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Fixing 420 Radiator

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Chris in ct.

02-20-2000 11:17:26




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I have a few pin hole leaks on the radiator of my 420. Does anyone have any " do it yourself " fix for this old radiator. the leaks are not where the fins are....there more on the top of the brass "holding area". Also has a small leak where the seams join. I'm a pretty good plumber so soldering it is something I would tackle....I just need to know what kind of solder to use and if I use a type of flux or muric acid for a cleaner. Just looking for some advice. Chris

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Chuck

02-20-2000 13:25:12




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 Re: Fixing 420 Radiator in reply to Chris in ct., 02-20-2000 11:17:26  
have had numerous problems such as you are referring to and had no success in repairing. Once you try to clean the tubes, they seem to dissentigrate. Before you disturb, I've found that radiator sealer such as bars stop or prestone stop might help. A radiator is about $200 and your best bet if you want to keep the tractor.



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clooney

02-20-2000 13:17:29




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 Re: Fixing 420 Radiator in reply to Chris in ct., 02-20-2000 11:17:26  
Chris, first plug the rad. and put a (little) pressure in it, then mark and write down where ALL the leaks are. Then clean all the mud, oil, & paint from the areas marked, then use a "scotch brite" or steel wool to clean the areas to a bright shine, then use "solder flux & lead solder" or an "acid core solder" try to find some of the old solder that was made of lead ( the new "safe" solder is hard to work with). Use a small flame from a tourch or a BIG solder gun, you can use a solder gun in the thin & hard to reach places....Good luck

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Chris in Ct.

02-21-2000 07:03:10




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 Re: Re: Fixing 420 Radiator in reply to clooney, 02-20-2000 13:17:29  
Thank you for the advice....you said small torch....kind of like a butane torch with a pencil tip? chris



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clooney

02-21-2000 16:34:28




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 Re: Re: Re: Fixing 420 Radiator in reply to Chris in Ct., 02-21-2000 07:03:10  
Chris, I usually use my welding tourch with a very small tip. You can use a propane torch or butane, just keep the heat low so you don,t burn holes in the THIN THIN THIN metal that is left.



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Paul

02-20-2000 19:42:52




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 Re: Re: Fixing 420 Radiator in reply to clooney, 02-20-2000 13:17:29  
A safe way to pressurize the radiator - Cut a bicycle innertube (making one long flexible tube with a valve stem on the side). Hose clamp the two ends to the upper and lower radiator outlets. Air it up until you think it's going to burst. Use soapy water in a spray bottle (or Windex if Mother isn't looking) to find the air leaks. I've fixed a few and ruined a few. Good luck!



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