JB weld and 4.0 head swap=rust? - JeepForum.com

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post #1 of 4 Old 11-14-2012, 04:40 PM Thread Starter
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1987 YJ Wrangler 
Join Date: May 2006
Posts: 115
JB weld and 4.0 head swap=rust?

I plugged my water jackets with JB Weld or Kwik Steel, I can't remember now. I removed my radiator line and this is what I found. It is like a rusty gritty material. It is somewhat sticks to a magnet. I'm thinking that JB weld that I used to plug the coolant passages is rusting and creating this? Anyone else with experience? I know everyone is using this stuff so I hope someone else can either confirm or deny this issue?

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nfisher50 is offline  
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post #2 of 4 Old 11-16-2012, 08:02 AM
Web Wheeler
1990 YJ Wrangler 
Join Date: Jan 2011
Location: Helena
Posts: 4,157
I used quik steel on mine I stuffed disolving foam packing peanuts in then the expoy on top. I think your problem is completely unrelated did you use distilled water when you filled your cooling system back up when you did the swap? I have been running my 4.0 head for 3.5 years now and I love it.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #3 of 4 Old 11-16-2012, 08:43 AM Thread Starter
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1987 YJ Wrangler 
Join Date: May 2006
Posts: 115
I did use distiller water. I also found heavy rust sediment in my block too. I m glad to hear others are not having this problem. I guess I'll flush it all out and start new.
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post #4 of 4 Old 11-16-2012, 10:22 AM
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1979 CJ7 
Join Date: Jun 2010
Location: nashville
Posts: 1,898
I've been running mine for about a year with jb weld and nothing like that yet. You could try asking in the cj forum I know a lot of them are running that setup maybe you could get some more opinions.
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