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).
Faults and proposed solutions for noisy petrol pumps, steering issues, and oil leaks.
| Identifier | ExFiles\Box 130\2\ scan0088 | |
| Date | 10th August 1936 | |
| -34- Hs{Lord Ernest Hives - Chair}/DWH.6/WJ.10.8.36.Cont'd.{John DeLooze - Company Secretary} (5) Noisy Petrol Pumps. This complaint has been almost as numerous as overoiling. It must not be confused with evaporation trouble. The complaint is when the engine is idling. The rubber mounting of the pump certainly is a help to silence but is not a cure. The cause is, in our opinion, due to weaker contact springs, which allow the armature of the pump to hit more heavily at the end of the stroke. We have made a cure by a slight alteration to the buffer spring of the contact. This is being taken up with S.U's. Heat under bonnet. The heat under the bonnet affects the pump in two ways. A fairly quiet pump becomes noisy when hot due to the increased flexibility of the diaphram. The air bubbles in the pipe line and pump chamber which causes a quicker motion of the pump. This was aggravated on Sg{Arthur F. Sidgreaves - MD}'s. car because of the mounting of the pump on the steering column which brought one unit in closer proximity to the cylinders. The pumps are giving trouble due to air leaks. The nuts holding the pump body to the valve chamber are found to be loose after a short while in service. This is due to the settling down of the fabrics after heating up. This trouble could be considerably reduced by finally tightening up the nuts during the final coachwork test. (6), (7), & (8). Marles Steering, Joggles, Loss of Oil, Wandering. The whole question of the Marles Steering has been looked into. The faults have been chiefly due to erecting errors. It has been found that the loads on the steering wheel on new steerings not fitted have varied from 2 to 4 lbs. The bantam 111 steering have not given trouble and the first 30 HP. steerings as fitted to Trials cars were satisfactory. With the introduction of the improved ball races and the promise of Sft.{Mr Swift} to investigate the fitting up, and machining of parts the troubles met with should be cleared up. (9) Leak of oil from filler cap. We have sent recommendations to cure this trouble. The chief cause is, the pressing does not fit the cast pipe and oil flows from between the joints. Da.{Bernard Day - Chassis Design} has replied that a new filler cap incorporating the recommendations is now in production. | ||