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).
Bar chart tracking various engine faults and their causes over a six-month period in 1939.
| Identifier | ExFiles\Box 131\3\ scan0079 | |
| Date | 1st June 1939 guessed | |
| 1939 JAN FEB MARCH APRIL MAY JUNE ENGINE THROTTLE STICKING DUE TO RETURN SPRING STRETCHING DISTORTION OF THROTTLE BODY GUMMINESS A - NEW SPRINGS B - LUBRICATED C - DISTORTED MODIFIED SPRING ANCHORAGE AND NEW SPRING IS BEING FITTED Data Points: Jan: 17 total cases (13 'A', plus 'B' and 'C') Feb: W301 Mar: W328 NOISY VALVE GEAR DUE TO WORN TAPPETS, ROLLERS AND PINS 21,000 MILES. APRIL 28907 MILES Data Points: Mar: 6 cases HEAVY OIL CONSUMPTION A B - LOSS OF OIL PRESSURE WHEN CORNERING SECTION RING FITTED Data Points: Feb: K, P169, P181, P159, W316 Mar: 7 cases, B, A, W316, W320 Apr: A, K, P199, P200, W336 POOR PERFORMANCE IRREGULAR SLOW RUNNING VALVE SEATS DISTORTED M.R. SERIES Data Points: Feb: W301 Mar: 4 cases, K, P189 EXHAUST MANIFOLD STUDS BROKEN. CRACKED MANIFOLD GWM 3 | ||