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madmathew

2015 6.2L broken exhaust manifold studs.

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My lower radiator hose developed a leak and I'm out of town so I got a clamp to put on it and while I putting that on I noticed that the front left exhaust manifold stud is broken and half of it and the nut are still laying stuck between the manifold and heat shield.   I still am covered under the drivetrain warranty,  I wonder if this will be covered?   Its a PITA job to do.   If I end up having to fix it myself I'm putting headers on it.

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How much of the stud is still there in the head?

If there's enough left, tighten two nuts against each other on the stud and loosen it like a bolt. Shouldn't be that hard to do.

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Weld a nut head to the reaming nut and try and loosen it.  But if it's under powertrain warranty the easiest would be to take it in and let the dealer fix it. 

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And you want to get it fixed, as broken manifold bolts can result in an exhaust leak and the truck to use more fuel.

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Its hit an miss if the dealer will cover it under powertrain but I'm guessing no. Usually it's anything that oil touches in the engine, trans or axles.

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Maybe it's an emission warranty. If it leaks exhaust other than certified,  it could be covered. In Calif. It used to be 5 year, 50,000 mile. So a broken stud should be covered, if there are no mods that might void a Warranty .

Look for your vehicles warranty coverages.

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Being a 5.3 or 6.2 makes no differences when the parts are still the same. They both can break. It's hit and miss from what I see.

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The studs have been breaking off since the introduction of the ls motor. 4.8,5.3,6.0,6.2, doesn’t matter. I don’t have a good reason why but I have seen many of them come thru the shop.  I think it is inevitable with these motors just a matter of time. 

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1 hour ago, 15slvrDbl said:

The studs have been breaking off since the introduction of the ls motor. 4.8,5.3,6.0,6.2, doesn’t matter. I don’t have a good reason why but I have seen many of them come thru the shop.  I think it is inevitable with these motors just a matter of time. 

Dissimilar metals causes corrosion which weakens metal.

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1 hour ago, 15slvrDbl said:

The studs have been breaking off since the introduction of the ls motor. 4.8,5.3,6.0,6.2, doesn’t matter. I don’t have a good reason why but I have seen many of them come thru the shop.  I think it is inevitable with these motors just a matter of time. 

Yeah but that has no impact on lt motors.

 

it’s a completely new engine, they simply used the same displacement to save on tooling

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You would think since ‘99 they would have looked into different studs. But maybe since they usually hold up until after warranty they just don’t care. 

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Yeah but that has no impact on lt motors.
 
it’s a completely new engine, they simply used the same displacement to save on tooling
We need@Paintor to come and post the same bulletin about lifter defects in LS motors.

And to continue his conspiracy theory regarding a general's wife and a suave alien at Area 51.

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