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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).
Standardisation of parts document for an Overdrive Gearbox.

Identifier  ExFiles\Box 171\5\  img052
Date  8th March 1938
  
COMPLETED 22.9.38.
RR 785B (10M) (45689) 19/10/37 C.E.Co.
BENTLEY STANDARDISATION OF PARTS
Description: OVERDRIVE GEARBOX. US
Purpose: To reduce engine revs and increase bearing life. Also to add a selling feature.
Date Issued: 8.3.38.
Sheet No. S.8.
Drg. No.
L.O.P.S.
Brief Report and Remarks:
Has run 7,000 miles on 6.B.IV. in France and will have completed 15,000 miles before cars reach customers.
A standard box has run 100 hours full torque on dynamometer on 3rd. gear using brass bushes.
When recommended for Introduction: 101 in M
Old Parts: Material £8.10.10, Labour £9.4.0, Burden £16.2.0, Total £33.16.10.
New Parts: Material £8.12.3, Labour £9.6.10, Burden £16.6.11, Total £34.6.0.
Increase in Cost £0.9.2.
Handwritten: ARH 11/5/38
Production Position and Comments: Cost of Tools £134.0.0d.
Introduction of overdrive gearbox at 1st. chassis in 'M' series involves scrapping of existing parts value £8/0.13.8d. this surplus being brought about by the fact that all material for Standard or Non-Overdrive type Gearbox was originally issued for first half of 'M' series.
The Overdrive gearbox increases Factory cost of chassis by 9/2d. and involves a tool cost of £134.0.0d.
RHC.{R. H. Coverley - Production Engineer}
Authorisation to Proceed.
Introduce on the 1 Chassis in M Series.
Signature Sg.{Arthur F. Sidgreaves - MD} Date: 20/9/38
Signature Hs.{Lord Ernest Hives - Chair} Date: 20/9/38
  
  


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