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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
What the best way to a petrol tank?
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<blockquote data-quote="macvette" data-source="post: 25762" data-attributes="member: 262"><p>I derusted the tank on my 1972 Honda CB 500 using electrolysis. No acids and only removes rust, no metal. You can look the method up on t'internet but briefly you make an anode I used a steel coat hanger but make sure you remove the varnish from the hanger. Get a suitably sized plastic cap which fits your filler neck. Put a hole in the centre of the top to take screwed steel rod and drill a couple of vent holes in the top of the cap ( an aerosol top did it for me). Fix a length of coat hanger to the rod using a couple of steel nuts and the rod the cap with another couple of nuts and washers. Fiddle around with this assembly so <strong>that you can get it deep into the tank <strong>WITHOUT ANY OF IT TOUCHING THE TANK</strong> The plastic cap insulates the rod and hanger from the tank. Remove your fuel taps and plug the holes. Fill the tank with a solution of washing soda one tablespoon to the gallon. Refit your assembly making sure no metal part of it touches the tanlk. Connect the <strong>POSITIVE</strong> of a battery charger to the assembly and the <strong>NEGATIVE</strong> to a suitably bare metal part of the tank (rear mounting bracket?). Put the battery charger on trickle charge. A charger with an ammeter is best so that you can see the current draw.</strong></p><p><strong>Rust will collect on the coat hanger leaving sound tank metal behind. This method will not remove sound metal. You will need to clean the coat hanger and you might have to replace it as it is a sacrificial anode. This is not a quick method but is very safe as far as the tank is concerned. <strong>Whatever you do make sure you connect up as described</strong>. If you reverse polarity you <strong>WILL</strong> dissolve your tank. </strong></p><p><strong></strong></p><p><strong>As the tank derusts,the solution will go brown and the anode will collect an amazing amount of crud and you may have to change the solution after a couple of days. When your tank is clean, flush it thoroughly, empty it and dry it straight away because it will flash rust if not dried immediately. Now you can line it or not depending on your preference.</strong></p></blockquote><p></p>
[QUOTE="macvette, post: 25762, member: 262"] I derusted the tank on my 1972 Honda CB 500 using electrolysis. No acids and only removes rust, no metal. You can look the method up on t'internet but briefly you make an anode I used a steel coat hanger but make sure you remove the varnish from the hanger. Get a suitably sized plastic cap which fits your filler neck. Put a hole in the centre of the top to take screwed steel rod and drill a couple of vent holes in the top of the cap ( an aerosol top did it for me). Fix a length of coat hanger to the rod using a couple of steel nuts and the rod the cap with another couple of nuts and washers. Fiddle around with this assembly so [B]that you can get it deep into the tank [B]WITHOUT ANY OF IT TOUCHING THE TANK[/B] The plastic cap insulates the rod and hanger from the tank. Remove your fuel taps and plug the holes. Fill the tank with a solution of washing soda one tablespoon to the gallon. Refit your assembly making sure no metal part of it touches the tanlk. Connect the [B]POSITIVE[/B] of a battery charger to the assembly and the [B]NEGATIVE[/B] to a suitably bare metal part of the tank (rear mounting bracket?). Put the battery charger on trickle charge. A charger with an ammeter is best so that you can see the current draw. Rust will collect on the coat hanger leaving sound tank metal behind. This method will not remove sound metal. You will need to clean the coat hanger and you might have to replace it as it is a sacrificial anode. This is not a quick method but is very safe as far as the tank is concerned. [B]Whatever you do make sure you connect up as described[/B]. If you reverse polarity you [B]WILL[/B] dissolve your tank. As the tank derusts,the solution will go brown and the anode will collect an amazing amount of crud and you may have to change the solution after a couple of days. When your tank is clean, flush it thoroughly, empty it and dry it straight away because it will flash rust if not dried immediately. Now you can line it or not depending on your preference.[/B] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
What the best way to a petrol tank?
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