flywheel-mounting-275-164m-175

I , Service-Information RMW Motorrad GmbH 1 Service Dept.Kl/Kr/Nab Motorcycles R60/6 US – R90S qs Technical Information Group: 11 – Engine Munich, Jan ’75 2/75 (164 M) e Re: Flywheel mounting /6 models Gentlemen: In order to improve the bolted connection between the crankshaft and flywheel, the thread has been enlarged from M 10 x 1.0 to M 11 x 1.5 providing ample safety against loosening also for our 900 cc engines. This change was made effective for series production as of chassis nos. BMWR 60/6 us – 4 920 662 R 75/6 us – 4 940 406 R 90/6 us – 4 960 790 R 90 S us – 4 980 304 DESCRIPTION TYPE PART NO. THREAD TIGHTENING TORQUE Crankshaft R60/6 11 21 1 262 443 R75/6-R90 S 11 21 1 262 450 Flywheel R90/6 11 22 1 262 070 R90 S Hex. Bolt R90/6 11 22 1 262 060 M11 x….:15. 72 X 3.6 ft.lb. In the following we inform you on the crankshaft flywheel mounting installed up to now at 600 cc, 750 cc and 900 cc engines. DESCRIPTION TYPE FART NO. THREAD TIGHTENINGTO RQUE Crankshaft R60/6 11 21 1 255 290 Flywheel R60/6 11 22 1 256 966 Hex. Bolt R60/6 11 22 0 016 756 M10 x 1 47 X 3.6 ft.lb. /0.866″ long Crankshaft t{/’3/6 11 21 1 259 856 (1,34″ pocket bore) Flywheel R75/fi 11 22 1 256 966 Hex. Bolt R75/6 11 22 1 257 796 M10 X 1 /1.26″ long 51 X 3,6 :ft, lb~j -2- Kenntnis genommen – Pris connaissance • Noted – Tornado nota – Preso conoscenza Ablage – Archives – File – Archivo Betriebsleitung ! Werkstall Oirect1ori i Atelier KD·Annahme I Gewahrl -Sachb. ! Teiledienst Betriebslettung ‘Werkstatt , Reception clrenIeIe I lnspecteur garanlie i Service pieces de·achees D1r8cl1on Atelier .-.• -~, ( ( S.I. 2/75 (164 M) e – 2 – DESCRIPTION TYPE PART NO. THREAD TIGHTENINGTO RQUE Crankshaft R90/6 11 21 1 259 856 (1.34″ pocket bore) R90 S Flywheel R90/6 11 22 1 256 966 R90 S Eex. Bolt R90/6 11 22 1 257 796 MlO x 1 R90 S /1. 26″ long 51 + 3.6 ft.lb. It is recommended when carrying out repair or service jobs to check whether the flywheel makes even contact with the crankshaft journal, and whether the bolts, threads, and plane surfaces of the crankshaft and flywheel are free from dirt and grease which is absolutely necessary. (CAUTION – in case the shaft sealing ring is greasy.) Fluid nut locks like Loctite should by no means be used. Please limit your part orders at present to really urgent cases as the quantit·ies of several parts on stock are still low. • •••• •S•i ncerely yours, BMWM OTORRADG mbH Milnchen ~i~J. Ettlich “Wta:::-r