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).
Gearbox servo, exhaust, and radiator fitting issues and modifications.
| Identifier | ExFiles\Box 5a\3\ 03-page175 | |
| Date | 14th December 1931 guessed | |
| -2- gearbox. There was also a plentiful supply of oil in the rear servo bearing but we could not find any trace of this oil on the servo plates. We have dried out the oil from the fabrics and made certain that the drain holes are free. We have been running without the gearbox undershield with a view to deleting it. We found, however, that the whole of the servo became clogged up with mud which may have been the cause of the oil not draining away. We cannot under these circumstances do away with the gearbox undershield. The 35º ball bearing cams have worked very smoothly. Upon dismantling we noticed that dirt had entered. The covering ring would be improved by being approx. .030 broader. EXHAUST FITTINGS to E.S.3385-6-7. Complete to the above E.Schemes with the exception of Rear Silencer which was assembled to E.79334. F.II. Short Type Rear Silencer fitted. Heat Shields modified to suit. 2" dia. Downtake and Intermediate pipes. Front Expansion Box to E.S.3286. 1.5" dia. Swanneck Pipe E.57013. Fishtail E.57017 - 1.875 sq.in. area. E.57004 Exhaust Manifold (C.I.) 2.000" dia. The exhaust manifold cracked between the centre and rear ports at a mileage of 6,800. It was believed that with a freer exhaust there would be less heat, and the manifold would not contract to the extent as to cause a fracture. This theory was proved to a certain extent as previously the manifolds had cracked at a mileage of 5,000. The present manifold that had cracked had, however, contracted .250" over its overall length and the two outer flanges had twisted inwards, and the underside of the pipes had collapsed inwards. A full size sketch of the distortion has already been sent. It was intended to fit a later designed exhaust manifold but apparently it was not ready, as we have not received it. The exhaust sound has been very tinny when starting up from cold and when running slow. A short period from the snout could be heard at an approx. speed of 38 M.P.H. The exhaust on the overrun was quite fair. The stay from the frame holding the intermediate pipe broke close to the welding. The silencer and snout have given no trouble and are still in good condition. The sliding joint was inclined to stick at times with the distortion of the intermediate pipe. We had trouble with the nuts holding the centre port of the manifold continually working loose. It was observed that the cause was the stretching of the studs at the extreme end where the section is reduced after the thread. We have previously had this trouble, the studs finally breaking. RADIATOR & FITTINGS. to LOP.E.56831 W.E.8313. RADIATOR SHUTTERS to LOP.E.56828 (STAYBRITE FINISH) Complete to the above LOPs'. Radiator dropped 4" in Frame. | ||