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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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