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).
Technical report detailing modifications to address gearbox oil leaks and a subsequent examination of the car.
| Identifier | ExFiles\Box 91\4\ scan0108 | |
| Date | 16th July 1935 guessed | |
| ( 2 ) Previously neither the cones nor the sleeve were getting any direct oil. Alterations made, have been to plug up the reverse shaft at the front end. The perforated bush and hollow shaft, was taking a stream of oil from the front compartments direct to the rear, without any reason. The Oil catcher on the Diaphram for the reverse bearing shaft, we have also stopped up, as the rear compartment is almost solid with oil. By doing this, we are maintaining more oil in the front compartment. We are also trying 7 pints of oil instead of 6. Upon dismantling the Damper unit drive, we found that the spindle with the acme thread had in some way torn all the acme thread off. This would, to an extent, be one of the causes of loss of oil from the gear box. We telegraphed for a new spindle complete. GEAR BOX OIL LEAKS. There are two distinct places where the oil was leaking out of the Box. Both are the servo drive shaft bearings. As previously stated, this compartment is under working conditions, simply one mass of oil. The second speed wheel, piles the oil in the corner of the damper unit drive to such an extent, that the ball race was smothered. The worm drive collaring the oil, still further piles it into the bearing. At the servo end, there is a river of oil coming off the drives at the bottom, flooding the bearing. To prevent the oil going through the bearings, we have fitted a dished washer at each end, entirely covering the bearing. These act as baffles, and prevent the direct flow of oil going through. We have also, on the damper unit side, drilled a hole in the bottom of the housing of the Speed-ometer drive and fitted a 1.1/4 " copper pipe, approximately 6 Inches long to drain back any oil getting through. We had to fit the pipe, otherwise, instead of draining, oil was forced through from the box. The Servo side, we have had to block up the front of the drain cavity under the ball race, as no oil could get out, ( it was going in ). In its place we drilled through, and fitted a drain pipe away from the stream of oil. These modifications seem to be answering very well, and should prevent the loss of oil from the Gear Box. EXAMINATION OF CAR AFTER THIS MORNING'S RUN. There is a slight leak of oil from the front dampers at the joint of the spring pot outside the frame. GEAR BOX. There is a slight leak of oil from the front bearing, no other serious leak, but results will be checked to-night. 100°c temperature of oil was reached. Synchromesh 3rd very lumpy top easily crashed. CLUTCH. No sign of slipping, old fabrics retained. ENGINE. Bad oil leaks from front and bottom joints, tappets occasionaly noisy. G.W.H. S.H.Hancock. | ||