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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Sprocket tag washer - A Series Burman gearbox
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<blockquote data-quote="Martyn Goodwin" data-source="post: 124652" data-attributes="member: 2433"><p>When working on the primary drive on my comet I use a sturdy straight edge ( a length of aluminium square rod approx 2" x 1") and hold it against the outer face of the primary case inner then measure the distance from the face of the straight edge to the face of the engine sprocket E215 and the face of the chainwheel on the clutch basket PR50-7X-1X. I have only ever needed to adjust the clutch basket by fitting suitable spacers in order to get the two sprockets to line up. As there 'should' be no movement between the clutch basket and the gearbox shaft you do not need hardened shims, and suitable washers will suffice.</p><p></p><p>The nut retaining the drive sprocket needs to be dead tight. Hint - you can obtain a Land Rover Hub Nut box spanner, 52mm which is a perfect fit for the nut , dirt cheap on ebay (example <a href="https://www.ebay.co.uk/itm/Hub-Nut-Box-Spanner-Land-Rover-Defender-Series-52mm-lock-tab-hubs-606435/392661520632?hash=item5b6c7350f8:g:NZUAAOSwmXteMVnw" target="_blank">https://www.ebay.co.uk/itm/Hub-Nut-Box-Spanner-Land-Rover-Defender-Series-52mm-lock-tab-hubs-606435/392661520632?hash=item5b6c7350f8:g:NZUAAOSwmXteMVnw</a> ) </p><p></p><p>The locking tab washer is also essential. I also use blue loctite on the thread of the nut. Why? </p><p></p><p>Well I have twice had the drive sprocket nut work slightly loose in use (it gets a lot of back and forth loading on it when in use) and once loosened it allows the drive sprocket to 'worry' on the output shaft, eventually destroying the dogs on the drive sprocket, you would swear that they had been machined away - its a blessing that the burman drive shaft is much harder than the drive sprocket, given you need a Kings ransom to replace the drive shaft, but not so the sprocket.</p><p></p><p>I have never tried to measure the alignment of the drive sprocket to the rear wheel. I use a laser on the rear chainwheel to ensure it runs straight to the drive sprocket on the gearbox. Now that could be a COVID project!</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 124652, member: 2433"] When working on the primary drive on my comet I use a sturdy straight edge ( a length of aluminium square rod approx 2" x 1") and hold it against the outer face of the primary case inner then measure the distance from the face of the straight edge to the face of the engine sprocket E215 and the face of the chainwheel on the clutch basket PR50-7X-1X. I have only ever needed to adjust the clutch basket by fitting suitable spacers in order to get the two sprockets to line up. As there 'should' be no movement between the clutch basket and the gearbox shaft you do not need hardened shims, and suitable washers will suffice. The nut retaining the drive sprocket needs to be dead tight. Hint - you can obtain a Land Rover Hub Nut box spanner, 52mm which is a perfect fit for the nut , dirt cheap on ebay (example [URL]https://www.ebay.co.uk/itm/Hub-Nut-Box-Spanner-Land-Rover-Defender-Series-52mm-lock-tab-hubs-606435/392661520632?hash=item5b6c7350f8:g:NZUAAOSwmXteMVnw[/URL] ) The locking tab washer is also essential. I also use blue loctite on the thread of the nut. Why? Well I have twice had the drive sprocket nut work slightly loose in use (it gets a lot of back and forth loading on it when in use) and once loosened it allows the drive sprocket to 'worry' on the output shaft, eventually destroying the dogs on the drive sprocket, you would swear that they had been machined away - its a blessing that the burman drive shaft is much harder than the drive sprocket, given you need a Kings ransom to replace the drive shaft, but not so the sprocket. I have never tried to measure the alignment of the drive sprocket to the rear wheel. I use a laser on the rear chainwheel to ensure it runs straight to the drive sprocket on the gearbox. Now that could be a COVID project! [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Sprocket tag washer - A Series Burman gearbox
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