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 issues related to gudgeon pins and oil pressure, along with car weight, oil type used, average speeds, and tyre mileage.
| Identifier | ExFiles\Box 125\2\ scan0183 | |
| Date | 12th December 1934 guessed | |
| - D - ENGINE. Since beginning this report, the engine had to be dismantled, owing to knocks developing from the gudgeon pins. It was found that they had partially seized and worn the bushes in the pistons considerably. We have had difficulty in obtaining new bushes, as the General motors in three countries did not keep a sufficient supply. The cause would appear to be due to lack of oil and we presume the lack of oil is when starting up in the morning and running the engine too slow. The oil pressure not being sufficient to reach the gudgeon pins. There is no reference to running the engine when cold in the Cadillac construction book, but evidently the oil pump does not give sufficient pressure at low speeds. There is an escape of oil from the connecting rods to feed the cylinder walls. WEIGHT OF CAR. TONS. CWT. QRS. LBS. 2 18 0 0 MOBILOIL "D" USED IN ENGINE. Average speeds of 45 and 50 MPH. were regularly maintained during daylight. Rear Tyre mileage DUNLOP Buttress Tread 7.50 x 17. Pressure 35 lbs. Average 4500 miles. Front 6100 wearing uneven. - - - - - - - - G.W.H. | ||