Keith Browning Posted June 2, 2017 Share Posted June 2, 2017 Had a used truck run through the shop this week that our sales dept wanted to sell. Had exhaust leaks from the fairly new exhaust manifolds. I got it apart and found the lower part of the front flange cyl #1 was cracked completely clean off the manifold. The cylinder head was heavily corroded around the lower stud leaving at least an 1/8' gap which explains the broken manifold. Weighing options it was suggested to try grinding it clean and building it back up using JB Weld. Seemed hokey to me but I gave it a try after reading the product specifications. I built up the cylinder head and carefully ground it flat checking it with a straight edge. Reassembled and verified the repair. Anyone ever try something like that? Obviously a new head is the best repair but its one of those heavily corroded trucks with more issues than the head. After having done this I believe I would have done this if it were my truck. Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted June 3, 2017 Share Posted June 3, 2017 Recently I had to use JB weld on a badly butchered exhaust manifold job too. One stud hole was drilled into a water jacket and another hole right into an exhaust port. Truthfully I don't know if that truck will ever be back so I can't speak for the longevity of the repair. For the stud hole into the water jacket I drilled a half inch hole, threaded it, ran a slotted cut off bolt coated in JB into the hole and ground it flush. Then I totally re drilled the M8 hole for the stud. The exhaust port hole got a big sert coated in JB. Quote Link to comment Share on other sites More sharing options...
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