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).
Sluggish air valve on Chassis 20-MY and recommended inspection procedures.
| Identifier | ExFiles\Box 18\4\ Scan023 | |
| Date | 28th March 1933 | |
| COPY. W/S Cx.{Major Len W. Cox - Advertising Manager} c. H.{Arthur M. Hanbury - Head Complaints} c. AA.{D. Abbot-Anderson} EP{G. Eric Platford - Chief Quality Engineer}4/H28.3.33. re. CHASSIS 20-MY. We were rather surprised to receive a copy of report reference AA{D. Abbot-Anderson}9/RB.{R. Bowen}27.3.33., since as a matter of fact we have at times experienced similar trouble to that reported, but have never been sure of being able to demonstrate or reproduce it at will. So far we are rather of the opinion that the trouble is due to the air valve working sluggishly and does not return to its normal position by the time the throttle has again been re-opened. Will AA.{D. Abbot-Anderson} withdraw the air valve carefully inspect for the condition of oil on the spindle and also on the periphery of the piston, also see if the air valve is free on the guide pin, and report to us accordingly. Before re-fixing, he should make sure that the air valve is free on the guide spindle This can be done by testing the air valve on the guide pin separately, also see that all traces of oil are removed from the periphery of the piston and the bore of the cylinder in which it runs. Also the vent hole at the top of the cylinder, i.e. at the bottom of the thread for the cover, is perfectly clear. A check that the air valve is not sticking may be made by accelerating and retarding with the above cover removed and note that the air valve does lift and return fairly quickly. We should like to know whether, after doing the above, the trouble can be reproduced, if not whether by free use of oil through the cover the trouble can be reproduced. We feel that possibly the trouble is due to excessive use of oil through this cover, and it may be necessary for some action to be taken to avoid such excess of lubrication producing the above possible trouble. EP.{G. Eric Platford - Chief Quality Engineer} | ||