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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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<blockquote data-quote="oexing" data-source="post: 93638" data-attributes="member: 1493"><p>Norman,</p><p>my test should show up if there are any air bubbles in the return hose before the sump has been pumped to the low level. The actual problem seems to be that the scavenge side of the pump is not effective enough to drain the crank case, possibly because the extra oiling from the return line was increased above the amount the scavenge side can cope. I suspect an air leak in the scavenge side as cause of poor performance of the suction department. So I´d disconnect the return hose at the oil tank , extend it with a clear hose into some container to see if any bubbles show - that is , before the crank case is drained to the low level. Only then you´d expect to get air into the return line. And only when no air bubbles show at higher level than at low state we can assume the extra oiling to be excessive for the drain pump side. Or some other cause we did not yet think of . . . </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 93638, member: 1493"] Norman, my test should show up if there are any air bubbles in the return hose before the sump has been pumped to the low level. The actual problem seems to be that the scavenge side of the pump is not effective enough to drain the crank case, possibly because the extra oiling from the return line was increased above the amount the scavenge side can cope. I suspect an air leak in the scavenge side as cause of poor performance of the suction department. So I´d disconnect the return hose at the oil tank , extend it with a clear hose into some container to see if any bubbles show - that is , before the crank case is drained to the low level. Only then you´d expect to get air into the return line. And only when no air bubbles show at higher level than at low state we can assume the extra oiling to be excessive for the drain pump side. Or some other cause we did not yet think of . . . Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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