Cost comparison for repairing damaged flywheel gear rings, considering design alterations.
| Identifier | ExFiles\Box 8\1\ 01-page28 | |
| Date | 12th December 1936 | |
| c to Bm/Smth. re FLY-WHEEL GEAR RINGS. With reference to your enquiry concerning the cost of carrying out repairs when the flywheel gear ring has become damaged, we have made a comparison us between the work necessary to change the flywheel, which includes dismantling the crankshaft and re-balancing, and the work involved in fitting a new loose gear ring only, assuming that the design allowed for this. The labour in the former case amounts to £15:16:0. This covers removal of the gearbox, lower half, radiator and engine front, flywheel, clutch and crankshaft. It also includes re-balancing the complete flywheel and crankshaft. If the design were altered to allow for a detachable gear ring, the labour involved would amount to £10:10:0, since the crankshaft could be left in position because the balance of the flywheel and crankshaft would not be disturbed. In addition, it has to be remembered that the latest type of flywheel on the 25/30 HP. and 4 1/4 Bentley cannot be turned down to take a loose ring, so the flywheel itself would have to be renewed, the material cost of which would be approximately £3:15:0. We do not know how this compares with the cost of the proposed new gear ring. In regard to labour, therefore, the annual saving to the Company, assuming that only ten cars have to be attended to under the Guarantee, would be only 60 guineas, as against the increased additional annual cost of the proposed new design. The evidence at present would indicate that flywheel gear rings are becoming less susceptible to damage due to improvements in starter motors. Hd {Mr Hayward / Mr Huddy} /SB {Mr Bull/Mr Bannister} | ||
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).