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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="1660bob" data-source="post: 25724" data-attributes="member: 366"><p>I once had a T160 tank (well we all make mistakes...) It was like the hull of the Titanic inside-so much rust that you could shake it and hear the rust flakes rattling about inside- i ground the worst out with a nut and bolt soup as above but the results were not very good.Next stop I bought a gallon of stiff (50%) phosphoric acid from my local paint stripping depot and in it went- it dissolved away the threads on the crappy zinc/pot metal pattern taps and they fell out overnight, followed by the acid. That stain is still all over the garage floor. The tank however was cleaned back to the metal leaving a dull grey surface and I mean CLEAN-It leaves good steel alone.There was a tide mark on the sides of the tank where the acid had been and it was possible to shine a torch inside and see right into the seam weld folds and all that could be seen was the pock marks in the metal where rust had been. More acid, proper plugs in the tap holes and a made up seal of rubber sheet /large washer/nut and bolt to properly seal the filler orifice then rotate tank every half hour to clean all of the inside.At 50% strength the acid works that fast-2 hours -done.The only problem was there seems to be a reaction when you empty and swill out the tank (water)as the surface inside immediately begins to RUST -in minutes! so i had to re-do it several times until i managed to stop the re-rusting by emptying a can of WD40 into the tank and sloshing it about instead of water-this seemed to stop the flash rusting and i swilled it with petrol, perfect. As a tester I fitted clear plastic bodied, paper element fuel filters in the lines to see if anything nasty ever came out of the tank in use-in thousands of miles there was never a speck of rust/crud ever on them. I have heard people say phosphoric acid can cause hydrogen embrittlement of the steel ?? I don`t know about that but my tank always seemed fine.... Best of luck, Bob</p></blockquote><p></p>
[QUOTE="1660bob, post: 25724, member: 366"] I once had a T160 tank (well we all make mistakes...) It was like the hull of the Titanic inside-so much rust that you could shake it and hear the rust flakes rattling about inside- i ground the worst out with a nut and bolt soup as above but the results were not very good.Next stop I bought a gallon of stiff (50%) phosphoric acid from my local paint stripping depot and in it went- it dissolved away the threads on the crappy zinc/pot metal pattern taps and they fell out overnight, followed by the acid. That stain is still all over the garage floor. The tank however was cleaned back to the metal leaving a dull grey surface and I mean CLEAN-It leaves good steel alone.There was a tide mark on the sides of the tank where the acid had been and it was possible to shine a torch inside and see right into the seam weld folds and all that could be seen was the pock marks in the metal where rust had been. More acid, proper plugs in the tap holes and a made up seal of rubber sheet /large washer/nut and bolt to properly seal the filler orifice then rotate tank every half hour to clean all of the inside.At 50% strength the acid works that fast-2 hours -done.The only problem was there seems to be a reaction when you empty and swill out the tank (water)as the surface inside immediately begins to RUST -in minutes! so i had to re-do it several times until i managed to stop the re-rusting by emptying a can of WD40 into the tank and sloshing it about instead of water-this seemed to stop the flash rusting and i swilled it with petrol, perfect. As a tester I fitted clear plastic bodied, paper element fuel filters in the lines to see if anything nasty ever came out of the tank in use-in thousands of miles there was never a speck of rust/crud ever on them. I have heard people say phosphoric acid can cause hydrogen embrittlement of the steel ?? I don`t know about that but my tank always seemed fine.... Best of luck, Bob [/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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