Tim Wolfe Posted January 24, 2020 Share Posted January 24, 2020 Has anyone ever used JB Weld to seal a crack on an intake manifold. My 1930 Chrysler with a 218.6 cu. in. engine has been welded and cracked again. Was welded with nickel rod. Any spares out there? Link to comment Share on other sites More sharing options...
Guest Posted January 24, 2020 Share Posted January 24, 2020 I have stitched cracks in an engine block myself and wonder if one could stitch a manifold??? Link to comment Share on other sites More sharing options...
Tim Wolfe Posted January 25, 2020 Author Share Posted January 25, 2020 We stitched heavy cast iron parts where I worked, manifolds are to thin to stitch. Contacted JB Weld and they said to try their JB Tank seal on it. Worth a try! The car is an all original model 70 2 door Brougham 1930. Will post the results.. In the meantime, anyone have a spare they'll part with? Early production 218.6 engine with a downdraft carburetor. Link to comment Share on other sites More sharing options...
keiser31 Posted January 25, 2020 Share Posted January 25, 2020 (edited) 21 hours ago, Tim Wolfe said: Has anyone ever used JB Weld to seal a crack on an intake manifold. My 1930 Chrysler with a 218.6 cu. in. engine has been welded and cracked again. Was welded with nickel rod. Any spares out there? Can you provide a photo of your manifold? I have a couple, but not sure if I have the one you need. Edited January 25, 2020 by keiser31 (see edit history) Link to comment Share on other sites More sharing options...
Gunsmoke Posted January 25, 2020 Share Posted January 25, 2020 It would be interesting to see just where it cracked. Intakes are not subject to the same stresses as exhausts and are most likely to crack due to bolting up issues, and as such, a re-welded one might crack in same spot if alignment is off. Link to comment Share on other sites More sharing options...
Tim Wolfe Posted January 25, 2020 Author Share Posted January 25, 2020 I had a crack years ago and I had it welded then. When the manifolds were taken off I had a new exhaust manifold cast because the original had been welded poorly. The manifolds were mated up by an engine builder who is well known. Years later it cracked again and a weld shop welded it. I installed it and before I had a chance to torque the nuts, I heard it crack. So yes it must be out of alignment. ( welder clamped it to a heavy table before he welded it ) I'll check it out before I install it again before it is tightened down ( hindsight is great isn't it?) Link to comment Share on other sites More sharing options...
Gunsmoke Posted January 25, 2020 Share Posted January 25, 2020 These combination manifolds, where intake and exhaust are tightly bolted together before mounting on block need special care to ensure all the mounting flanges lie in perfect alignment. Changes to the mating gasket (too thick/too thin) can cause alignment issues. Best practice is to assemble them tightly off the car and then set on a true flat surface and check for any signs of out of alignment. New manifold gaskets can allow for small alignment issue, but not much. Link to comment Share on other sites More sharing options...
viv w Posted January 25, 2020 Share Posted January 25, 2020 You need to assemble the intake and exhaust manifolds together with a new gasket and then get a machine shop to clean them up on a surface grinder, so that all the exhaust and inlet ports are in alignment, or they will continue to crack. Any machine shop that skims cylinder heads should be able to do this for you. 1 Link to comment Share on other sites More sharing options...
Tim Wolfe Posted January 25, 2020 Author Share Posted January 25, 2020 Manifolds are off the engine, intake going to weld shop Monday. I have new gaskets and will have an engine rebuilder machine them together before they are installed again. Car hasn't been on the road since 2002, it's about time! Thanks , for all the input and advise. My other car will be at Auburn, Ind. show in May and Keeneland Concours later in the year. Just want to drive the Brougham again. Link to comment Share on other sites More sharing options...
keiser31 Posted January 25, 2020 Share Posted January 25, 2020 Can we get a peek at the whole car, Tim? Link to comment Share on other sites More sharing options...
Tim Wolfe Posted January 26, 2020 Author Share Posted January 26, 2020 We stitched heavy cast iron parts where I worked, manifolds are to thin to stitch. Contacted JB Weld and they said to try their JB Tank seal on it. Worth a try! The car is an all original model 70 2 door Brougham 1930. Will post the results.. In the meantime, anyone have a spare they'll part with? Early production 218.6 engine with a downdraft carburetor. 2 Link to comment Share on other sites More sharing options...
Tim Wolfe Posted January 26, 2020 Author Share Posted January 26, 2020 The coupe before we restored it and after it was restored. The Brougham still looks like the photo. 1 Link to comment Share on other sites More sharing options...
ia-k Posted January 27, 2020 Share Posted January 27, 2020 With combination manifolds (like my '51 Plymouth) bolt them together loosely then put them on the engine. After you have torqued the manifolds to the engine block tighten the bolts that hold the manifolds together. Reduces the stress of the manifold being square to the block instead of try to be square to each other. Went through 2 exhaust manifolds before being told this and the the last one has lasted 40+ years. Link to comment Share on other sites More sharing options...
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