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).
Various vehicle issues observed at different mileages, including loose headlamps, oil loss, and noisy valves.
| Identifier | ExFiles\Box 16\5\ Scan134 | |
| Date | 2nd November 1933 guessed | |
| -2- (2) At 600 miles both headlamps became loose on their pillars. The lamps have since remained tight. (3) On several occasions oil loss has taken place from the governor system, owing to a leak from the control pipe elbow on the front dampers. This has been caused from the axle control hitting the elbows on maximum bump. On the production bellows control to RR.Sch.469 there is ample clearance for the axle control. (4) At 1500 miles the main release valve in the governor system Hs.{Lord Ernest Hives - Chair}770 started to emit a faint weezy noise. This is only audible at low speeds when the over-riding control is in the maximum position. With the production scheme, owing to a difference in the over-riding control maximum pressure, the main release valve does not come into operation until 30 m.p.h. There should therefore be no difficulty in overcoming this complaint. (5) At 3800 miles the N.S.R. damper became short of oil. This damper is very near the exhaust system. It is expected that the maximum oil temperature in the damper is above the melting temperature of the tallow in the gland. Tests are being carried out to prove this. In order to confirm this trouble we have fitted a new pair of the latest production dampers. We find bearing clearances make more difference to gland leaks than anything else. Production rocking shafts are fitted with much less clearance than is asked for on the drawing, and than our Expl. Dept damper. (6) Noise from damper valves. These valves are much closer to the noise danger zone than the previous type valve. On two occasions we have had valves noisy for the first 100 miles after fitting. When once all the air has been replaced by oil behind the damping disc the damper is quiet. With the reduced valve lift and the fact that air collects in the convolutions of the bellows, the amount of running that is required before the damper is quiet is more than the previous type valve. We are using .010" diametrical clearance for the damping disc, so if any trouble did arise from noisy valves the reduction to .005" clearance would overcome it. However, at the moment this is quite unnecessary. | ||