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).
Breakdown of labour hours for engine maintenance procedures including top and bottom decarbonisation.
| Identifier | ExFiles\Box 107\2\ scan0124 | |
| Date | 23th May 1938 | |
| - 3 - Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}5/G.23.5.38. There has been recurrent complaints after the above method has been carried out. If a modification B. is carried out at the same time as a bottom decarburisation, the total labour hours are 100. (40½ hours extra). Average Bottom decarburisation 59½ hours. If a modification C. is carried out with a bottom decarburisation (.i.e. remove engine from the frame), the total average labour hours are 161½ There have been no recurrent cases during 12 months with this modification. R.10 Top decarburisation ... labour hours 24½ 15½ skilled 9 semi. Nipping up of bearings in conjunction 46¾ hrs. 22 skilled 24¾ semi. Total 71¼ Bottom decarburisation .. labour hours 59½ 36 skilled 23½ semi. Nipping up of bearing .. labour hours 40½ Total 100 52 skilled 48 semi Bottom decarburisation and modification C. 106½ skilled 55 semi Total labour hours 161½ Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||