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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).
Cost of servicing standard tappets and considering the introduction of hydraulic tappets for the Phantom model.

Identifier  ExFiles\Box 17\6\  Scan337
Date  31th January 1935
  
x7060
W/N - Br.{T. E. Bellringer - Repair Manager}
Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}14/KW.31.1.35.

Silent Tappets on the Phantom.

Masservy impressed us with the cost of servicing the present standard tappets. Naturally the introduction of hydraulic tappet operation is a costly business. To obtain an idea as to whether it is worth bringing it in, we should like to have some indication of how much you spend annually on servicing Phantom tappets and valve gear for noise.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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