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).
Preliminary test report detailing part failures and modifications at various mileages up to 15,080 miles.
| Identifier | ExFiles\Box 97\5\ scan0140 | |
| Date | 22th March 1939 | |
| -E- Briefly, if the second half of the test had been stopped at 25,000 miles, 10,000 more than we usually run, no major failure would have been recorded. A brake drum was cracked during this test at 15,000 miles. This has happened on various previous 15,000 miles cars when extra heavy braking has been indulged in. The main bearings, which were strip type, showed signs of distress at the end of the run, but would have lasted a further 10,000 miles at least. PRELIMINARY TEST OF 15,000 MILES. Mileage. Part & Failure. Modification. 4,000 Rear spring Material altered to S/N. Centre Bolt 6,000 Front Damper Design Mod. Replenishing Valves Second run O.K. 9,000 Rear Damper Connecting Revert to Silentbloc Link Rubbers. Second run O.K. 10,000 Hand brake ratchet Receiving attention guard dented with stones. 11,242 Rear Prop. Shaft Joint Bigger Joint fails. Second run O.K. 11,500 Front damper piston Valve mods rectify. link fails due to (Z) Second run O.K. 13,000 Piston Abnormal Second run O.K. 14,000 Dynamo Brush material being modified. 15,000 Gearbox Layshaft Bearings Needle bearings replaced by rollers. 15,080 Petrol Tank Vent Rubbers Neoprene tried. | ||