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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).
Request to machine plungers for self-adjusting tappets (28-EX), including a list of current dimensions and clearances.

Identifier  ExFiles\Box 17\6\  Scan292
Date  26th July 1934
  
To RHC.{R. H. Coverley - Production Engineer}
4706D
Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}17/KW.26.7.34.

Self-Adjusting Tappets (28-EX).

Will you please machine the plungers for this set of tappets to give a diametrical clearance of .00225 in their respective pedestal barrels.

The following is a list of the dimensions and clearances taken by the inspection in their present condition :-

No. Bore Dia. Plunger Dia. Clearance Dia.
1 .625 .6245 .0005
2 .625 .6245 .0005
3 .625 .6246 .0005
4 .625 .6246 .0004
5 .6252 .6248 .0004
6 .6252 .6246 .0004
7 .625 .6247 .0003
8 .625 .6245 .0005
9 .6253 .6248 .0005
10 .625 .6247 .0003
11 .6257 .6251 .0006
12 .625 .6245 .0005

Hs{Lord Ernest Hives - Chair}/L.H.Swindall.
  
  


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