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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).
Inspection report on the condition of a piston, cylinder, filter, and intermediate lever, with specific measurements and wear analysis.

Identifier  ExFiles\Box 11\3\  03-page258
Date  15th August 1930 guessed
  
-2-

(slightly tapered). The "not go" of a standard limit
would not pass through. The piston diameter varied .002"
but this was apparently more due to distortion than wear
(since the machining marks were still in evidence all round)
and may possibly have been in this condition when assembled.
The cylinder was O.K. and also the guides were
in excellent condition.
The filter was practically free from foreign
matter but there were one or two small pieces of metal
resting on the refill ball valve.

OFF SIDE.

As in the N.S. the oil was O.K. The loads
when checked with the valves in their correct seatings were :-
Low pressure 120 lb.
High " 110 lb.
The intermediate lever - F 32452 - was case-hardened at the
small end and had an oil hole at the top to allow splash
lubrication of the pivot bush. When assembled no end play
could be felt, and the maximum side play was .004"
When stripped the maximum measurable wear on the pivot bush
was .00025" and the maximum diameter of the intermediate
lever bore .501" (Incidentally, the "go" end of a .500"
limit gauge would not pass right through, the bore being
slightly tapered).

The piston and cylinder were in excellent
condition.
  
  


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