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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).
The composition and failure analysis of bearing material A.G.S.B.

Identifier  ExFiles\Box 115\1\  scan0324
Date  23th April 1937 guessed
  
BEARING MATERIAL A.G.S.B.

Brinnel No.83.5

COMPOSITION.

Silicon ........ 2.2%
Tin ............ 5.0%
Antimony ....... 0.5%
Nickel ......... 1.5%
Manganese ...... 0.75%
Magnesium ...... 1.0%

Remainder pure aluminium.

Clearance (cold) when fitted = .004".
Clearance (hot) last check prior to failure = .006".

V.C.M. sleeve Brinell No.739.

Failure occurred after 1 hr. 28 mins. at 3030 RPM. i.e. 2300 lbs/sq.in.

TYPE OF FAILURE.

Solid seizure without warning.

The bearing appeared to have numerous hard spots on its surface, which had scored the sleeve, finally resulting in total seizure taking place.

Total running time of bearing = 31 hrs. 37 mins.
  
  


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