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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).
Alteration note for a crankcase and cylinders, detailing the deletion and modification of various features.

Identifier  ExFiles\Box 118\1\  scan0146
Date  15th March 1940
  
IO NTH.
115/RE
1022 & 1117
15th March 1940
Ripplet
Section 5000
RE. 106. Crankcase and Cylinders
2 sheets
Alteration
1. Boss for Distributor Pipe has been deleted together with the following dims.
Side elevation
9.225 +10/-10 from front face
6.460±18 from bottom face
.850 Dia of boss.
Note:-
Drill .3838+5 Dia
Tap .4375 Dia
18 T.P.I. RH.{R. Hollingworth}
Section FF
4.808 Height of boss.
2. Spotfacing of 4 Bosses, shown in side elevation, altered from .5625 Dia to .750 Dia.
3. Thread altered from .3125 to .250
SECTION IN VIEW OF ARROW X added
4. COUNTERBORE .075 +10/-10 DEEP added to holes in Timing Gear facing
  
  


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