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8n Coolant Leak

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Mr. Natalie

01-27-2013 17:51:10

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I am in the process rebuilding a '47 8N, "Natalie". I have rebuilt the engine and in the process one of the exhaust manifold studs needed replacing. Go figure the one between #3 and #4, I think this stud is cursed. I put the radiator back on yesterday and noticed that there was some coolant on the floor this morning. It appears I have a leak from that notorious stud. Any ideas on how to fix this? I did put blue thread gunk on there when I put it in, possibly not tight enough? Also the freeze plug next to the drain plug in the block also has a small leak. Seeing as how I had the engine cleaned at a machine shop I did not install this. How would one go about repairing this? Thanks

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01-28-2013 15:06:05

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 Re: 8n Coolant Leak in reply to Mr. Natalie, 01-27-2013 17:51:10  
I always put JB weld over the freeze plugs then smooth it real nice before I paint. If you do real nice you can hardly notice the plug is even there once painted up. My local machine shop told me to do that years ago and I haven't had a problem yet. If you don't care about looks just let it go they will rust up and seal themselves after a while

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01-28-2013 05:42:03

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 Re: 8n Coolant Leak in reply to Mr. Natalie, 01-27-2013 17:51:10  
it's possible there was a lil erosion or imperfection at the core plug hole, and the rebuilder put the plug in dry. I usually put plugs in with a very thin smear of permatex or copper coat or even red rtv. just a thin smear mind you.. don't want anything breaking off and plugging a cooling passage..

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Den N Ms

01-27-2013 19:05:40

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 Re: 8n Coolant Leak in reply to Mr. Natalie, 01-27-2013 17:51:10  
Mr. Natalie,Get a builders cube or two and put in the radiator.or a small bottle of bars stop leak to seal things up.

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Mr. Natalie

01-27-2013 17:52:59

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 Re: 8n Coolant Leak in reply to Mr. Natalie, 01-27-2013 17:51:10  
Actually it is the stud between the exhaust and intake on the #4.

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