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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).
Instructions for adjusting linkage movement and troubleshooting the oil relay system, including piston removal.

Identifier  ExFiles\Box 65\1\  scan0182
Date  29th September 1926
  
contd :- -7- Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG29.9.26

the movement of the linkage should be reduced by lowering
Cap E.72495 and reducing the thickness of its packing washer.

It is very important that the limit of the movement
of the automatic advance should be dictated by the position
of Cap E.72495 and not the movement of the controls. Unless
this is so, the controls will undoubtedly be strained owing
to the very powerful force which can be exerted by the oil
relay.

It is desirable that the working of the relay should
actually be checked on the car before it leaves the Depot.
This can be accomplished in the same manner as the initial
test for the complete unit, the extension to lever E.72578
being so made that it can be fitted when the other controls
are coupled up to the relay. The angular movement of the
lever E.72518 should then conform with the specified curve.

In the case of grit causing trouble in the relay,
the small inner piston should be removed as described in the
Instruction Book. In the case of the cup leather failing,
and this is a most probable source of trouble with the relay,
the Piston E.72509 (described as X. in the Instruction Book)
which carries it should be removed as follows :-

(a) Remove small piston as described in
Instruction Book.

(b) Remove the 4 nuts holding piston chamber
on to the crankcase and remove chamber
complete.

(c) Invert chamber and extract piston which
should fall out by its own weight.

contd :-
  
  


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