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).
Potential remedies for excessive oil consumption on chassis B.106.HK.
| Identifier | ExFiles\Box 146\5\ scan0071 | |
| Date | 22th November 1938 | |
| W/P. To Sr. from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. D/BP. 1245 abo 261 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}3/MH.{M. Huckerby}22.11.38. CHASSIS B.106.HK.{Col. T. Harker - Sales} We are in receipt of your memo Sr/VA.6/ET. 18.11.38 regarding excessive oil consumption on the above car. Before fitting the new cylinder block and pistons with which D/BP is going to supply you, we think it well worth while trying the following. (1) Fit a set of L section rings in the 2nd. compression grooves as standard practice on the 25/30. The number of these rings is E.61123, and in case you have none in stock we would like D/BP. to send you 8 such rings immediately. Where other things have failed we have found this type of ring a success. (2) Has the rocker shaft by mistake been put the wrong way round so that oil is flooding on to the valves ? In any case we think it worth while to fit new valve grommets to prove it is not oil getting down the valves as it seems rather odd that despite your previous fitment of rings etc. they have not given the desired result. (3) If the above fail and you cannot find anything further that is likely to cause the excessive consumption and you finally fit the new block and pistons, then we would advise you to open up the jet holes in the rods, as we have no experience of the new close clearance skirt pistons without the holes, particularly with new pistons. Whilst the unit is stripped it would also be worth while checking that the big end clearance on the crankpins is not excessive. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||