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Old 03-05-2021, 07:14 PM   #1
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Cracked ISC manifold

I’m sure many of us have had this issue. I’m a do it my self type of fella so I’ll be fixing mine my self. I’m seeing many suppliers selling a replacement manifold but wondering to get the best for the money.
I’m reading the aftermarket brands are built better than oem.
This one certainly looks better built than the one on it

http://https://www.4statetrucks.com/engine-parts/semi-truck-aftermarket-exhaust-manifold-for-cummins-c-isc-series-replaces-3943841-3937477_211172.asp?gclid=EAIaIQobChMInsHgwLaa7wIVR PHACh1QoAo0EAQYASABEgIdL_D_BwE

Thoughts?
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Old 03-05-2021, 07:28 PM   #2
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I changed my manifold back in 2015, at the time I couldn't find an after market but I wouldn't be afraid of one.

I had a Ford with 460, the oem manifold on passenger side failed still under warranty. The drivers side failed out of warranty and I replaced myself. Guess what, about 6 months later the passenger side warped, I had it machined flat and it was still good when I sold the motorhome.



Changing the exhaust manifold on my ISC 8.3 wasn't to bad. I'd recommend just removing the turbo since in the end I had to do that anyway. I did spray down the studs with PB blaster the day before I started, didn't have a problem with any studs. Biggest issue was working by myself and dropping tools, if you have a helper it wold be a worth your while and probably a case of beer (after your done).


While you are in there you should do maintenance on your Pacbrake if you have one.
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Old 03-05-2021, 07:50 PM   #3
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Thanks.
I have already did the work on the brake valve. It seems like a easy job. Iv done others in the past. Just new to the Cummins.
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Old 03-05-2021, 07:58 PM   #4
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Looks like a good part. Price is reasonable. The big concern I would have would be breaking a stud.
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Old 03-05-2021, 08:02 PM   #5
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Looks like a good part. Price is reasonable. The big concern I would have would be breaking a stud.
Yes. Hopefully patients will help.
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Old 03-05-2021, 08:17 PM   #6
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Good luck.
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Old 03-05-2021, 11:08 PM   #7
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Don't forget to order all the gaskets , and start soaking those bolts now.
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Old 03-06-2021, 04:09 AM   #8
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Originally Posted by Xmcdog View Post
Looks like a good part. Price is reasonable. The big concern I would have would be breaking a stud.
On the ones I have done at work (not on RVs, but on big high HP cummins driven pumps), there are always a few broken studs before you even get started. When the junk manifold starts to do its twisting (which causes the cracks), it will snap off a stud or two at the head. The intact studs have always come out without much drama.

I've bought OEM (cummins) manifolds. They were all made overseas (stamped china or thailand or somewhere like that). Pretty disappointing for a high dollar factory part. Seeing how bad the OEM stuff is. I can't see how the aftermarket part could be any worse.
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Old 03-06-2021, 10:49 AM   #9
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On the ones I have done at work (not on RVs, but on big high HP cummins driven pumps), there are always a few broken studs before you even get started. When the junk manifold starts to do its twisting (which causes the cracks), it will snap off a stud or two at the head. The intact studs have always come out without much drama.

I've bought OEM (cummins) manifolds. They were all made overseas (stamped china or thailand or somewhere like that). Pretty disappointing for a high dollar factory part. Seeing how bad the OEM stuff is. I can't see how the aftermarket part could be any worse.
Agree, bought a genuine Cummins ISC manifold with gaskets and some studs for about $800. Cummins box and receipt, but manifold stamped with "made in china". Will go aftermarket next time.
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Old 03-06-2021, 06:02 PM   #10
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Got it off fellas. Wasn’t a bad job to remove it just so tightly compacted around the turbo. Otherwise only broke one bolt in the head. I think I just pulled too much and was bending the bolt (because of the long spacers) and snapped it. I can get it out.
The manifold was broke. Not crack. It’s now a three piece. Lol. Anyway bought the manifold I posted above, all the gaskets and such. . The company emailed me for fitment verification so I should be good from here on.
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Old 03-07-2021, 12:20 PM   #11
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Got it cleaned up most of the way. Hope it will go back next weekend. 😁

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Old 03-08-2021, 12:06 AM   #12
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Looking good James ,

I know a lot of coach owners who'd like the kind of access to the engine , that we have.
When I found the wastegate activation hose fitting broken of my turbo housing; during an oil filter change ; I had the turbo on the bench to extract the broken fitting in an hour. Most owners can't find there engines in an hour, with the access panels they have to remove, to get through their bedroom floors.
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Old 03-12-2021, 05:13 PM   #13
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Got the new manifold in today. I wanted to post a picture of it here so people could see it.
This is an after market manifold. I purchased it from vander haags truck parts.
It looks more heavy duty than the oem. And only costed $200 with shipping.
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Old 03-12-2021, 05:18 PM   #14
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It does look heavy duty, I like the extra fins, notice that one of them is where the old one broke.
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