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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).
Bentley Oil Flow Test, detailing established times for bearing conditions and specific test results.

Identifier  ExFiles\Box 114\3\  scan0085
Date  1st June 1938
  
File

To By... from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}
c. to Mx.{John H Maddocks - Chief Proving Officer}
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Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}12/N.1.6.38.
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Re: Bentley Oil Flow Test.
-----------------

The established times for determining the
condition of bearings are as follows:-

Good bearings... 7 mins. upwards.

Bearings need attention with a flow of 4 mins.30 secs. and under.

Artic oil is being used for the tests.

Occasionally there may be a case of a higher
time limit than 4 mins.30 secs. when the bearings need
attention. This relies on the chief tester's report,
and would be left to the discretion of the chief engineer.
A case of this sort arose over B.130.GA. The tester
reported thump, time flow was 4 mins. 46 secs. Tester
was definate in his report.

Engine dismantled .010" sinkage was found on
journal bearings.

The following are times and sinkage:

Mins. secs. sinkage.
2 43 .012" }
2 43 .010" }
2 30 .010" } total.
2 05 .012" }
1 35 .014" }

Unfortunately the sinkage figures have not all
been recorded. This is going to be in the future. Will
you please let me know whether you require any further
information.

GWH.{George W. Hancock - Head Chateauroux}
  
  


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