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).
The wear and tear of various engine components after testing, and subsequent repairs.
| Identifier | ExFiles\Box 179\3\ img091 | |
| Date | 1st March 1932 | |
| -2- The tappet lever bearing surface of the pin was evenly polished, and showed a decrease from standard size of .001", the corresponding bore in the tappet lever showing .0015" increase in diameter. The connecting pin hole in the tappet lever had increased by .002", and the connecting pin, which was unevenly worn, was .005" across the worst place, whilst the bore in the tappet rod was O.K. During this tests an s/h cam giving full width contact on the tappet lever was used, and after test it was found that the face of the lever was rather badly worn (see sketch attached) the cam surface however was quite good. The main details of the actual pump were in good condition, the fabrics showed no signs of breaking up, except for slight raggedness in the bolt holes. There was a small quantity of white deposit on the uppermost fabric, but the doping was apparently unimpaired. The plunger and guide were in excellent condition, showing no sign of wear. The brass valve seats were very highly polished, and each of the 'bacelite' valve discs was impressed slightly to the shape of its seat, the valve spring had also made a slight impression in the top face. The pump was re-erected for a further test with the redesigned pivot pin - Lec.2996 - which was pressed into the support plate and secured by a nut, the latter being locked by light riveting. When the delivery and maximum pressure were measured, the figures obtained at the beginning of the first run were reproduced, thus confirming that the slack pin had been the cause of the loss in delivery and pressure. Since there were not any more tappet levers available, the worn face of the existing lever was reground and hardened, also the s/h cam was replaced by a model, both as regards dimensions and material (i.e. Ex/Pe ZARONIA CAST 1% PHOS: Y.M.S.) of the actual engine cam. ------------------------ HS{Lord Ernest Hives - Chair}/SL. | ||