The studs break because the manifold expands and contracts with exhaust temps.Replace the manifold;make sure the stud holes are larger than the studs by almost 2 sizes-3/8 stud=1/2 hole.Buy Genuine CAT parts!All new studs,gaskets and manifold sections.DON"T weld them together=They HAVE to slip in their expansion joints. Next problem to consider is why is exhaust breaking the studs=is the manifold getting too hot for a reason?Such as over fueling/lean air mix,hard pulls lugging the engine,not downshifting,too rapid shut down with out allowing the engine to idle and cool down.Is there too much exhaust back pressure=possible clogged muffler? Or was it just the manifold being welded at the slip expansion joints and the stud holes too small? Mark
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Today's Featured Article - Running Beans in East Central Indiana - by The Red, John Fritz. Fall is my second favorite season behind the long days of summer. The calendar reads late September and it�s time to start running beans. This article is about my experiences helping my farm neighbor Ernie Swoveland, along with his grandsons Jeff and Craig Ring, with the soybean harvest in East Central Indiana for the 1999 season.
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