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).
Procedure for modifying the Phantom III clutch trunnion to improve oil supply on existing cars.
| Identifier | ExFiles\Box 93\3\ scan0457 | |
| Date | 8th March 1939 | |
| 312 file TO: HA <s>Levallois</s> <s>Stk. Nice</s> <s>Kln. Glasgow</s> <s>Kin. Bombay</s> <s>c. to JSH (F)</s> c. to RH{R. Hollingworth}/RRG WRP noted HY{Tom Haldenby - Plant Engineer}/SB.{Mr Bull/Mr Bannister}3/MS.8.3.39 PHANTOM III - CLUTCH TRUNNION In order to improve the oil supply to the clutch thrust race, a modification to the trunnion has for some little time been used on production, this consisting of a circumferential groove in the trunnion, together with suitable slots at the bottom to feed the oil into the bearing. In order, however, to simplify the adaptation of this idea to existing cars, a scheme has been got out to Drawing S.CD.496, which avoids the necessity for setting up the trunnion in a lathe for machining the groove, and it is recommended that this modification be adopted when dealing with complaints of noisy thrust races on cars at Depots. We attach a Blue Print of S.CD.496, the procedure being as follows: (1) Before unscrewing the serrated retaining nut, it should be marked on the top centre so as to locate the position of the oil groove. (2) After unscrewing the nut, a hole .105 dia. should be drilled at an angle of approximately 30° just behind the shoulder, so as to break through about .050 inside the inner facing. (3) A groove in the thread should be added by means of a flat ended drill .156 dia. to a length of approximately .300 from the joint facing. (4) A similar groove to be added on the centre facing where the drill has broken through. In any subsequent dismantling and re-erecting it is important to see that the marks coincide, otherwise the oil grooves will be obscured. (continued | ||