Engine misfiring issues related to spark plugs and a distributor fault.
| Identifier | ExFiles\Box 82\5\ scan0141 | |
| Date | 19th May 1937 | |
| 200a HOTEL DE FRANCE. CHATEAUROUX(French test region). Indre. France. Rm. {William Robotham - Chief Engineer} GWH {George W. Hancock - Head Chateauroux} /HFH {Hoppy F. Hamilton} /2/JAB. 19th May 1937. To. Rm. {William Robotham - Chief Engineer} e. {Mr Elliott - Chief Engineer} Rm {William Robotham - Chief Engineer} /GWH. {George W. Hancock - Head Chateauroux} S. B. IV. K.L.G. FLB.30X. PLUGS. We experienced considerable trouble during yesterday's run due to plug misfiring. No 6 plug terminal was sparking across a 3/4" gap to the induction pipe nut, and when wet, after having driven through puddles of water, the sparks ran down the porcelain insulation on both Nos. 4,5, and 6. These have been examined and the points have increased to the following sizes, from the original setting of .022", over a mileage of 5.070, since they were fitted. Nos. 1. 2. 3. 4. 5. 6. Gaps when removed........ .029" .029" .029" .031" .033" .034" The points of Nos. 4,5, and 6, have burnt to .025" and have since had no further trouble. DELCO-REMY DISTRIBUTOR. We also experienced a complete engine cut-out due to the spring retaining clip which holds the make and break rocker arm down on the bearing pin, having fallen off and jammed between the contact connecting strip and the case, causing a short. This has been closed up and replaced. Enclosed is a rough sketch showing the offending part in position. It appears that this has been moving back and fore with the rocker bush and has worn the groove in the brass pin provided for it, thus allowing itself to fall off due to inadequate spring tension; ----------------- Rm {William Robotham - Chief Engineer} /GWH {George W. Hancock - Head Chateauroux} /HFH. {Hoppy F. Hamilton} | ||
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).