Maintenance Manual and Instruction Book, 16H, Big 4, 18 and ES2

Finally, screw the nut into its terminal. 99. PICK-UP. Examine the pick-up or high tension terminal (magneto end). See that the carbon brush moves freely in its holder, being careful not to stretch the brush spring unduly. While the pick-up is removed, clean the slip ring track and flanges by holding a soft cloth on the ring while the engine is slowly turned by hand. 100. SPARKING PLUG. Clean periodically by dismantling and re­ moving all carbon from the electrodes. Scrape inside of plug body clean of carbon, re-assemble and set gap at .015"— .025". ACCESSORIES. dynamo terminal " 'D ' ” and cable from cut-out and regulator terminal “ F ” to dynamo terminal “ F.” Clean with petrol, and if necessary ease the sides by lightly polishing on a smooth file. Replace brushes in their original positions. If the brushes are worn so that the flex is exposed on the running face, new brushes must be fitted. Brushes are pre-formed so that bedding to the commutator is unnecessary. A commutator .in good condition will be smooth and free from pits or burned spots. Clean the commutator with a petrol- moistened cloth. If this is ineffective, carefully polish with a strip of very fine glass paper while rotating the armature. 103. LUBRICATION. About every 4,000-5,000 miles add a few drops of good quality thin machine oil to the lubricator on the commutator end bracket. The bearing at the driving end is packed with grease which will last until it is necessary for the dynamo to undergo a complete overhaul. 104. CUT-OUT AND REGULATOR UNIT. This unit (Fig. 24) which is housed be­ neath the saddle, consists of the cut-out 102. DYNAMO BRUSHES. Test if brushes are sticking.

removed from the old cable and bend back the strands.

LIGHTING AND

101. DYNAMO—TO REMOVE AND REPLACE. Take off the connections from the dynamo terminals. Unscrew the hexagon headed nut from the driving end cover of the Magdyno. Slacken the two screws securing the band clip, and draw the dynamo out of its mounting. When replacing, slide the dynamo through the band clip so that fixing screw passes through its hole in the end cover and the gears mesh correctly. Tighten the end nut and the band clip fixing screws and remake the connections to the dynamo terminals. Make certain that !he dynamo is connected correctly, i.e., cable from cut-out and regulator terminal “ D ” to CO M M U TA TO R B R U SH

Fig. 23.

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