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).
The condition of engine 18.G.IV after a 10,000 miles test.
| Identifier | ExFiles\Box 5a\3\ 03-page201 | |
| Date | 8th January 1932 | |
| To B. from He/GM. C. Sg.{Arthur F. Sidgreaves - MD} Vor. C. Da.{Bernard Day - Chassis Design} La.{L. A. Archer} C. Hy.{Tom Haldenby - Plant Engineer} PN.{Mr Northey} STRIP OF 18.G.IV. AFTER 10,000 MILES TEST. Engine. The engine generally was in a very good condition. The bearings are the best that have been seen after a 10,000 miles test. The wear is very little, making it possible to re-fit them without any attention. Crankshaft. The centre and two end journals are slightly worn. The balance weights were firmly attached. The journals were half full of sludge. The bearings are very good. Pistons. All the rings were free. The holes in the scraper ring were choked up with carbon three quarters of the way round. The amount of carbon on the tops was not excessive. The one that appeared to have most was weighed and the amount of carbon was 2.47 grammes. Crankcase. The inside walls were covered with a thin coating of carbon sludge but it could not be considered excessive. When cleaned and examined, no flaws or cracks could be observed. Engine Gears. These showed good bedding and bearings were good. Cylinders. The bores of the cylinders were in a very good condition and only very slight wear of the bores could be observed at the top. There was no sign of any scoring having taken place. Cylinder Head and Valves. The carbon deposit was normal. The valve seats had not become burnt and were in a fairly good condition. No.4, 5 & 6 exhaust seatings showed that the valves had been seating slightly lop-sided as reported at 8,000 miles. The exhaust valves do not show any distortion and are a great improvement over previous valves. The inlet valves were in | ||