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 from Wellworthy Piston Rings discussing the use of AC.9 bearings for Big Ends and Main Bearings, with reference to Leyland Diesel Engines.
| Identifier | ExFiles\Box 115\4\ scan0011 | |
| Date | 17th July 1939 | |
| 1020a. SERVICE DEPOTS LONDON 89 BLACKFRIARS RD S.E.1 TELEPHONE: WATERLOO 5762-3 172 GT. PORTLAND ST.{Capt. P. R. Strong} W.1 TELEPHONE: MUSEUM 2433 119 LEYTONSTONE RD STRATFORD, E.15 TELEPHONE: MARYLAND 2439 BIRMINGHAM 143 SUFFOLK STREET TELEPHONE: MIDLAND 0638 MANCHESTER 232 DEANSGATE TELEPHONE: BLACKFRIARS 5914 NEWCASTLE MILLICAN'S BUILDINGS, MARKET ST TELEPHONE: 23874 ON ADMIRALTY, WAR OFFICE, AIR MINISTRY, INDIA OFFICE LISTS WELLWORTHY PISTON RINGS LIMITED PISTON & PISTON RING SPECIALISTS LYMINGTON HANTS WORKS & HEAD OFFICE: STANFORD RD SERVICE DEPOTS LIVERPOOL 45 RENSHAW ST.{Capt. P. R. Strong} TELEPHONE: ROYAL 5786 LEEDS 82 WOODHOUSE LANE TELEPHONE: 25774 CROYDON 246, HIGH STREET TELEPHONE: 6121-2 SOUTHAMPTON 17 PORTSWOOD ROAD TELEPHONE: 74778 HULL 285 ANLABY ROAD TELEPHONE: 15312 CANTERBURY 21 & 22 ROSE LANE TELEPHONE: CANTERBURY 2456 DIRECTORS: G.{Mr Griffiths - Chief Accountant / Mr Gnapp} H.{Arthur M. Hanbury - Head Complaints} ALEXANDER J.{Mr Johnson W.M.} W. HOWLETT C. B. KAY P. WALDEN C. W. WATERS A.{Mr Adams} J.{Mr Johnson W.M.} WOOLCOTT OUR REF FB/CJR. Ext.26. TELEPHONE: LYMINGTON 520 (5 LINES) TELEGRAMS: WELLWORTHY CODE: MARCONI YOUR REF 17th July, 1939. W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce, Ltd., Derby. Dear Mr. Robotham, Many thanks for your letter of the 15th inst., the first part of which I am passing over to Mr. Howlett, as he was of the impression that Mr. Salt could be called upon at any time, and it was at his request that I wrote you. Regarding the last paragraph of your letter, you mention that you are using AC.9 for Big End Bearings only and babbit for Main Bearings, but I am sure you will be pleased to know that the East Kent Road Car Co., who operate large vehicles, are having entire satisfaction from AC.9 Main Bearings as well as Big Ends on the 8.6 litre Leyland Diesel Engine. Incidentally I am fully of the impression that Leylands themselves use RR.56 as Main Bearings. If this is so then I see no reason why AC.9 cannot be substituted. I will admit that lubrication as a whole should be watched carefully, and further in the case of a fairly long Bearing such as rear Mains, which are also the thrust Bearings, it is probably advisable to make these Bearings in two halves - I am not, of course, speaking of the halves to complete the circle, but two halves lengthwise, with a view to reducing some of the expansion of the Bearing, as otherwise it means a big end clearance when cold which results in a certain amount of end movement of the shaft, which is to be avoided at all costs. However, time alone will show how far it can be used as a Main Bearing in addition to Big End, but so far on the heavy diesel | ||