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Old 03-25-2018, 05:53 PM   #1
36tudordeluxe
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Default This can't be good?

Drained the radiator a couple of weeks ago and refilled with new coolant today and am now leaking fluid out of left side header flange. In my 221 had a erosion problem with the heads and was concerned may have happened in my 276 but when I removed thermostat housing and ran scope into head didn't see an an accumulation of crud as I did on the the 221. The engine never leaked water previously. Could head be leaking into one of my exhaust seats?
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Old 03-25-2018, 06:00 PM   #2
petehoovie
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Default Re: This can't be good?

Header mounting bolt too long and went through the jacket when tightened down....
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Old 03-25-2018, 06:12 PM   #3
36tudordeluxe
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Default Re: This can't be good?

Used recommended header bolt kit installed many years ago with no problem.
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Old 03-25-2018, 07:02 PM   #4
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Default Re: This can't be good?

Just checked dripping seems to have slowed down still have plenty of water in upper tank of radiator.
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Old 03-25-2018, 07:12 PM   #5
alanwoodieman
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Default Re: This can't be good?

as a test. remove the bolt in the offending area and see if it leaks worse. I have seen several of these bolts pushed thru the block into the water passage and for some reason most are the ones above the starter
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Old 03-25-2018, 07:42 PM   #6
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Default Re: This can't be good?

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as a test. remove the bolt in the offending area and see if it leaks worse. I have seen several of these bolts pushed thru the block into the water passage and for some reason most are the ones above the starter
Great idea, noticed already the bolt you describe was real loose, am wondering if loosening further wii make any difference? Will try anyway, maybe tightening it will stop it. Perhaps drawing completely and putting gob of JN weld on end of bolt and reinstalling.
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Old 03-25-2018, 07:44 PM   #7
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Default Re: This can't be good?

Don't put jd weld on it, you'll never ever get it out... EVER. Some high heat RTV would be fine.
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Old 03-25-2018, 08:10 PM   #8
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Default Re: This can't be good?

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Don't put jd weld on it, you'll never ever get it out... EVER. Some high heat RTV would be fine.
Much better idea!
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Old 03-25-2018, 08:13 PM   #9
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Default Re: This can't be good?

You might be okay with some "never seize". Which I would do anyways on exhaust bolts. Hope it stops the leak for ya.
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Old 03-25-2018, 08:44 PM   #10
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Default Re: This can't be good?

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You might be okay with some "never seize". Which I would do anyways on exhaust bolts. Hope it stops the leak for ya.
Do you mean to use in place of RTV?
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Old 03-25-2018, 09:17 PM   #11
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Default Re: This can't be good?

Either might work,and I only say might because this a internet analysis. Anti-seize helps to remove bolts later and due to the fact it's a liquid it will fill micro gaps. Anti-seize will fill little voids also and will allow you to remove bolts later. Maybe best of both worlds. Worth a shot. I would use anti-sieze first over RTV.
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Old 03-25-2018, 09:22 PM   #12
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Default Re: This can't be good?

I used permatex , number 2, I believe, the one that hardens and it seems to have worked.
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Old 03-25-2018, 10:00 PM   #13
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Default Re: This can't be good?

Blue loctite works really well for sealing leaks and you can still get the bolt out.
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Old 03-25-2018, 10:43 PM   #14
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Default Re: This can't be good?

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Blue loctite works really well for sealing leaks and you can still get the bolt out.
I like loctite, but it's purpose is to lock a bolt up, like a flywheel. Over time an exhaust bolt never needs help to be difficult to remove. Just me 2cents

If you want an old school fix get some indianhead permatex, autozone carrys it or did.

anti-seize covers both issues, maybe





.

Last edited by Tinker; 03-25-2018 at 10:52 PM.
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Old 03-26-2018, 12:56 AM   #15
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Default Re: This can't be good?

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You might be okay with some "never seize". Which I would do anyways on exhaust bolts. Hope it stops the leak for ya.
I agree. I had a leak around the threads on the radiator drain peacock and used “never seize” which stopped the leak.
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Old 03-26-2018, 01:26 AM   #16
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Default Re: This can't be good?

I see 3 different grades of NEVER SEIZE, regular grade, pure nickel and mariner's choice. Make any difference which one I use?
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Old 03-26-2018, 01:55 AM   #17
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Default Re: This can't be good?

Since you donīt have anything else then iron involved it shouldnīt matter, the other is for copperfree aplications and marine use with washout issues.
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Old 03-26-2018, 02:01 AM   #18
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Default Re: This can't be good?

I used the grade that came in a white can with red label. The product is gray in color sort of like plumber’s putty but more viscous. Both the male and female threads should be clean and dry for best results. It did a good job of sealing off the wallowed out threads in the bung on the radiator.
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Old 03-26-2018, 10:15 AM   #19
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Default Re: This can't be good?

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Since you donīt have anything else then iron involved it shouldnīt matter, the other is for copperfree aplications and marine use with washout issues.
The header bolts are stainless steel, should I get rid of them and use regular bolts?
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Old 03-26-2018, 10:28 AM   #20
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Default Re: This can't be good?

I would keep the stainless steel bolts. Don't use J-B Weld as others have cautioned, although with the heat of the exhaust, the J-B would probably fail eventually. I have had good luck with Loctite, 569 Thread Sealant.
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