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).
Faults with exhaust plugs, manifolds, silencers, and cut-outs for various vehicle models over a six-month period.
| Identifier | ExFiles\Box 47\2\ Scan350 | |
| Date | 1st September 1930 guessed | |
| -6- 20 HP. 25 HP. Ph.I. Ph.II TOTAL REMARKS. EXHAUST PLUGS. September quarter. 25 31 15 1 72 Previous 61 25 22 9 117 Modified washers now fitted 20-25-Ph.I-Alum.Head. Six Months. 86 56 37 10 189 EXHAUST MANIFOLD. (CRACKED OR BROKEN) September quarter. 13 - 8 2 23 Previous quarter. - 1 8 1 10 Depot Sheet Hm.{Capt. W. Hallam - Head Repairs}145 for Ph.I Six months. 13 1 16 3 33 EXHAUST SILENCER CORRODED. September quarter. - - 2 - 2 Previous - - 2 - 2 By.{R.W. Bailey - Chief Engineer} considering this job. Six months. - - 4 - 4 EXHAUST CUT OUT SEIZED. September quarter. - - - 4 4 Previous - - 6 5 11 Six months. - - 6 9 15 | ||