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).
Engine faults, including piston knocks, seized pistons, and drive rattles, across various car models with remarks on cures.
| Identifier | ExFiles\Box 47\3\ Scan069 | |
| Date | 31th March 1931 guessed | |
| -9- 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. ENGINE - PISTON KNOCKS. March Quarter. C.C. - 1 3 8 12 } 13 We have had only three cases of Ph.II W.P. - - 1 - 1 } knocks at W. and these were hyper- critical owners. Previous " - - 4 4 4 Six months. - 1 4 12 17 17 ENGINE - PISTONS SEIZED. March Quarter. C.C. - - 1 - 1 } 1 W.P. - - - - - } Previous " - - - - - Six months. - - 1 - 1 1 ENGINE - SLIPPER & SPRING DRIVE. March Quarter. C.C. 35 4 9 9 57 } 65 Early 20 HP. & PH.I. These can be cured W.P. 3 2 1 2 8 } by fitting cotton duck washers in place of bakelite. Previous " 10 7 11 19 47 47 20/25 HP. We do not have much trouble on these cars. Six months. 48 13 21 30 112 112 PH.II Latest type low inertia drive with "window" type pressure plates cures this trouble. See Depot Sheet Hd.{Mr Hayward/Mr Huddy}180. ENGINE - DYNAMO DRIVE RATTLES. March Quarter. C.C. 8 1 1 - 10 } 10 This has always been a trouble on 20 HP W.P. - - - - - } cars. No modification available. Previous " 3 1 - - 4 4 Six months. 11 2 1 - 14 14 | ||