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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).
Noisy tappets in 3.5 & 4.25-Litre Bentley engines caused by the permanent bending and wear of push rods.

Identifier  ExFiles\Box 130\2\  scan0287
Date  18th November 1936
  
Copy. 1113.

To Hs.{Lord Ernest Hives - Chair}
RHC.{R. H. Coverley - Production Engineer}
E.{Mr Elliott - Chief Engineer}
By.{R.W. Bailey - Chief Engineer}
Rm.{William Robotham - Chief Engineer}

GWH{George W. Hancock - Head Chateauroux}3/R.18.11.36.

3 1/2 & 4 1/4-Litre Bentley Push Rods.

Complaints of noisy tappets are in many cases found to be due to the permanent bending of the push rods. It appears to be a growing trouble. There are also cases of bad wear which has taken place on the bottom pad of the push rods. A large pip is formed corresponding to the hole drilled in the tappet cup.

GWH.{George W. Hancock - Head Chateauroux}
  
  


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