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).
Failures of valves, fittings, wheelcase, and oil pump during testing.
| Identifier | ExFiles\Box 83\2\ scan0059 | |
| Date | 31th May 1937 guessed | |
| ( 4 ) VALVES & FITTINGS. (Continued) The following parts failed in this order:- N° 7 Exhaust Valve S/SLV. 7,700 miles. N° 7 Valve Spring (Tempered Spring Co.) 10,000 miles. N° 7 Exhaust Valve KE.965 (Stellited) 7,000 miles. N° 6 Exhaust Valve KE.965 (Stellited) 15,500 miles. When the exhaust valves failed, the inlet valves were damaged by the broken pieces. N° 8 inlet valve was replaced on two occasions. The head was returned complete after the last failure. WHEELCASE & FITTINGS. LOP. EB.2707. Existing, complete to above LOP. incorporating:- 1 - Ex.22807 Wheelcase to suit Engine Suspension. 2 - Ex.22811 Torque Arms. The studs securing the O.S. torque arm to the wheelcase worked loose. One came out and was lost and one broke off. We understand that this detail will be different on the final design. OIL PUMP. LRO.4288-4291. Existing, complete to the above LOP. Large Helical Oil Pump. Removed after 2,500 miles and replaced by new large oil pump with 22° Helical gears. Oil pressure loss after braking with delayed recovery sufficient to cause bearing rattle was experienced with the first pump. A delay of three minutes before recovery was reported when the engine was left ticking over after braking. A new pump with modification to overcome this trouble was fitted. The symptoms complained of could still be produced to a lesser degree. The maximum delay was 20 seconds, and no ill effects occurred. With a direct oil pipe short circuiting the pressure filter, there was no delay with this new oil pump. The second oil pump was very noisy for several minutes when cold, and would be objected to by an owner. [Handwritten Note] Sudd How are the tests going. What about larger relief valves | ||