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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Liner/muff clearance
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<blockquote data-quote="oexing" data-source="post: 90932" data-attributes="member: 1493"><p>Greg, thanks for pointing me to the trouble spot with the seven through bolts around the gearbox. I did think about fitting small o-rings somehow but did not like the reduced seat for the bolt heads or nuts that might get squashed under loads. So instead I will do as I did on a ohc twin Horex for the head bolts, turn a flat taper of around 3-5 degrees to the underside of the nut or bolt head. First use a countersink to get a reasonable flat recess in the case and the flat taper, as shown with a felt pen scetch in the photo, will form its oil tight seat in the softer alu perfectly. Just apply a little grease for the seat before torquing down the bolt.</p><p> Some Loctite anaerobic sealants should be slow enough for fitting the cases close enough starting where the biggest gap from distortion may be. Never had troubles so far with cases - but recently did have to hacksaw an aluminium clutch centre off an adapter that I intended to fix by Loctite 648 on a fine left hand thread - but was too slow to thread it on to the stop, one millimeter too short, no chance . . .</p><p></p><p> Vic</p><p>[ATTACH=full]19521[/ATTACH][ATTACH=full]19522[/ATTACH][ATTACH=full]19523[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 90932, member: 1493"] Greg, thanks for pointing me to the trouble spot with the seven through bolts around the gearbox. I did think about fitting small o-rings somehow but did not like the reduced seat for the bolt heads or nuts that might get squashed under loads. So instead I will do as I did on a ohc twin Horex for the head bolts, turn a flat taper of around 3-5 degrees to the underside of the nut or bolt head. First use a countersink to get a reasonable flat recess in the case and the flat taper, as shown with a felt pen scetch in the photo, will form its oil tight seat in the softer alu perfectly. Just apply a little grease for the seat before torquing down the bolt. Some Loctite anaerobic sealants should be slow enough for fitting the cases close enough starting where the biggest gap from distortion may be. Never had troubles so far with cases - but recently did have to hacksaw an aluminium clutch centre off an adapter that I intended to fix by Loctite 648 on a fine left hand thread - but was too slow to thread it on to the stop, one millimeter too short, no chance . . . Vic [ATTACH=full]19521[/ATTACH][ATTACH=full]19522[/ATTACH][ATTACH=full]19523[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Liner/muff clearance
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