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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Push rod tubes
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<blockquote data-quote="oexing" data-source="post: 130510" data-attributes="member: 1493"><p>To be open, I am a bit puzzled why there is all this trouble with sealing pushrod shrouds, not really rocket science I´d think. Provided there are no deep scratches on shrouds or case counter bores some standard o-rings should do . Some ovality should not be critical with o-rings but scratches are. No way can an o-ring reach down in deeper scratches for sealing there, so a bit of polishing out scratches may help. Misalignments don´t seem to be a problem with single o-rings down in the case but you have to check the upper part in the gland nut place so it will not do side loads on the lower o-ring 20x3 mm when tightening the nut. </p><p> I came up with sort of spherical washer on top of the shroud and a suitable Viton o-ring that gets squeezed by the gland nut for sealing there, no seal between top of shroud and head bore face, the spherical washer there is meant to prevent any side load reaching down to the bottom o-ring when faces of components are not parallel. </p><p></p><p> Vic</p><p>[ATTACH=full]38595[/ATTACH]</p><p></p><p>[ATTACH=full]38596[/ATTACH]</p><p></p><p>[ATTACH=full]38597[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 130510, member: 1493"] To be open, I am a bit puzzled why there is all this trouble with sealing pushrod shrouds, not really rocket science I´d think. Provided there are no deep scratches on shrouds or case counter bores some standard o-rings should do . Some ovality should not be critical with o-rings but scratches are. No way can an o-ring reach down in deeper scratches for sealing there, so a bit of polishing out scratches may help. Misalignments don´t seem to be a problem with single o-rings down in the case but you have to check the upper part in the gland nut place so it will not do side loads on the lower o-ring 20x3 mm when tightening the nut. I came up with sort of spherical washer on top of the shroud and a suitable Viton o-ring that gets squeezed by the gland nut for sealing there, no seal between top of shroud and head bore face, the spherical washer there is meant to prevent any side load reaching down to the bottom o-ring when faces of components are not parallel. Vic [ATTACH type="full"]38595[/ATTACH] [ATTACH type="full"]38596[/ATTACH] [ATTACH type="full"]38597[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Push rod tubes
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