Dodge Cares, Why are the manifold bolts breaking?
#32
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Back in the day, when the 3.3 and 3.8L engines came out, there was a HUGE rash of broken rocker shaft towers. Many of them wouldn't go 30K without snapping one off. They would break along a fine line, similar to the "cracked" method of rod bearing caps. After doing countless numbers of these in such a short time, we thought we'd experiment. The head that DIDN'T break ever, was on the same side the grounds attached to the engine. We installed redundant grounds on a handful of ones that employees and friends owned on the side that the heads were breaking. They never broke again. Chalked it up to electrolysis, electrical pitting whatever. The ground paths back to chassis were not ample enough to handle the returns. Cylinder head water jackets are often very close to the manifold thread holes.... Coolant would conduct and disperse these in other directions, which of course most of you know is going to be the path of least resistance.
But I'm no engineer,.....
But I'm no engineer,.....
Last edited by TNtech; 12-16-2017 at 11:04 AM.
#34
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Interesting theory about the Long Tube & Shorty headers reducing temps near the bolts.
I'd like to see a test where you start the truck let it warm up to operating temps at idle and measure the temp with a flir thermal camera.
If someone would do that we could then compare it to a stock manifold with the same procedure.
Of course its always possible that those conditions wouldn't generate enough heat to make a measurable difference.
I'd like to see a test where you start the truck let it warm up to operating temps at idle and measure the temp with a flir thermal camera.
If someone would do that we could then compare it to a stock manifold with the same procedure.
Of course its always possible that those conditions wouldn't generate enough heat to make a measurable difference.
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blue70ss (02-24-2020)
#35
#36
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I have a 2012 5.7 Hemi. At just over 100K miles it had 4 exhaust manifold bolt failures. It is clear that Dodge Ram has no engineers working for them. Bolt stress in dissimilar metals is 1st year engineering at most. I can live with wear out of brakes, exhaust systems, ball joints and other parts that move or are normal maintenance items. I can't and won't tolerate crappy engineering that results in expensive failures like these manifold bolts.This failure should never happen, period. It turned out that the exhaust headers were also warped and needed replacing. Utterly unacceptable.
This failure is so serious that my first Dodge Ram is also going to be my last. Later this year I'm going to buy either a Ford F150 or a GM Silverado rather than an under or zero engineered crappy Dodge product.
This failure is so serious that my first Dodge Ram is also going to be my last. Later this year I'm going to buy either a Ford F150 or a GM Silverado rather than an under or zero engineered crappy Dodge product.
#37
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I have a 2012 5.7 Hemi. At just over 100K miles it had 4 exhaust manifold bolt failures. It is clear that Dodge Ram has no engineers working for them. Bolt stress in dissimilar metals is 1st year engineering at most. I can live with wear out of brakes, exhaust systems, ball joints and other parts that move or are normal maintenance items. I can't and won't tolerate crappy engineering that results in expensive failures like these manifold bolts.This failure should never happen, period. It turned out that the exhaust headers were also warped and needed replacing. Utterly unacceptable.
This failure is so serious that my first Dodge Ram is also going to be my last. Later this year I'm going to buy either a Ford F150 or a GM Silverado rather than an under or zero engineered crappy Dodge product.
This failure is so serious that my first Dodge Ram is also going to be my last. Later this year I'm going to buy either a Ford F150 or a GM Silverado rather than an under or zero engineered crappy Dodge product.
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blue70ss (02-24-2020)
#39
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Well, it's been almost four months and Dodge (I don't really) Care, hasn't said a word about why the manifold bolts keep breaking in the Dodge Hemi engine. Seems she is a worthless mouthpiece for Dodge. Back in the 90's we were screwed by Dodge with plenum problems in the 5.9L Magnum and it seems, since that worked, they will screw us again with the Dodge Hemi engine. Nothing will be fixed as long as we keep buying Dodge Ram trucks.
#40
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Well, it's been almost four months and Dodge (I don't really) Care, hasn't said a word about why the manifold bolts keep breaking in the Dodge Hemi engine. Seems she is a worthless mouthpiece for Dodge. Back in the 90's we were screwed by Dodge with plenum problems in the 5.9L Magnum and it seems, since that worked, they will screw us again with the Dodge Hemi engine. Nothing will be fixed as long as we keep buying Dodge Ram trucks.
The following users liked this post:
blue70ss (02-24-2020)