Are 2022 Exhaust manifolds still an issue?

Lamarsh · Apr 25, 2022

Supposedly in the Gen 5s they used stronger bolts, and the bolt cracking hasn't been as much of an issue, but the manifolds themselves now can crack. Around 28k miles on my 2020 Rebel I heard that all too familiar "hemi tick," took it in and low and behold it had a cracked manifold. Replaced under warranty.

So, yes, it is apparently still an issue.

farout75 · Apr 25, 2022

The service manager at my dealer said the ticking from the cam rollers should have all but gone after 2017. My 17 has almost 105,00 miles and many hours of idle time. So maybe he is right on the cam and roller lifters. But the bolt issue is just a pig in a poke. I bought the Mopar unlimited mileage warranty for 84 months so if it goes bad I am ready. With the new 3.L twin turbo now out in the most expensive Jeep we shall see if its better than the 5.7. I am an old guy and V-8's are great in my mind, but maybe this new engine will be great. I am ipen minded so we shall see.

Lamarsh · Apr 25, 2022

farout75 said:
roller lifters

When I first told the dealer about the noise they said it's roller lifters, but I doubted it and just politely asked them to check the manifold, and I was correct, cracked manifold. Mine happened at 28k miles.

If mine cracks again after warranty I'm going to give strong thought towards headers.

Wild one · Apr 25, 2022

Lamarsh said:
When I first told the dealer about the noise they said it's roller lifters, but I doubted it and just politely asked them to check the manifold, and I was correct, cracked manifold. Mine happened at 28k miles.

If mine cracks again after warranty I'm going to give strong thought towards headers.

There's a thought these days,that alot of the manifold bolt breakage,might be attributed to the actual exhaust system bolted to the manifolds. The 5.7 cars use basically the same style cast iron log manifolds,and they don't have the bolt breakage problem the trucks have,and the thoughts are it's because of the mid pipe differances between the cars and the trucks. Only reporting what i've read,but it does make sense,as the cars use a totally differant style mid pipe behind the manifolds that puts less stress on the manifold bolts,especially the back bolts,which are always the ones that break on the trucks,and do carry most of the mid pipes weight.

skoold2003 · Apr 25, 2022

Captain Bart said:
I am in line to get my manifolds done. The mechanic tells me, he heats the old manifold to take the warp out, before re-installing them. Not sure if that would be permanent........

I’m afraid that I need to get them done too. Should I just bring it to the dealer and have them check? I’ve got a 5th Gen and no warranty.

N2MoPar · Apr 25, 2022

That won't work. I had multiple problems on my 2016 and the 1st thing I did was to get the warped manifold resurfaced at an automotive machine shop. Your mechanic is only going to put a lot of stress on the already frail exhaust manifold bolts.
Old manifolds have been thermally cycled and are less likely to warp again after being trued by resurfacing.

Nick@GotExhaust · Apr 25, 2022

Still an issue and we are seeing 5th gens with cracked manifolds instead of broken bolts. We have lots of customers going to shorties and long tubes due to manifold issues.

Lee Pedrick · Apr 26, 2022

If they would stop shutting down the front half of the motor this wouldn't be a problem. Half the manifolds are cooler than the other half. ECO shuts off the same front 4 cylinders every time instead of alternate cylinders. Anyone know how I can shut down ECO permanently?

Wild one · Apr 26, 2022

Lee Pedrick said:
If they would stop shutting down the front half of the motor this wouldn't be a problem. Half the manifolds are cooler than the other half. ECO shuts off the same front 4 cylinders every time instead of alternate cylinders. Anyone know how I can shut down ECO permanently?

The 5.7 cars shut off the same 4 cylinders and don't crack the manifolds. Get in the habit of manually shifting to 8th,and you'll disable the mds system,or have the truck tuned

Roy the Fixer · May 2, 2022

Just a comment concerning the Hemi Tick...if the cam rollers/lifters are ticking, the noise is not load sensitive. If the ticking changes as you increase and decrease the engine load, it is the manifold or broken bolt sure as hell! Part of the problem is the way they have the exhaust pipes secured near the front, which stresses the back of the manifold. It's almost always the same one or two bolts that break. Cracked manifold may be induced by certain temperature differences due to ECO as Wild one stated above.

Jim Bowker · May 2, 2022

Marmay said:
Hemi is on death row,there won't be any upgraded parts or etc,couple more years and FCA gonna stop producing this engines.

