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General Chat (Vincent Related)
Copper Inspection Cap washers (ET160)
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<blockquote data-quote="oexing" data-source="post: 177067" data-attributes="member: 1493"><p>So what is an alternative to o-rings in these applications ? The copper rings are poor, same with fibre seals, even on drain screws. Best design is something with o-rings under the head and a hard shoulder or outer ring for seating the part and having a definite squash on the o-rings. So then no excessive torque is required for a good seal which keeps oil inside. And no seal will spread from lasting preload so the screw will rattle loose and fall off. Some time ago I had a drain screw from a Ford Capri sump to look at, no fibre seal or copper, no - an o-ring in a recess and a shoulder to sit on when tightened. So no creeping seals to squash and get loose.</p><p> Instead of machining the caps for keeping o-rings in place - and not reducing space inside for the rockers better have some simple small alu rings - or copper - to contain the o-rings at exact squash and some light torque, no need for much of it, almost just finger-tight. Even when the cap has come somewhat loose - unlikely - the elastic o-ring will keep it from falling off with half a millimeter preload. As reported, you will not find Japanese inspection caps with copper or fibre seals, too risky to fall off - and poor sealing properties too. </p><p> Dowty got into this business , hydraulics maybe, by producing sealing washers with sort of o-ring moulded into special washers, so these will take high oil pressures in a safe component. You will not find fibre seals in hydraulics, totally unsafe at high pressures. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 177067, member: 1493"] So what is an alternative to o-rings in these applications ? The copper rings are poor, same with fibre seals, even on drain screws. Best design is something with o-rings under the head and a hard shoulder or outer ring for seating the part and having a definite squash on the o-rings. So then no excessive torque is required for a good seal which keeps oil inside. And no seal will spread from lasting preload so the screw will rattle loose and fall off. Some time ago I had a drain screw from a Ford Capri sump to look at, no fibre seal or copper, no - an o-ring in a recess and a shoulder to sit on when tightened. So no creeping seals to squash and get loose. Instead of machining the caps for keeping o-rings in place - and not reducing space inside for the rockers better have some simple small alu rings - or copper - to contain the o-rings at exact squash and some light torque, no need for much of it, almost just finger-tight. Even when the cap has come somewhat loose - unlikely - the elastic o-ring will keep it from falling off with half a millimeter preload. As reported, you will not find Japanese inspection caps with copper or fibre seals, too risky to fall off - and poor sealing properties too. Dowty got into this business , hydraulics maybe, by producing sealing washers with sort of o-ring moulded into special washers, so these will take high oil pressures in a safe component. You will not find fibre seals in hydraulics, totally unsafe at high pressures. Vic [/QUOTE]
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Copper Inspection Cap washers (ET160)
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