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 condition of 40/50 bump chassis shock dampers after 60 hours of running.
| Identifier | ExFiles\Box 119\2\ scan0370 | |
| Date | 21th March 1933 | |
| XH268 Files. 21.3.33. 40/50 BUMP CHASSIS SHOCK DAMPERS -------------------------------- FRONT. AFTER 60 HRS. RUNNING. The loads checked up at 90/90 lb. as originally set. The oil leaks were .350 and .450" below normal, the oil having the usual "muddy" appearance. MAIN BUSHES. Made of BZ/PC. with a longitudinal groove at the top of both the large and small diam. bushes, and a definite diametral clearance of .001", these bushes were found to be in excellent condition. There was no reasonable wear. ROCKING SHAFTS - WITH INTEGRAL MAIN LEVERS. The bearing surfaces were unmarked and the inter-lever sections showed no signs of fidgeting, also the keys were undamaged. INTERMEDIATE LEVERS. Both the rocking shaft bores, and the contact surfaces were OK. The securing bolts (drilled type) were quite tight; the elongation measured .050". One face of the N.S. lever was highly polished, where it has evidently been rubbing on the large diam. main bush - possibly due to cylinder bore to bush alignment being incorrect. PISTONS. The bearing surfaces were in good condition, just showing local high spots, and the wearing pads were only very slightly grooved, a maximum depth of .001" being recorded. The maximum diametral wear was .0005" also the expanding discs were sound. CYLINDERS. Except for the local high spots corresponding to the pistons these were in perfect condition. VALVES ETC. The valves, integral hats, and valve seats in the valve | ||