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).
List of engine lubrication modifications for different vehicle series.
| Identifier | ExFiles\Box 89\4\ scan0278 | |
| Date | 3rd March 1938 | |
| -2- out in the case of owners who are known to be hard drivers. This modification consists of:- 1st. in G.{Mr Griffiths - Chief Accountant / Mr Gnapp} - 192nd. in J.{Mr Johnson W.M.} series. 1. Large oil pump. 2. Up-to-date grooving of inter mains. 3. Drilling of extra and opposite .2187 hole in main crank journals. 4. Drilling extra and opposite .125 dia. hole in each crankpin. 193rd. in J.{Mr Johnson W.M.} to 1st. in K.{Mr Kilner} series. 1. 3 and 4. 1st. in K.{Mr Kilner} to 33rd. in K.{Mr Kilner} series. 3 and 4. 33rd. in K.{Mr Kilner} to 175th in K.{Mr Kilner} series. 4. From 175th. in K.{Mr Kilner} onwards 7.8.37 units are up-to-date. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||