Cracked Exhaust Manifold

[G-Ride990]

Not my truck.

My dad has been complaining about a little tick at start up on his 2021 Bighorn 5.7 2wd truck with 47k miles. I told him to check the manifold bolts. Well he finally got around to doing it and he sent me this picture this morning.

I don't remember seeing much about this on the forum.

He's not one to go throw long tubes and a tune on his truck so he's just going to order another OEM manifold or see if the dealer will cover it under his powertrain warranty. But, is this common?

 

[mrack]

Apparently that metal piece running across the bolts on newer trucks is causing the manifolds to crack rather then snap the bolts. So I hear anyways. Pick your poison

 

[G-Ride990]

Helped my dad get the manifold swapped out this weekend.

Looks like there is a different part number on the new manifold, slight changes to the design but nothing drastic. Wonder how this new one will hold up.

Wasn't too bad, way easier than putting the LTs on my 4th gen. The dipstick is easier to mess with on his 5th gen too. Took us about 3 hours or so. And I was rotating my tires at the same time he worked on his truck.

From what the dealer told us, you can only buy the manifold as a kit now. And it came with everything including extra bolts for about $200ish from what my dad told me. I didn't double check what it cost but that seems pretty dang cheap!

I'd much rather break the manifold over bolts with how easy this was and since the kit comes complete.

 

[Wild one]

Helped my dad get the manifold swapped out this weekend.

Looks like there is a different part number on the new manifold, slight changes to the design but nothing drastic. Wonder how this new one will hold up.

Wasn't too bad, way easier than putting the LTs on my 4th gen. The dipstick is easier to mess with on his 5th gen too. Took us about 3 hours or so. And I was rotating my tires at the same time he worked on his truck.

From what the dealer told us, you can only buy the manifold as a kit now. And it came with everything including extra bolts for about $200ish from what my dad told me. I didn't double check what it cost but that seems pretty dang cheap!

I'd much rather break the manifold over bolts with how easy this was and since the kit comes complete.

Keep us updated on how they pan out G,as i'm wondering if this might be an upgrade that'd also work on the 4th Gens.
That would be $200 per side i'm guessing

 

[G-Ride990]

Keep us updated on how they pan out G,as i'm wondering if this might be an upgrade that'd also work on the 4th Gens.
That would be $200 per side i'm guessing

Will do. I am expecting to have to put some in my truck eventually too so I wanted to help out and see how bad of a job it was. Yeah $200 a side. He only replaced one.

I don't remember off the top of my head how the 4th gen manifold looks but, looking at the upgraded BD diesel version of the 4th gen manifold, it looks like the collector doesn't have as much of a bend as the 5th gen collector does. He was planning on getting BD's until he realized his truck was a DT.

Here's the BD 4th gen for comparison.

 

[mikeru]

I've seen quite a few reports of cracked exhaust manifolds on 5th gens, so it's fairly common apparently. They all seem to crack in that same spot. At least the pics I saw showed that. Not sure which is worse, although once out of warranty I'd rather swap out a manifold than have to extract a broken bolt out of the head.

 

[G-Ride990]

I've seen quite a few reports of cracked exhaust manifolds on 5th gens, so it's fairly common apparently. They all seem to crack in that same spot. At least the pics I saw showed that. Not sure which is worse, although once out of warranty I'd rather swap out a manifold than have to extract a broken bolt out of the head.

Answered my own question...

I agree, removing those broken bolts was a pain in my 2016. I'd rather swap out a manifold log.