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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).
Test report detailing issues with chunking noises on car model 30-EX, related to clutch splines and gearbox slack.

Identifier  ExFiles\Box 124\3\  scan0367
Date  18th October 1935
  
-3-
Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}25/KW.18.10.35.

CAR    TEST    RESULT

(14) 30-EX    When clutch splines had .027 and axle pinion .210 backlash at 1.875 radius.    Bad chunking audible, also in top gear

(15) 30-EX    Original box, slack everywhere; rear wheels jacked up and chunking produced by use of hand brake. Applying a brake to the 2nd speed cone.    Noticeable improvement

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}
  
  


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