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Old 01-08-2013, 06:38 AM   #1
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Cast Iron Rad Leak


Hey! Hope everyone is having a great new year so far!
My q is with regards to an old cast iron radiator in a guest br. I've noticed water running from out under It the other morning. I look and notice a slow drip in what looks like a joint between fins at the bottom. . Can this be fixed w/o having to drain the system and stand on a two ft long pipe wrench to break the rad loose? Maybe some high heat sealant?? The system is steam heat. Your suggestions are appreciated.
Best!!


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Old 01-08-2013, 07:32 AM   #2
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No, I dont see how anything is going to resist hot steam under pressure. You cant caulk a boat from the inside.

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Old 01-08-2013, 03:42 PM   #3
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No, I dont see how anything is going to resist hot steam under pressure. You cant caulk a boat from the inside.
My thoughts were that as well. But it's not steam that is coming out as I am able to touch the area where it is dripping. I was wondering maybe some boiler putty or some kind of dealer.
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Old 01-08-2013, 03:44 PM   #4
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Cast Iron Rad Leak


Any thing applied on the outside is not going to work.
Your seeing water because the steam is cooling.
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Old 01-08-2013, 03:56 PM   #5
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Cast Iron Rad Leak


Be very very careful. Take your wrenches and give the bolts(that hold the rad together) a slight snug and see if that stops it from leaking.
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Old 01-08-2013, 06:45 PM   #6
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Cast Iron Rad Leak


There are Architectural warehouses, that you can purchases reclaimed rad's, etc. that are pulled from old structures before razed. Here is one company I found through a Yahoo search http://www.oldcastironradiators.com/ Keep in mind, that piping is as old as the Rad, and since it rusts from the inside out, you may find that you are opening up a large can of worms, once you start working on it.
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Old 01-08-2013, 07:10 PM   #7
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Cast Iron Rad Leak


I remember researching the rads ( Hw) in our old house.

preferred method of repair is to take rads apart, clean all edges, and reassemble.

easier to buy a reclaimed (pressure tested of course) or have someone who does repair repair it. very easy to crack cast iron if not careful.
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Old 01-08-2013, 07:19 PM   #8
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Hey Beenthere, should he hit the nuts with PB Blaster for a couple of days prior to trying?
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Old 01-08-2013, 07:33 PM   #9
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Not really. Won't hurt.
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Old 01-08-2013, 07:39 PM   #10
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Thanks to everyone. I will try to tighten the nuts first...
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Old 01-08-2013, 07:50 PM   #11
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I dont get that answer at all. Not really, Wont Hurt.

I think he ought to wire wheel down through the 6,580 coats of paint that is always on old radiators, and try to get some PB-Blaster into the threads. Maybe even heat them up a little? Carefully, so no crack?
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Old 01-08-2013, 09:21 PM   #12
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I dont get that answer at all. Not really, Wont Hurt.

I think he ought to wire wheel down through the 6,580 coats of paint that is always on old radiators, and try to get some PB-Blaster into the threads. Maybe even heat them up a little? Carefully, so no crack?
Thats why I didn't tell him to really torque hard on them.
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Old 01-09-2013, 06:42 AM   #13
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Listen to gregzoll and replace it, your looking to get burnt or open up a can of worms that you won't be able to close.

Make sure you have all the wrench's, fittings and new radiator before your mess with it.

Or call a Pro.

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