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).
Statistical report on vehicle faults and complaints for different models over quarterly periods.
| Identifier | ExFiles\Box 47\3\ Scan071 | |
| Date | 31th March 1931 guessed | |
| -11- 20 HP. 25 HP. PH.I. PH.II TO L. GRAND TOTAL. REMARKS. ENGINE - OIL PRESSURE FAILS. March quarter C.C. 1 - - 1 2 } 2 W.P. - - - - - } Previous " 2 - - 4 6 6 Six months. 3 - - 5 8 8 On 20 HP. this is due to oil surging in the crankcase when braking, and is cured by fitting a baffle to the oil sump. WATER LEAK FROM CYLINDER. March quarter C.C. 1 - 4 2 8 } 11 W.P. - 1 2 - 3 } Previous " - - 6 - 6 6 Six months. 1 1 11 4 17 17 Ph.I. and Ph.II definitely cured by fitting nickel plated copper tubes in place of the original aluminium ones. TOTAL HYDRAULIC COMPLAINTS. March quarter C.C. 32 41 25 39 137 } 147 W.P. 1 1 2 6 10 } Previous " 30 22 17 66 135 135 Six months. 63 64 44 111 282 282 HYDRAULIC KNOCKS. March quarter C.C. 32 40 24 35 131 } 139 W.P. 1 1 2 4 8 } Previous " 29 22 17 57 125 125 Six months. 62 63 43 96 264 264 This matter is in the hands of the Experimental Dept. for further investigation. Depot Sheet No.105 deals with the treatment of knocks on existing dampers. HYDRAULIC LEAKS. March quarter C.C. - 1 - 3 4 } 5 W.P. - - - 1 1 } Previous " 1 - - 4 5 5 Six months. 1 1 - 8 10 10 | ||