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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).
Page from a 1934 Buick shop manual detailing the disassembly of a regulator body.

Identifier  ExFiles\Box 131\1\  scan0191
Date  1st January 1934
  
Page 26
BUICK 50-60-90 SHOP MANUAL, 1934

Fig. 25. Blowing Out Oil Chamber

Fig. 26. Blowing Out Water Chamber

and pry cover loose. This should be done carefully and at several points around cover to prevent distortion, see Fig. 29.

After cover has been removed, the nuts and washers used to hold the core in the body can be removed and the core taken from the regulator body, see Fig. 30.

Fig. 27. Removing Screws

Fig. 28. Removing Screws

When reassembling the core in the regulator body, care must be taken to clean all gasket surfaces. New gaskets should be used in all cases. The cover gasket should be shellacked on both sides before installing.

Fig. 29. Prying Cover Loose

Fig. 30. Removing Core
  
  


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