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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 failure analysis of AC.9 big end bearings with Leyland Motors and Rolls-Royce.

Identifier  ExFiles\Box 115\4\  scan0066
Date  13th May 1940
  
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 1666-7
BIRMINGHAM
143 SUFFOLK STREET
TELEPHONE: MIDLAND 0638-9
MANCHESTER
232 DEANSGATE
TELEPHONE: BLACKFRIARS 5914
NEWCASTLE
MILLICAN'S BUILDINGS, MARKET ST
TELEPHONE: 25575-6

SERVICE DEPOTS
LIVERPOOL
75 PARADISE STREET
TELEPHONE: ROYAL 5786
LEEDS
82 WOODHOUSE LANE
TELEPHONE: 26774
CROYDON
246 HIGH STREET
TELEPHONE: 6181-2
SOUTHAMPTON
17 PORTSWOOD ROAD
TELEPHONE: 74778
HULL
285 ANLABY ROAD
TELEPHONE: 15312
CANTERBURY
21 & 22 ROSE LANE
TELEPHONE: CANTERBURY 2456

ON ADMIRALTY, WAR OFFICE
AIR MINISTRY, INDIA OFFICE LISTS

WELLWORTHY
PISTON RINGS
LIMITED
PISTON & PISTON RING SPECIALISTS
LYMINGTON HANTS
WORKS & HEAD OFFICE: STANFORD RD

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/AS.
Ext.26.

YOUR REF

TELEPHONE:
LYMINGTON 520 (5 LINES)
TELEGRAMS:
WELLWORTHY
CODE: MARCONI

13th May, 1940.

G.S.Salt. Esq.,
Messrs. Rolls-Royce Ltd.,
Derby.

Dear Mr. Salt,

Confirming the visit of Mr. Plummer and the writer to your works on Thursday last when we discussed briefly the AC.9 big end bearings which had failed in service on a Leyland vehicle, we should appreciate a line from you at the earliest possible moment as to your opinion as to the cause of failure and also a report from your Laboratory regarding the material itself.

We have this morning given Mr. Markland of Leyland Motors the opinions expressed by ourself, Mr. Lovesay and also by Mr. Warrington of High Duty Alloys and you may be interested to hear that the one opinion expressed by all parties, in which we are in agreement is that these bearings have operated under a dry condition and this has primarily caused their failure.

Mr. Markland's reaction to this is that they quite agree that this is so, but that under like conditions white metal has not failed them and his view is that the AC.9, whilst doing all that is required of it on test bed does not, particularly during the cold weather of this last winter have sufficient margins of safety when starting up from cold to look after itself until oil is properly circulating.

Incidentally they have revised the drilling of the crank-shafts and have drilled right through the crank-pins in the prescribed manner which I believe was suggested by your people to get the best results on this AC.9 material and further the oil pressure which these engines operate is 80 lb. per sq. inch.

ROLLS-ROYCE
A.C.9. BEARINGS

ALUMINIUM
CASTINGS

LABORATORY
TESTING

CYLINDER LINERS
& LINER CASTINGS
  
  


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