You can still get parts for the 318 which they quit putting in trucks twenty years ago! And it's not even FCA anymore. I'll start worrying in the year 2042.

indept · May 2, 2022

Wild one said:
The 5.7 cars shut off the same 4 cylinders and don't crack the manifolds. Get in the habit of manually shifting to 8th,and you'll disable the mds system,or have the truck tuned

Wild one said:
There's a thought these days,that alot of the manifold bolt breakage,might be attributed to the actual exhaust system bolted to the manifolds. The 5.7 cars use basically the same style cast iron log manifolds,and they don't have the bolt breakage problem the trucks have,and the thoughts are it's because of the mid pipe differances between the cars and the trucks. Only reporting what i've read,but it does make sense,as the cars use a totally differant style mid pipe behind the manifolds that puts less stress on the manifold bolts,especially the back bolts,which are always the ones that break on the trucks,and do carry most of the mid pipes weight.

How "open" are the car manifolds versus the truck as far as water from puddles splashing on the manifolds? One good splash could cause rapid cooling causing the bolts to break. Granted many manifolds are warped when removed. Is the warpage gradual or caused by a rapid cooling from a splash?

Wild one · May 2, 2022

indept said:
How "open" are the car manifolds versus the truck as far as water from puddles splashing on the manifolds? One good splash could cause rapid cooling causing the bolts to break. Granted many manifolds are warped when removed. Is the warpage gradual or caused by a rapid cooling from a splash?

Water splashing on a hot cast iron manifold is more inclined to crack the manifold itself. I'm not saying for sure it's the stress the mid pipe puts on the back bolts,but it sure makes you wonder. The 5.7 manifold's in the cars aren't really all that much differant then the trucks manifolds ,and they never break bolts,the only real differance between the cars and trucks are the midpipes and the way they're hung

indept · May 2, 2022

Wild one said:
Water splashing on a hot cast iron manifold is more inclined to crack the manifold itself. I'm not saying for sure it's the stress the mid pipe puts on the back bolts,but it sure makes you wonder. The 5.7 manifold's in the cars aren't really all that much differant then the trucks manifolds ,and they never break bolts,the only real differance between the cars and trucks are the midpipes and the way they're hung

My point being the 5th gens use better bolts so the manifolds crack on them so weaker bolts in our 4th gens the bolts are noble & sacrifice themselves.
Water can do strange crap. I remember back in the '70s big block GMs used double wall Y pipes. We had some of them come in the shop with very sluggish engines & no apparent or visible reason. We found the inner Y pipe collapsed inside the outer pipe causing a restriction in the exhaust. The most likely cause was water splashing on the very hot pipe causing it to cool & shrink, collapsing the hot inner pipe.

Wild one · May 2, 2022

indept said:
My point being the 5th gens use better bolts so the manifolds crack on them so weaker bolts in our 4th gens the bolts are noble & sacrifice themselves.
Water can do strange crap. I remember back in the '70s big block GMs used double wall Y pipes. We had some of them come in the shop with very sluggish engines & no apparent or visible reason. We found the inner Y pipe collapsed inside the outer pipe causing a restriction in the exhaust. The most likely cause was water splashing on the very hot pipe causing it to cool & shrink, collapsing the hot inner pipe.

I highly doubt they're using better bolts on the 5th Gens,it's more the stupid brace they decided was the cure all for the bolt breakage problem. Water on a steel pipe is a total differant entity then water on a cast iron manifold,cast iron cracks when it's subject to the cold water shock you'd get from a tire splashing up water from a puddle. If you figure it's always the back bolts that break on a 4th Gen,and the majority of the midpipes weight plus the stress it puts on the manifolds is focused pretty well strictly on the back bolts,it sure makes you wonder how much the midpipe itself is to blame for the bolt breakage issues

indept · May 2, 2022

Wild one said:
I highly doubt they're using better bolts on the 5th Gens,it's more the stupid brace they decided was the cure all for the bolt breakage problem. Water on a steel pipe is a total differant entity then water on a cast iron manifold,cast iron cracks when it's subject to the cold water shock you'd get from a tire splashing up water from a puddle. If you figure it's always the back bolts that break on a 4th Gen,and the majority of the midpipes weight plus the stress it puts on the manifolds is focused pretty well strictly on the back bolts,it sure makes you wonder how much the midpipe itself is to blame for the bolt breakage issues

Forgot about that brace. Guess our theories are moot since quite a few report no more problems if they get the manifolds resurfaced when doing bolts. At least this shouldn't be an issue for the new twin turbo I-6 since supposedly it has an integrated ex manifold on that.

Are 2022 Exhaust manifolds still an issue?

Lamarsh

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farout75

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