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).
Final test report from 15,000 to 50,000 miles, detailing part failures and modifications.
| Identifier | ExFiles\Box 97\5\ scan0141 | |
| Date | 22th March 1939 | |
| -3- FINAL TEST. 15,000 - 50,000 MILES. Total Mileage run by part. Part and Failure. Modification made to overcome trouble. 588 ) 2,869 ) 3,139 ) Valve Springs broken. No explanation No further failures in last 20,000 miles. 29,000 Rear Spring leaves fail Stress can be reduced by increasing number of plates. 30,000 Exhaust Valve head fails. Stem thickness being increased. Standard Wraith valve. 35,000 Clutch plate Driving springs Standard failures do not occur in service. 40,000 Rear axle wheel bearings fail. Bearings increased 25% in capacity. Failure probably due to being fitted with too little clearance. A number of minor troubles such as thermostats sticking, mis-firing on the pick-up, etc. occurred. These are being dealt with. Rm.{William Robotham - Chief Engineer} | ||