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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
VOC Spares Company Ethanol Proof Ewarts Plunger
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<blockquote data-quote="Rob H" data-source="post: 139658" data-attributes="member: 1913"><p>Quick update and something to watch out for on the new ethanol proof plungers. I have just put the bike back on the road and she who shall be obeyed complained of the smell of petrol in the garage and I must admit I did eventually agree somewhat. When I disconnected the fuel lines to check the carbs I noticed that there was a very slight drip from one of the taps, it was not fully shutting off. On removal of the plunger it was noticed that the edge of the seal had been catching on the lower drilled opening in the tap and the action of closing the plunger had took a chunk out of it. The issue was the same on both taps although not as bad on the right hand side as that one has been rarely used as it is kept for reserve only</p><p></p><p>The taps are both standard original ewarts not modern copies. On close inspection it is seen that the taps are designed so that the plunger only blocks off the lower "out" hole, I guess was that back in the day it was designed that way so the corks would be constantly wet and not dry out. </p><p></p><p>The edge of the seal on the plunger is a sharp 90 degree angle so have tried to put a slight chamfer on this to prevent the catching. As only the one hole needs to be blocked I have rotated the seal on the plunger 180 deg to reuse. Hopefully this will solve the issue for now</p></blockquote><p></p>
[QUOTE="Rob H, post: 139658, member: 1913"] Quick update and something to watch out for on the new ethanol proof plungers. I have just put the bike back on the road and she who shall be obeyed complained of the smell of petrol in the garage and I must admit I did eventually agree somewhat. When I disconnected the fuel lines to check the carbs I noticed that there was a very slight drip from one of the taps, it was not fully shutting off. On removal of the plunger it was noticed that the edge of the seal had been catching on the lower drilled opening in the tap and the action of closing the plunger had took a chunk out of it. The issue was the same on both taps although not as bad on the right hand side as that one has been rarely used as it is kept for reserve only The taps are both standard original ewarts not modern copies. On close inspection it is seen that the taps are designed so that the plunger only blocks off the lower "out" hole, I guess was that back in the day it was designed that way so the corks would be constantly wet and not dry out. The edge of the seal on the plunger is a sharp 90 degree angle so have tried to put a slight chamfer on this to prevent the catching. As only the one hole needs to be blocked I have rotated the seal on the plunger 180 deg to reuse. Hopefully this will solve the issue for now [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
VOC Spares Company Ethanol Proof Ewarts Plunger
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