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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).
The persistent 'running after switching off' problem on a 25/30 car, leading to the decision to fit a completely new engine unit.

Identifier  ExFiles\Box 107\1\  scan0430
Date  13th January 1937
  
560.

Sg.{Arthur F. Sidgreaves - MD} from Rm.{William Robotham - Chief Engineer}

Rm{William Robotham - Chief Engineer}7/R.13.1.37.

Your 25/30 Car.
Sg{Arthur F. Sidgreaves - MD}18/E11.1.37.

The running after switching off problem on this car has proved to be extraordinarily difficult to eradicate. We have changed the camshaft, and, in fact, almost every other portion of the engine, but the trouble has still persisted. We are, therefore, fitting a completely new unit to your car, and expect to be able to deliver it to London by Thursday evening, the 14th.

Rm.{William Robotham - Chief Engineer}
  
  


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