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What is causing exhaust manifold bolts to break on the 5.7? #3094357
11/15/22 12:16 PM
11/15/22 12:16 PM
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mopars4ever Offline OP
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My 2014 ram 5.7 has broken exhaust manifold bolts on both sides. I fixed the right side about 6 months ago now the other side is broken. Does anyone actually know what it causing them to break? I heard it was the manifolds were warping. The last manifold I recently bought was on backorder. The dealer said the manifolds were on hold by the manufacturer for redesign or something. I wonder if the new manifolds will be any better?

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: mopars4ever] #3094362
11/15/22 12:25 PM
11/15/22 12:25 PM
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White Plains, NY
VCODE Offline
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I had the same problem on my 2004 Ram 2500 5.7. I replaced all the bolts and had the manifold machined. So far so good it's been about 2 years. They all do it. Cheap China Casting I guess.

Last edited by VCODE; 11/15/22 12:25 PM.

Mom & Dad let me buy a brand new 70 Challenger R/T 440 Six-Pack Super Trac Pack when I was 17

(Robert what is a 440 Six-Pack)
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: VCODE] #3094365
11/15/22 12:31 PM
11/15/22 12:31 PM
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West Virginia
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B1Frank Offline
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I did know the 5.9 engine was bad for that, i didn't know the 5.7 was too. ...........to small ! on the bolt side.

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: VCODE] #3094366
11/15/22 12:32 PM
11/15/22 12:32 PM
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ruderunner Offline
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I'm thinking more environmental. You 2 as well as I are in the rust belt/ snow belt area of the country. I have replaced manifolds on several brands of trucks and the common factor is rust. Ford manifolds will actually rust through but all suffer rusted bolts, rusted castings. The castings cause "rust jacking " where they expand under the bolt and pop the heads off.

Anyone from a rust free area have broken bolts?


Angry white pureblood male
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: ruderunner] #3094370
11/15/22 12:41 PM
11/15/22 12:41 PM
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Marion, South Carolina [><]
an8sec70cuda Offline
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It happens down here too. Had a friend w/ a 5.7 hemi that kept breaking exhaust manifold bolts. This was over 10 years ago.


CHIP
'70 hemicuda...8 sec street car
'69 road runner 440-6, 4 speed
'71 Demon 340
'73 Chrysler New Yorker
'90 Chevy 454SS Silverado
'06 GMC 2500HD LBZ Duramax...toy hauler
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: an8sec70cuda] #3094373
11/15/22 12:51 PM
11/15/22 12:51 PM
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mopars4ever Offline OP
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The two of the bolts on my right side were broken. They weren`t rusted. They were stainless OEM for those two positions.

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: mopars4ever] #3094415
11/15/22 03:03 PM
11/15/22 03:03 PM
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S.E. Michigan
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This is why, many of the older guys in the industry like my Dad, when OEMs started to change to metric in the late 70s,
fought it tooth and nail and complained to the powers that be.

Because his associates and he knew the finer increments of metric fasteners would allow Engineering to eventually reduce mass and cost to the point vehicles
would make it to 3-36, and after that...."hey, who cares? Make money from parts and service! Not our problem anymore".

This is what we have to work with....Iron manifold, aluminum head, tiny metric fasteners.
Think about expansion/contraction, hot/cold, over and over.
It's just a [censored] combination.

If those fasteners were 3/8" grade 5 or 8, think they'd still break?


Rich H.





Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: mopars4ever] #3094428
11/15/22 04:08 PM
11/15/22 04:08 PM
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Kalispell Mt.
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Aluminum head, iron manifold expand and contract at different rates and highly stresses the tiny bolts and most of the time it is the end bolts that break because that is where the most difference in expansion and contraction is experienced by the head and manifold.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: HotRodDave] #3094437
11/15/22 04:47 PM
11/15/22 04:47 PM
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Sniper Offline
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Originally Posted by HotRodDave
Aluminum head, iron manifold expand and contract at different rates and highly stresses the tiny bolts and most of the time it is the end bolts that break because that is where the most difference in expansion and contraction is experienced by the head and manifold.


Yep, the manifold is expanding in length when hot, contracting as it cools. That wiggles the bolt back and forth breaking them.

