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).
Inspection report on the condition of various engine components following testing.
| Identifier | ExFiles\Box 82\2\ scan0133 | |
| Date | 1st August 1934 guessed | |
| - 2 - There was nothing, the rollers and guides were in a good condition. The lift of the cam was taken, and we found that Nos. 1 and 2 were giving a .0312 more lift than Nos. 3 and 4 which had given no trouble. We attribute the failure of N°I Inlet valve spring to being over-stressed, the extra lift of the cam and the lesser valve clearance being just sufficient to show the weakness up. The actual cause of the failure, being too much clearance between the coils when fully compressed, which allowed surging and over stressing of the springs. The springs could be compressed a further .125 when the valve was fully opened. The bottom tappets have been on the noisy side when first started up. WHEELCASE AND FITTINGS LOP. EB. 181. Fabroil gears fitted to camshafts and distributor drives. The timing gears have remained free from sing. The rattle has increased and is affected by the spring drive, as the period of rattle is between 800 and 1,000 engine revolutions. Extra supply of oil made no improvement. All gear wheels were in a good condition. CYLINDERS. The cylinder bores were in a very good condition when examined; lubrication had been ample and even. CYLINDER HEAD. The combustion chambers were entirely free from carbon. Exhaust valve seatings were slightly pitted. Inlet, good seatings. CARBURETTORS LOP. EB.200 S.U. Treated for non-corrosive. LEC.3947 scheme to prevent flooding and drain pipes to prevent fire in case of flooding. There has been no flooding of the carburettors. The plunger for flooding purposes on the front carburettor became tight through what appeared to be due to the plating peeling off. There was no sign of corrosion in the float chambers. We clipped the drain pipes together, which prevented vibration and any further breakages. There have been no other troubles with the carburettors. PETROL FILTER. Examined at 5,000 and 10,000 miles as per instruction book. at 5,000 miles bottom of chamber covered with sand and small particles of fluff on the filter unit. at 10,000 miles small quantities of sand, and filter unit clear. SPRING DRIVE DAMPER. LOP. EB.189. FITTED WITH COTTON DUCK WASHERS. The damper was in a good condition. The friction load had remained consistent 19 lbs. at 17 1/2" radius. Cotton duck washers were in a good condition. With oil temperature below 95°C, this friction load damps out the periods. | ||