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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).
Extract detailing an oil leak issue with the vacuum pump on the S.S. Chassis and proposing a fix.

Identifier  ExFiles\Box 64\1\  scan0046
Date  1st August 1929
  
EXTRACT FROM :-
X/Y510.

Hs.{Lord Ernest Hives - Chair}
c. By.{R.W. Bailey - Chief Engineer}
______

Mx{John H Maddocks - Chief Proving Officer}5/OG8. 8. 29.
_________

Re. S. S. CHASSIS.
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4. VACUUM PUMP. The oil exhausted from the vacuum pump passes into the carburetter intake, and as it is not all absorbed via the intake, a considerable quantity drains out through the carburetter drain pipe. This is blown all over the engine and we feel that complaints will arise from customers. It also puts up the oil consumption considerably. A test taken on 22-EX shewed the amount of oil passed by the pump exhaust pipe to be 1 1/2 cu. ins. in 30 mins, at 800 r.p.m. We think that it would be satisfactory if the pipe were led direct into the crankcase adjacent to the pump.
  
  


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