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Causes for cracked exhaust manifolds

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Old 02-08-2012, 09:15 PM   #1
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Default Causes for cracked exhaust manifolds

The drivers side exhaust manifold on my 88 bronco is cracked it two places so what is causing them to crack,I am thinking I might drop the y pipe and knock out the convertors if plugged convertors are one of the causes of cracking. Either I was lucky but never had a exhaust manifold crack on me,this one was cracked when I got it.
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Old 02-08-2012, 09:30 PM   #2
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Loose or bad hangers, the manifold is supporting the ypipe which it should not be, causing it to crack, the ypipe needs to be supported so the manifold dont take the stress of the ypipe.
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Old 02-08-2012, 09:57 PM   #3
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not to mention the cheap material there made from and the constant strain from heating and cooling of the material, along with the strain from the y pipe
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Old 02-08-2012, 10:00 PM   #4
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Thats why its important to support the ypipe.
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Old 02-08-2012, 10:08 PM   #5
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It had no exhaust after the convertor and who knows for how long,I am about ready to put a muffler and tailpipe on it and did not want to hear a leak at the manifolds. Its cracked right here the pipe bolts on so the no support explains it,the reason I never had problems years ago is no weight from the convertors and I better check the pass side.

Last edited by Junkyardjeff; 02-08-2012 at 10:09 PM. Reason: added more words
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Old 02-08-2012, 10:13 PM   #6
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ebay has cheap manifolds, just make sure the ypipe is supported or the stress is taken off the manifold.
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Old 02-08-2012, 11:10 PM   #7
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I had a good manifold in stock,it looks like its a 1980 casting number and is the same as the one I have that came from a mid 80s truck.
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