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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Drum Cracked.
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<blockquote data-quote="Tom Gaynor" data-source="post: 9474" data-attributes="member: 4034"><p><strong>Gosh: just cracked another one...</strong></p><p></p><p>On Friday, the drive side drum (ribbed) parted right round the wide groove that takes the sprocket nuts. There was no indication that trouble was brewing until about a second before it brewed. CRUNCH! Whoops, wossat... No great damage done, and an hour later, having scrounged some 6 mm nuts and bolts from a car dealership and put the sprocket on the other drum, I rode the 70 miles home. I did have to promise that if I ever bought a Skoda, I'd buy it in Burrelton.</p><p></p><p>It was my second original rear drum letting go but I am pretty sure the cause was the slackening of the sprocket bolts. I was left with five rather battered 1/4" BSF setscrews and never a nut to be seen. Wonder how long it's been like that? I Fitted the sprocket 10,000 miles ago. Doesn't bear thinking about... Memo to self: use locknuts and/or Loctite next time, and use 10 bolts, not 5.</p><p>The new drum is in place. What a ****** of a job it is to take the drum off the hub. Eventually I made a screw-jack and jacked the bolts out, so successful that I re-used them. It also helped to fit a 3/8" drive 5/16" BSF socket to a 1/4" drive ratchet (smaller head). That way taking the ten nuts off, each clinging to the bolts to the last thread took only took an entire afternoon.</p><p>I had two new bolts, bought as spares when I replaced the other drum. Those dropped straight in. The original Vincent eccentric headed ones had to be driven in.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 9474, member: 4034"] [b]Gosh: just cracked another one...[/b] On Friday, the drive side drum (ribbed) parted right round the wide groove that takes the sprocket nuts. There was no indication that trouble was brewing until about a second before it brewed. CRUNCH! Whoops, wossat... No great damage done, and an hour later, having scrounged some 6 mm nuts and bolts from a car dealership and put the sprocket on the other drum, I rode the 70 miles home. I did have to promise that if I ever bought a Skoda, I'd buy it in Burrelton. It was my second original rear drum letting go but I am pretty sure the cause was the slackening of the sprocket bolts. I was left with five rather battered 1/4" BSF setscrews and never a nut to be seen. Wonder how long it's been like that? I Fitted the sprocket 10,000 miles ago. Doesn't bear thinking about... Memo to self: use locknuts and/or Loctite next time, and use 10 bolts, not 5. The new drum is in place. What a ****** of a job it is to take the drum off the hub. Eventually I made a screw-jack and jacked the bolts out, so successful that I re-used them. It also helped to fit a 3/8" drive 5/16" BSF socket to a 1/4" drive ratchet (smaller head). That way taking the ten nuts off, each clinging to the bolts to the last thread took only took an entire afternoon. I had two new bolts, bought as spares when I replaced the other drum. Those dropped straight in. The original Vincent eccentric headed ones had to be driven in. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Drum Cracked.
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