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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil pump OP30 removal
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<blockquote data-quote="Cyborg" data-source="post: 129572" data-attributes="member: 3426"><p>Yes that is the theory... just past compression on the rear cylinder. Who knows.... to get to the crank, the oil has to get past the quill, if the quill is a sloppy fit, the oil can escape there. So if pin is up, maybe less flow if quill is snug and centred properly (original # matching timing cover?) If there is slop in the quill and the crank pin is at the bottom, the quill would probably let air in and act as a siphon break, so pin location might not matter that much. I suppose best fix is to keep riding, second best is new pump. Next time you have a pump in your hand, turn it while looking at the ports on the “pressure” end. Once you see how quickly one port opens after the other closes, you get an idea of how little surface area is holding back the oil. Any scoring in that area (which is where most of it occurs) and there is a pathway for sumping.</p><p>The other thing about that small area in the pump that holds back the flow.... given the fact that replacing a pump can be a road laced with land mines, with all the reaming, slide hammering, pulling, twisting, cursing and lapping, that area can end up with damage or too much clearance. Back to square one...</p></blockquote><p></p>
[QUOTE="Cyborg, post: 129572, member: 3426"] Yes that is the theory... just past compression on the rear cylinder. Who knows.... to get to the crank, the oil has to get past the quill, if the quill is a sloppy fit, the oil can escape there. So if pin is up, maybe less flow if quill is snug and centred properly (original # matching timing cover?) If there is slop in the quill and the crank pin is at the bottom, the quill would probably let air in and act as a siphon break, so pin location might not matter that much. I suppose best fix is to keep riding, second best is new pump. Next time you have a pump in your hand, turn it while looking at the ports on the “pressure” end. Once you see how quickly one port opens after the other closes, you get an idea of how little surface area is holding back the oil. Any scoring in that area (which is where most of it occurs) and there is a pathway for sumping. The other thing about that small area in the pump that holds back the flow.... given the fact that replacing a pump can be a road laced with land mines, with all the reaming, slide hammering, pulling, twisting, cursing and lapping, that area can end up with damage or too much clearance. Back to square one... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil pump OP30 removal
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