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John Deere Tractors Discussion Forum
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JD H still leaking

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1951g

02-26-2007 08:31:32




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Ok, this is really getting frustrating. I have a leak on my H where the gasket goes in 2 places: upper water pipe where it bolts to the block and under radiator where it has 2 bolts that connect it there. Both places, the water beads after running the tractor for a while to get temp up to 190F. After it cools down, then it forms beads of water at these 2 places. I've taken the water pipe off 3 times already and tried the following with bars leak and black pepper in radiator:

paper gasket with copper coat on both sides after using a belt sander to flatten both surfaces.

paper gasket with RTV high temp silicone on both sides of gasket.

No matter what I try, once it cools down, it starts to leak.

I was thinking it might be a crack somewhere, but it seems to bead up at the gasket itself.

Any help with this one.

Thanks.

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1951g

02-26-2007 17:53:51




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 Re: JD H still leaking in reply to 1951g, 02-26-2007 08:31:32  
Ok, thanks for all of the feedback. The tractor was leaking before I sanded it in the same spots. I may have to tear it down and carry the block to the machine shop, but was hoping to avoid this. Thanks again.



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F-I-T

02-26-2007 19:01:01




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 Re: JD H still leaking in reply to 1951g, 02-26-2007 17:53:51  
I would try some in-the-tube-Permatex. I think you can get a better bead set with that, and it's pretty flexible over time. I just have not had good luck with RTV after the initial install. Like it or not, it has no tackiness, because it totaly cures, which breaks the bond. That's why you can peel it off.

You can also try making yourself some fresh gaskets out of gasket paper (find it at NAPA for example). Use a bit thicker paper than stock, or use two stock gaskets. Some of the OEM gasket thicknesses have gotten thinner as new vendors got added to the supply chain and scrimped on the print. Doesn't have to be much thicker to really make a difference.

I also favor truing those surfaces on a flat bed drag polisher like the you touch up head surfaces with, before they have to go whole hog on a mill (for aluminum) or a surface grinder (for steel and cast). A quick drag or two on a quality polishing bed will probably fix it.

Now if you want to try one more thing that won't hurt a bit, take the biggest picture frame or window glass you can find and rubber cement a nice good quality 60 or so grit sheet of silicon carbide fabric-backed, coated abrasive (I like 3M), add a bit of oil, and you can drag those surfaces true your self. If you can get a big piece of plate glass that was broken from a local glass shop, it's kind of handy to have stowed in the corner for such occasions.

Frank

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1951g

02-27-2007 11:08:57




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 Re: JD H still leaking in reply to F-I-T, 02-26-2007 19:01:01  
FIT,

Thanks for the info. I think I"ll try the glass tip you recommended before taking the block off and carrying to the machine shop.



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P Browning

02-26-2007 12:12:25




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 Re: JD H still leaking in reply to 1951g, 02-26-2007 08:31:32  
Take a good read from dds-inc -- I failed to really catch that you used a belt sander! Yipes!! Check those two pieces for flatness. You may have to run them by an engine rebuilder place where, in two minutes, they can make the surfaces level -- without which you won't have a fighting chance! (PatB)



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dds-inc

02-26-2007 10:53:35




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 Re: JD H still leaking in reply to 1951g, 02-26-2007 08:31:32  
A "belt sander to flatten both surfaces". I seriously question this action- more than likely, you have NOT made it flat, but rounded and just out of shape. 1/164th of an inch out is enough to make a surface leak...ESPECIALLY with paper gaskets.



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P Browning

02-26-2007 10:40:45




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 Re: JD H still leaking in reply to 1951g, 02-26-2007 08:31:32  
I have a recent post up on the JD-H Restoration Website that may be the solution you are seeking. Go to the site & under ITEMS OF INTEREST, select Item # 1A, UPDATES TO THE 2ND EDITION. Scroll down to page 3 of the document where you find a paragraph on Radiator Overhaul which includes a sealer I found so very easy to work with and appears to do the job -- Permatex Aviation Form-A-Gasket No. 3 Sealant. (PatB)

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Mike M

02-26-2007 10:16:11




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 Re: JD H still leaking in reply to 1951g, 02-26-2007 08:31:32  
Check really, really close for a crack. And also the belt sander may of not made them flat ,but could of rounded off the edges ? I have real good luck with a GASKET AND RTV tighten it up snug,let it cure a day then go back and tighten it up. Then refill the system and cross your fingers.Don't go over board on the RTV just a light coating. They do have some out now for use with antifreeze so I'd buy it.

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