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).
Summary table of engine faults by model, detailing incident counts and providing remedies.
| Identifier | ExFiles\Box 47\3\ Scan337 | |
| Date | 1st December 1931 guessed | |
| -9- ENGINE - PISTON KNOCKS. 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. December Quarter. C.C. - - 9 7 16 ) 18 W.P. 2 - - 2 2 ) Previous " C.C. 1 1 4 7 13 ) 15 W.P. - - 2 - 2 ) Six months. 3 1 15 14 33 33 ENGINE - PISTONS SEIZED. December Quarter. C.C. - - 1 - 1 } 1 W.P. - - - - - } Previous " C.C. 1 - - - 1 } 1 W.P. - - - - - } Six months. 1 - 1 - 2 2 ENGINE - SLIPPER & SPRING DRIVES. December Quarter. C.C. 9 7 4 9 29 ) 31 W.P. - - - 2 2 ) Previous " C.C. 12 6 5 13 36 ) 38 W.P. - - 2 - 2 ) Six months. 21 13 11 24 69 69 ENGINE - DYNAMO DRIVE. RATTLES. December Quarter. C.C. 4 1 1 - 6 } 6 W.P. - - - - - } Previous " C.C. 3 - - - 3 } 4 W.P. - 1 - - 1 } Six months. 7 2 1 - 10 10 REMARKS (column): [For SLIPPER & SPRING DRIVES] Early 20 HP. & PH.I. These can be cured by fitting cotton duck washers in place of Bakelite. 20/25 HP. We do not have much trouble on these cars. Ph.II. Latest type low inertia drive with "Window" type pressure plates cures this trouble. See Depot Sheet Hd.{Mr Hayward/Mr Huddy}190 and Hd.{Mr Hayward/Mr Huddy}227. [For DYNAMO DRIVE. RATTLES] This has always been a trouble on 20 HP. cars. No modification available. | ||