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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).
Material requirements for 200 sets of the 'Z' series 20/25 HP chassis, noting exceptions compared to the 'Y' series.

Identifier  ExFiles\Box 142\2\  scan0192
Date  10th January 1933
  
Y4554.
ROY.{Sir Henry Royce}
c. Hs.{Lord Ernest Hives - Chair}
c. E.{Mr Elliott - Chief Engineer} Dept.
c. F.{Mr Friese} Dept.
c. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Dept.
c. D.{John DeLooze - Company Secretary} Dept.
c. Sft.{Mr Swift}
c. BY/NW.{N. Walker - Patents}

20/25 HP. CHASSIS - RE: MATERIAL FOR 'Z' SERIES.
(200 SETS).
------------------------------------------

Will you kindly note that with the exception of the following sections, the material for the above series will be precisely the same as that for 'Y' series. You can therefore go ahead and order up the material in question working from 'Y' series part lists. The sections held up are :-

(1). Carburetter, with the exception of the following parts, the same as 'Y' series:-

E.51213 Stud (Air Intake to Body).
E.51463 Spray Chamber.
E.53192 Air Intake Cap.
E.53483 Bush (Air Intake Elbows).
E.54312 Control Lever L.S.
E.55405 Air Intake.
E.55407 Breather Elbow.
E.55408 Breather Gauze.
E.55409 Breather Gauze Frame.
E.55783 Air Valve Arrgt.

(2). Parts covered by the use of the Silent Second Speed, as follows :-

G.55639 Bush - Rear. Reverse Shaft.
G.55644 Cover - 2nd. Motion & Reverse Shafts.
G.54755 Selector Jaw & Fork. 1st. & 2nd.
G.54756 Selector Shaft. 1st. & 2nd.
G.54727 1st. Speed Driven Gear.
G.54725 2nd. Speed Driven Gear.
G.55667 3rd. Motion Shaft.
Hoffmann Ball Bearing No. 335.
  
  


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