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 components including connecting rods, pistons, and cylinders.
| Identifier | ExFiles\Box 97\4\ scan0193 | |
| Date | 24th November 1938 | |
| - 3 - HPS.{Horace Percy Smith - Experimental Factory Mgr}6/VS.{J. Vickers}24.11.38. Connecting Rods - continued. score marks are apparent on Nos. 3, 4 and 6 - see attached photographs and chart. The little-end bushes are satisfactory and show no signs of wear; Nos. 3 and 4, however, have worked loose in the rods. All rods passed the magnetic test for cracks. Pistons. Tin plated "Aerolite" pistons with raised crowns, supplied by Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}, were fitted. All pistons with one exception are in good condition. No.2 piston shows a slight crack approximately .200 in length at the bottom of the skirt. The ring and groove wear is normal. Slight scoring is evident on the bearing surface of all pistons. A seizure of No.6 piston occurred in France; this was replaced by a standard "Aerolite" piston with flat crown - see photographs and charts attached. Cylinders. Complete to LOP.EB.3654 and including Ex.29685 Cylinder Head which incorporates the push rod tubes E.CD.775. Cylinder Block. All cylinders are slightly scored, Nos. 6 and 3 being particularly noticeable in this respect. With this exception the block is satisfactory - see wear chart attached. Cylinder Head. The general condition of the head is good except for Nos. 2, 3, 10 and 11 valve seats which are cracked. A photograph of Nos. 2 and 3 is attached. From the appearance of the inlet seatings the valves have failed to make a seal over the full seat area. In the majority of cases the leakage has occurred adjacent to the exhaust valve. continued. | ||