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).
Letter providing diagnostic advice for issues with water over-heating at low speeds and clutch slip.
Identifier | ExFiles\Box 5a\3\ 03-page114 | |
Date | 20th November 1931 | |
G.W.Hancock from Hs{Lord Ernest Hives - Chair}/Hm.{Capt. W. Hallam - Head Repairs} Hotel de France, Chateauroux, Indre, France. X5840 Hs{Lord Ernest Hives - Chair}/Hm.{Capt. W. Hallam - Head Repairs}3/AD20.11.31. Thank you for your note re water over-heating at low engine speeds. The only time we have experienced this previously was when the passages between the front and rear half of the cylinder block became choked. These, in any case, are very narrow and if they get clogged up no water circulates in the rear half of the cylinder block where the thermometer is located and the water there overheats. It is quite easy to see what is happening by removing the inspection covers. If the water is really circulating at all at these speeds we think that this must be the trouble. With regard to clutch slip. We can positively say that by calculation the clutch on 18-GIY ought to have no more tendency to slip than the standard 40/50. We feel sure that if it is slipping it is due to oil getting on the clutch or to the clutch suffering from the oil it received when we ran it at Derby. We should certainly recommend that you completely cut off the automatic clutch spigot lubrication and see if matters improve. If the clutch is better you might then try the standard springs. It is unfortunate that the front springs are too weak. We suggest that you increase front shock absorber loads to 115 up and down as we do not think it is worth while sending out to you a set of heavier springs. You will appreciate that this poundage was only used because they happened to be available in the cheaper type of springs we were wanting to test. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||