating. Also, they are more pronounced after box has warmed up. The damped arm on servo linkage has operated O.K. We have had no occasion of thumping on front brakes during continuation of test. Pedals 'D' type to L.O.P. F:53E06. Considerable wear has developed in clutch pedal bearing. Slight wear has also developed in foot brake pedal bearing. Accelerator pedal is O.K. Starter motor. As reported in our 2,500 miles report, we dismantled the Bendix drive, and thoroughly cleaned same. After re-fitting this up, it has functioned on first application of switch. Condition of starter motor is O.K. There is still a leak of oil from rear cover of Bendix pinion housing. This oil, as previously reported, is flung by the flywheel into the pocket of the starter motor sprocket which, when hot, leaks through flange. Rear axle. This has remained good, and is free from oil leaks. Rear brake mechanism and drums. These have not been dismantled since our previous report. Rear brakes have functioned O.K. Brake mechanism has remained in good condition. contd:- | ||