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).
Failure of a high lift pump on vehicle 35-EX.
| Identifier | ExFiles\Box 149\4\ scan0086 | |
| Date | 3rd November 1936 | |
| X1263 To Hs.{Lord Ernest Hives - Chair} c. to E.{Mr Elliott - Chief Engineer} c. to Bv. Rm{William Robotham - Chief Engineer}/JBD{John B. Dixon - Fuel Systems}5/GR.{George Ratcliffe}3.11.36. Re: High Lift Pump Failure on 35-EX. This pump was the second experimental pump obtained from the S.U. Company, and was fitted with a silencing washer and had a reduced stroke which had increased the minimum voltage at which the pump would work. The pump began to be erratic at 2,997 miles which ceased to deliver sufficient petrol with a water temperature of 87°C, and subsequently failed altogether. The pump was returned and replaced with one of the latest, which will work down to 6 volts and has no silencing arrangements. We returned the faulty pump to the S.U. Co., and had it examined in my presence - the failure was due to both armatures fouling the sides of the magnet pots where there should be a clearance of 5 thous, and was due to a machining error on the armature and eccentricity in the diaphragm assembly. These armatures are not standard, and had been made for this pump. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems} | ||