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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Push rod tubes
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<blockquote data-quote="Martyn Goodwin" data-source="post: 124752" data-attributes="member: 2433"><p>For any seal to work THREE things are essential</p><p>1. The OUTER surface must be smooth and free of any burs or distortion</p><p>2. The INNER surface must also be free of any burs or distortion</p><p>3. The 'seal' must be uniformly deformed and in full contact with BOTH the inner and outer surfaces.</p><p></p><ul> <li data-xf-list-type="ul">It is reasonable to assume that the machining in the crankcase for he pushrod tubes is smooth and undistorted.</li> <li data-xf-list-type="ul">It is unreasonable to assume that the pushrod tubes are undistorted, especially if anyone has ever applied any form of clamp trying to remove them.</li> </ul><p>So, irrespective of the type of seal the pushrod tubes must be perfectly round, free of burs or distortion. Mine leaked for years but they looked OK to the eye.</p><p></p><p>I replaced them with new tubes (ET46) and the leak was cured. I do acknowledge that at GBP20 each it would have been cheaper to purchase oil.</p><p></p><p>As to pulling the head, why not? With COVID restrictions here in Oz were not allowed to go pleasure riding anyway.</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 124752, member: 2433"] For any seal to work THREE things are essential 1. The OUTER surface must be smooth and free of any burs or distortion 2. The INNER surface must also be free of any burs or distortion 3. The 'seal' must be uniformly deformed and in full contact with BOTH the inner and outer surfaces. [LIST] [*]It is reasonable to assume that the machining in the crankcase for he pushrod tubes is smooth and undistorted. [*]It is unreasonable to assume that the pushrod tubes are undistorted, especially if anyone has ever applied any form of clamp trying to remove them. [/LIST] So, irrespective of the type of seal the pushrod tubes must be perfectly round, free of burs or distortion. Mine leaked for years but they looked OK to the eye. I replaced them with new tubes (ET46) and the leak was cured. I do acknowledge that at GBP20 each it would have been cheaper to purchase oil. As to pulling the head, why not? With COVID restrictions here in Oz were not allowed to go pleasure riding anyway. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Push rod tubes
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