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).
Investigation into various troubles and failures experienced with the 20 HP starter motor.
| Identifier | ExFiles\Box 178\1\ img216 | |
| Date | 24th June 1927 | |
| HK.{Col. T. Harker - Sales} - Paris. Ps. Nice. Bombay. Pt. - Australia. Rv. - Madrid. H.{Arthur M. Hanbury - Head Complaints} - Sales. Barlow Mews. CWB. Sg.{Arthur F. Sidgreaves - MD} Whr.{Mr Wheeler} Er. - N. Mr. Evans - Lillie Hall. Mr. Reid - Glasgow. Mr. Bowring. D.O. - Mr. Walker. F/EP.{G. Eric Platford - Chief Quality Engineer} FWT. Mr. Shaw. Mr. Treyner. Mx.{John H Maddocks - Chief Proving Officer} Ey. EP.{G. Eric Platford - Chief Quality Engineer} DEPOT SHEET NO. Hm.{Capt. W. Hallam - Head Repairs}59. Origin of Information, HS{Lord Ernest Hives - Chair}2/LG24.6.27. 20 HP. STARTER MOTOR FAILURES. We have been investigating the various troubles which are experienced in the Test Dept. with the 20 HP starter motor. These can be placed in the following order :- 1. Sticking of pinion in disengaged position. 2. Pinion crashing on teeth of flywheel and not engaging. 3. Clutch slipping when not engaged. In investigating the first condition, we find that the failures are due to three causes, namely, cross-binding effect of the nut, climbing effect of the stop, and a slipping clutch. The sticking of the pinion is caused by a cross-binding effect taking place due to the necessary slackness of the nut on the thread. To overcome this it is necessary that the inner clutch plate D.51524 should float freely in the cover D.50672; otherwise it throws the whole unit out of truth and causes a binding. It is also necessary that the bronze washer D.57384 is free to revolve. Cont'd.{John DeLooze - Company Secretary} | ||