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 dismantling of a 4 1/4 Litre Trials Car engine due to failed bearings and a list of urgently required replacement parts.
| Identifier | ExFiles\Box 146\3\ scan0054 | |
| Date | 26th August 1936 | |
| Handwritten: Coles Swott. Pass these orders on to C.E.P. please. 1245 AHS Rm{William Robotham - Chief Engineer} To Bentley Motors Ltd. Derby............. Hs.{Lord Ernest Hives - Chair} Copy to Rm.{William Robotham - Chief Engineer} Sp.{Mr Spinney} is absent Levallois WHA2/ET.26.8.36 Re: CHASSIS B.8.GA - 4 I/4 LITRE TRIALS CAR.. After completely dismantling the above engine on account of an abnormal noise which made us fear that the connecting rod bearings had failed, and on examining the connecting rods and main bearings, we found the following: The connecting rod bearings had worked loose in their housings, especially NoI bearing, Metal broken away from bearing liners, Bearings also badly scored, The same applies to the main bearings, No7 bearing being very slack, which caused a large quantity of oil to escape behind the flywheel. The following are the measurements of connecting rod bearing NoI and of main bearing No7: CONNECTING ROD BEARING NoI. Internal diameter of bearing = 2.018" Diameter of crankshaft = 1.998" Play = .020" REAR MAIN BEARING Internal diameter of bearing = 2.260" Diameter of crankshaft = 2.247" Play = .013" We enclose our order form for the following parts, which we urgently require: 6 connecting rods complete with Hall metal bearings, I complete set of main bearings, 2 felt glands for rear cover of the crankcase, 12 bolts } holding flywheel to crankshaft, 12 nuts } I complete set of piston rings. WHA. | ||