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 report on hydraulic system faults for various models over a six-month period.
| Identifier | ExFiles\Box 130\4\ scan0148 | |
| Date | 31th March 1937 guessed | |
| - 6 - 25 HP. 30 HP. PH.II. PH.III. TOTAL. GRAND TOTAL. REMARKS. HYDRAULIC KNOCKS. March Quarter. C.C. 21 2 12 5 40) C.P. 5 - 2 1 8) 48 Some of these knocks are from damper connection or loose bolts. Remainder are internal knocks from pistons and bearing pads or main bushes. Better fitting bushes are being used on Production. Previous Quarter. C.C. 14 1 11 - 26) C.P. 3 1 2 - 6) 32 Six Months. 43 4 27 6 80 80 HYDRAULIC LEAKS. March Quarter. C.C. 1 1 1 1 4) C.P. - - - - -) 4 Previous Quarter. C.C. 5 - 2 3 10) C.P. - - - - -) 10 Six Months. 6 1 3 4 14 14 HYDRAULICS LOOSE ON FRAME. March Quarter. C.C. 4 - 6 - 10) C.P. 3 - - - 3) 13 Larger diameter bolts are now being fitted on Production to overcome this complaint. Previous Quarter. C.C. 7 - 4 1 12) C.P. 1 - 1 - 2) 14 Six Months. 15 - 11 1 27 27 HYDRAULICS - FAILURE OF CONTROL. March Quarter. C.C. 11 5 5 3 24) C.P. 7 3 2 - 12) 36 These are rectified by cleansing the system generally and curing minor oil leaks, or lapping in valves of control pumps. Previous Quarter. C.C. 5 2 6 1 14) C.P. 2 - - - 2) 16 Six Months. 25 10 13 4 52 52 | ||