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Old 09-14-2021, 02:27 PM   #1
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8.3 Cracked Manifold help

Cummins says 8 weeks national back order...
No aftermarket ones anywhere
Mine is a ESN 45830208
CAsting number is ( Long ) 3943836
( Short ) 3943850


The long one has cracked as typical 8.3 units do..
Even if I have to use the old short part with it ..
Anyone out there have any resources, Ive pretty much burned up all google etc
I already have all gaskets, and misc hardware, And was sent wrong manifold....
Any and all help welcome
:(
Thanks
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Old 09-14-2021, 02:51 PM   #2
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Came up with mine last year when everyone else said not available!
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Old 09-14-2021, 03:02 PM   #3
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Create an account on the Cummins Quickserve site
https://quickserve.cummins.com/info/index.html
register the engine
Then do a search for the manifold, it will show the most current numbers.
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Old 09-16-2021, 12:02 PM   #4
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Got one last month. Had same problem, got wrong one. The correct kit is 5633650, and is usually available as a kit but not as individual parts.
BTW, the kit listed by cummins is the wrong one. The kit was about same price as just the manifold.
Good Luck!
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Old 09-16-2021, 11:56 PM   #5
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Yours can be brazed until one is available if you have to get moving.
It can also be stick welded with high nickel rod. And a lot of cast iron is mig weldable believe it or not. I had no choice once on a motor swap but to move the downspout on a manifold once. I was going to just use the mig to tac it, then pull it off and nickel rod it. The mig worked so well I did the whole thing with it. Been doing it for 30 years, with no failures. You know immediately when you try if it will or won't mig.
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Old 09-18-2021, 08:25 PM   #6
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Been there done that! Wait for the proper "improved, reinforced" Cummins part. It is much beefer than the OEM manifold.
The entire weight of the turbo-charger and associated piping rests on the manifold.
Never attempt to use ˝ an old manifold with ˝ of a new manifold, they will never seal as designed.
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Old 09-18-2021, 11:55 PM   #7
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Found several new aftermarket 8.3 ex manifolds on eBay the other day. Not sure if the part you need was there.
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Old 09-19-2021, 08:32 AM   #8
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Cummins parts are just about all chinese so they are likely the same part.
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Old 09-25-2021, 11:45 AM   #9
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On the Road again!!!

Received a brand new exhaust manifold from Cummins, Took about 3 to 4 hours install with a bunch of dropped parts that I had to retrieve from the bottom in which I put a huge hunk of cardboard to catch hardest part was lining up the turbo boot underneath by myself other than that everything went super smooth started it up ran for a while then I change the oil whole job cost me about $1200 I replace just about everything possible while I was there and the next guy who hast to do this should send me a Christmas card with everything literally soaked in copper thread anti-seize high heat thank you everyone who donated information
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Old 09-25-2021, 01:30 PM   #10
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Quote:
Originally Posted by NWCycle View Post
Received a brand new exhaust manifold from Cummins, Took about 3 to 4 hours install with a bunch of dropped parts that I had to retrieve from the bottom in which I put a huge hunk of cardboard to catch hardest part was lining up the turbo boot underneath by myself other than that everything went super smooth started it up ran for a while then I change the oil whole job cost me about $1200 I replace just about everything possible while I was there and the next guy who hast to do this should send me a Christmas card with everything literally soaked in copper thread anti-seize high heat thank you everyone who donated information


You found a manifold. Good deal. So they’re not 8 weeks out any more?
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Old 09-27-2021, 04:04 PM   #11
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not sure

They had 2 when I was told they came in, So was thinking on cornering the market and buying both...

Maybe be like those guys who bought all the mask from e bay during Covid
Anyone wants the hours of info I went through as far as parts etc, be glad to help
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