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 like overoiling and piston knocks, with statistical data and technical remarks for various models.
| Identifier | ExFiles\Box 47\3\ Scan196 | |
| Date | 30th June 1931 guessed | |
| -9- 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. EXHAUST CUTOUT. June Quarter. C.C. - - - 16 16 } 18 This trouble on Ph.II is caused by the W.P. - - - 2 2 } sliding joint not working, and is definitely cured by modifying the sliding Previous " C.C. - - - 4 4 } 8 joint as per Depot Sheet Hd.{Mr Hayward/Mr Huddy}199. W.P. - - - 4 4 } Additional stay to rear silencer also available. Depot Sheet to be issued. Six months. - - - 26 26 26 ENGINE OVEROILING. June Quarter. C.C. 3 - 8 14 25 } 54 The majority of these are top overoiling W.P. 1 2 5 21 29 } and definitely cured by restricting the oil flow at the valve end of the Previous " C.C. 1 - 3 10 14 } 59 rockers. W.P. 1 - 18 26 45 } See Depot Sheets Hm.{Capt. W. Hallam - Head Repairs}147, 174 and 176. Six months. 6 2 34 71 113 113 ENGINE - PISTON KNOCKS. June Quarter. C.C. - 2 1 3 6 } 6 W.P. - Previous " C.C. - 1 3 8 12 } 13 W.P. - - 1 - 1 } Six months. - 3 5 11 19 19 ENGINE - PISTONS SEIZED. June Quarter. C.C. - - 1 - 1 } 2 W.P. - - 1 - 1 } Previous " C.C. - - 1 - 1 } 1 W.P. - Six months. - - 2 1 3 3 | ||