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).
Seizure of the Spectre dynamo drive bush and proposed experimental solutions.
| Identifier | ExFiles\Box 4\1\ 01-page284 | |
| Date | 20th March 1935 | |
| To E/JNR.{Charles L. Jenner} From Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell} +300 Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}22/KW.20.3.35. SpectreCodename for Phantom III Dynamo Drive. E/JNR.{Charles L. Jenner}2/HP.16.3.35; Immediately following the seizure of the dynamo pinion bush we removed the plug above the oil feed passage, oil gushing out. Allowing for a leaking face joint or a small blow hole there would still be an ample quantity of oil to feed the bush and anything worse than this would be noticed during assembly. Both on Phantom and Bentley we had the similar trouble of the dynamo bush seizing and had to go from gravity to pressure oil feed. For experiment we are on No.4 unit taking an oil feed from the low pressure rocker feed to the bush. Up to the present two dynamo bushes have seized and on No.4 unit the idler wheel bush had also seized, although in the latter, the seizing of the idler bush may have been caused by the loading exerted when the dynamo bush seized. The possible reasons why we do not suffer with the idler bush are - (a) That it only runs at 30/47 of the dynamo bush speed. (b) Due to the loadings exerted by the crank pinion, dynamo pinion and cam wheel, the result is that the idler wheel has a different type of loading. As an alternative to feeding the dynamo bush under pressure, we are trying various types of gravity feed. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||