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, subsequent repairs, and the results of a post-repair test.
| Identifier | ExFiles\Box 47\1\ Scan161 | |
| Date | 16th October 1925 guessed | |
| -2- g.{Mr Griffiths - Chief Accountant / Mr Gnapp} Slipper drive examined, and resistance equal to 28 lbs. at the end of a lever 17" long. Surfaces found on the rough side. h.{Arthur M. Hanbury - Head Complaints} Fan blades slightly bent & fan belt noisy, (noted on test). i. Radiator tested and found to be free of obstructions. j.{Mr Johnson W.M.} Engine dampers were very lightly set. Repairs effected. a.{Mr Adams} Capacity of combustion space reduced to an average of 395 cc. by fitting H/C pistons & comp. plates under cylinders, 3/32" thick to front group, 1/16" to rear group. This difference in thicknesses was necessary to equalize compressions of front & rear groups. b. Care taken to undercut Insertion washers to prevent overlapping of orifices. c. Freed butterfly valve & backed off periphery in the neighbourhood of axis to prevent further trouble. d.{John DeLooze - Company Secretary} Carburation enriched. e.{Mr Elliott - Chief Engineer} Left valve timing as set. Re-set ignition on early side. f.{Mr Friese} Thermostatic valve put back without modification. g.{Mr Griffiths - Chief Accountant / Mr Gnapp} Lapped in slipper drive surfaces with oildag. Backed off edges of bakerlite discs. Resistance equal to 15 lbs. at end of 17" lever. h.{Arthur M. Hanbury - Head Complaints} Fan blades trued up, and new whittle fan belt fitted. i. Radiator refitted. O.K. as taken down. j.{Mr Johnson W.M.} Engine dampers were set on road, and friction slightly increased. g.{Mr Griffiths - Chief Accountant / Mr Gnapp} h.{Arthur M. Hanbury - Head Complaints} & j.{Mr Johnson W.M.} effect vibration in engine. First test after repairs. Atmospheric temperature. 18°C. Bellevue test hill. Temp. of water in radiator at bottom. 75.°C. Car succeeded in climbing on top gear. | ||