Funny thing is, Chrysler knew the solution, look at any flat head six, or slant six and you will see that was done to keep those long exhaust manifold from cracking or breaking studs.

[Linked Image]

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: Sniper] #3094478
11/15/22 07:53 PM
11/15/22 07:53 PM
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Round Lake Beach, Illinoisy
Rhinodart Offline
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My 2105 broke two on the passenger side, fixed under warranty but $200 deductible. Same on the drivers side. Next the passenger side again, but this time they had to replace the manifold also as I was warped beyond repair. Now at 348K and a new engine I hope (also a $200 deductible biggrin) I hope the studs stay in together... luck


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: Rhinodart] #3094479
11/15/22 07:57 PM
11/15/22 07:57 PM
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fredericksburg,va
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cudaman1969 Offline
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Tap them for bigger bolts 3/8s would hold it

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: cudaman1969] #3094527
11/15/22 10:07 PM
11/15/22 10:07 PM
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Freeport IL USA
poorboy Offline
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Back in the 60s & 70s, nearly every Mopar motor had cone shaped washers that allowed some movement and expansion due to heat. After they did away with the cone washers, the exhaust bolts started to break.

Maybe add the cone washers back in? I'd suspect McMaster-Carr probably has cone washers in the correct size. Might be worth the investment.

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: poorboy] #3094543
11/15/22 11:48 PM
11/15/22 11:48 PM
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Park Forest, IL
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Slant used low torque on the nuts too. 10 ft. lbs.


"Everybody funny, now you funny too."
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: slantzilla] #3094557
11/16/22 01:15 AM
11/16/22 01:15 AM
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Highland, MI.
Sunroofcuda Offline
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Are the manifold bolts stainless? If so, you can't harden stainless. They need to be grade 8.


No Man With A Good Car Needs To Be Justified
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: Sunroofcuda] #3094566
11/16/22 04:18 AM
11/16/22 04:18 AM
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My Ram has had a tick that goes away as it warms up that I've always just figured was a manifold so never did anything about it since I kept hearing about people fixing it only to have it happen again. I know someone who got tired of the repair and put headers on to solve the problem.

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: 5thAve] #3094571
11/16/22 06:10 AM
11/16/22 06:10 AM
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Wirenut Offline
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My 2014 is in the dealership now for this . Also it’s not mopar specific. Our GM trucks at work have the same issue .
I assumed it was an aluminum head vs cast manifold issue ,

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: poorboy] #3094578
11/16/22 07:24 AM
11/16/22 07:24 AM
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360view Offline
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Cone washers make engineering sense.

Using studs where the highest stressed middle is not threaded makes engineering sense.

Not having the end fasteners leave the aluminum cylinder at 90 degrees makes engineering sense.

Not sure Fiat Chrysler engineers left after old guys retired had “engineering sense,
or perhaps brainiac spreadsheet obsessed MBA’s in management never taught whiff of “engineering sense.”

Of course all this now corrected with French top management at Stellantis.

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: 360view] #3094582
11/16/22 07:40 AM
11/16/22 07:40 AM
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A Red State
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When I was working a repair station on the assembly line in the chassis department I told an engineer of a problem with a part that they had changed and the exact words of the engineer were "As long as it makes it out of warranty, we just don't care"..........


Kayse can't keep up at all now. lol
Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: SNK-EYZ] #3094620
11/16/22 10:58 AM
11/16/22 10:58 AM
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mopars4ever Offline OP
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Quote
Are the manifold bolts stainless? If so, you can't harden stainless. They need to be grade 8.
They were all oem bolts but I found out two bolts on the right side ( the ones that broke) were OEM stainless. I found out when I ordered new bolts and there was two different part numbers for that side. No idea why only those two. The left side were all regular Oem steel but three broke on that side also.

I was asking about the manifold because the mopar dealer said the manifolds were on nationwide back order due to a new part number being released so I was hoping it was a change in the manifold design in some way that would help the issue.

Re: What is causing exhaust manifold bolts to break on the 5.7? [Re: 360view] #3094647
11/16/22 12:10 PM
11/16/22 12:10 PM
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north of coder
moparx Offline
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"Not having the end fasteners leave the aluminum cylinder at 90 degrees makes engineering sense."



being stupid, i don't understand this part. could you please explain ?
TIA. bow
beer

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