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Old 05-24-2012, 05:47 AM
ctjahn ctjahn is offline
MC Fanatic
 
Join Date: Jul 2010
Boat: Own a 78 MC S&S
Location: Midwest
Posts: 607
JB Weld

I feel it is complete crap and should never be used but.... that being said.... I aways carry it in the toolbox for emergency repairs.

I did use it on a race engine for a season. As previously stated it is a temporary fix and should never be considered perminent. Also agree it is all in how it is applied. I stripped the paint, degreased, used brake clean (no water in the block), heated the surface and spread it wide around the crack I had....

I have a very good welder contact who can weld cast iron but I didnt want to warp the block or heads mid season. (The process uses a LOT of heat to properly weld and penetrate).

After the season was done it was properly fixed with a weld, block and head were decked and pressure tested. It was an SOB to get off...(the JB). I needed to use an angle grinder to remove it.

Your mileage may vary.
cj
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