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).
Issues concerning the vacuum pump, slipper flywheel clearance, and tappets.
| Identifier | ExFiles\Box 65a\3\ scan0094 | |
| Date | 12th August 1929 guessed | |
| -2- 4. Vacuum Pump. The oil exhausted from the vacuum pump passes into the carburetter intake, and as it is not all absorbed via the intake, a considerable quantity drains out through the carburetter drain pipe. This is blown all over the engine and we feel that complaints will arise from customers. It also puts up the oil consumption considerably. A test taken on 22-EX shewed the amount of oil passed by the pump exhaust pipe to be 1 1/2 cu.ins. in 30 mins, at 800 r.p.m. We think that it would be satisfactory if the pipe were led direct into the crankcase adjacent to the pump. 5. Slipper Flywheel Clearance. The clearance between the rear face of the slipper flywheel is in some cases so small that it gives trouble. It has been necessary to reduce the projecting end of the camshaft until flush with the nut, and also the length of the 4 studs securing the locking plate. 6. Tappets. A noise is consistently experienced from the tappets when warming up. It occurs between 3 and 10 minutes after starting from cold and appears to persistently occur at No. 12 tappet. The only way in which we can overcome it is to reduce the cold clearance of the tappet to a minimum. The noise is also apparent on chassis 22-EX though in this case it does not appear to be any particular tappet. The removal of a tappet is a big job and requires the dismantling of the whole engine. We think that perhaps a slight alteration would overcome this difficulty. Handwritten notes: X^y/510. X^y/300. X7060. Inadequately MX.{John H Maddocks - Chief Proving Officer} | ||