Jb weld

J

JDakota

Member
Has anyone tried jb weld on a exhaust manifold crack? I have used it on heads with good results but am wondering about the heat of the exhaust manifold.
 
JB Weld can fix anything, well almost anything. The spec sheet for regular JB weld list max opperating temps at 500 degrees F. I feel that is too low for exhaust manifolds but any auto store has higher temperature exhaust "cement" but you must follow directions thoughly ie: cleaning, preperation,cure time etc. to get sastisfactory results. IMHO
 
Unless you are restoring your car exactly to the judging standard specs (and obviously a stove cement fix means you are NOT) then a new exhaust manifold is your best choice. At less than $100 bucks from most of the suppliers, the repo manifolds are a bargain, too. And best of all, no-droop at the rear exhaust port will mean that all your engine's cylinders will get the chance to breath evenly.
 
I used JB weld to close off the Air Injection tubes on a 76 Jeep CJ with a 301 years ago when I could not find plugs. Seemed to work ok for me. As for the longevity of the "fix" who knows
 
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