Inspection report detailing the condition of various engine and chassis components after a mileage test.
| Identifier | ExFiles\Box 83\4\ scan0031 | |
| Date | 2nd November 1935 guessed | |
| ( 2 ) CRANKSHAFT. LOP EB.1211 The Crankshaft connecting rod pins were in a good condition. The main journals were not examined at this mileage. OIL PUMP. LOP E.53658 ARRAGT. II955 The oil pressure has been maintained. It has been quiet. The release valves free from vibration noise. VALVE & FITTINGS. LOP EB.141. The Valves were dismantled and examined. There were pit holes in all the exhaust valve seatings. The appearance was, that fine pieces of metal were scaling off. The remaining portion of the seat was of a high polish. On No 10, there was a track mark, a feature which is the start of the seat burning. On No 12, the lead could be seen on the outer edge of the seating. The Valves showed that more than usual oil was being drawn down the Valve guides, although in running we had not noticed a smoky exhaust when starting up. The Cylinder heads were in a fair condition. Exhaust showed markings similar to the Valves. Inlet seatings were good. The Valves start to bounce at 4,600 R.P.M. At 4,700 they are definately bouncing with Tyres 5.50 x 18 - 105 MPH. with the small tyres 6 x 16 the Valves bounce at 98 MPH. CYLINDERS. LOP EB.309. The Cylinder bores were free from any sign of scoring. All bores were well lubricated. WATER PUMP. LOP EB.687. There has been a constant leak of water from the pump gland. Upon dismantling, it was noted that the grease cup body, which acts as a register for the pump barrel, had not been registering correctly and had been forced by the bolting up of the aluminum bridge into the pump barrel, this had prevented the load of the spring in the expanding plunger gland barrel from operating, consequently the rear asbestos packing had deteriorated. We have corrected this & re-packed the glands. CARBURETTERS. S. U. LARGE TYPE. The front Carburretter started to leak down the mixture control jet pipe. This was eventually found to be due to the pin jaw being loose on the stand pipe, and petrol was leaking past the thread; tightening up and soldering the jaw to the stand pipe cured the trouble. From a series of tests the L.B.I Needles gave the best allround results. A speed of 101 MPH was obtained with a consumption of 13.28 MPG. with an average speed of 58.5 MPH. Slow running was up to standard Bentley. We have not noticed any faults in the metering of the Carburetters with the L.B.I Needles. | ||
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).