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Exhaust Manifold Wanted


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Hello everyone.  In a bit of a pickle here. In need of an exhaust manifold for my Cayman, Cummins casting number 3955199. Cummins isn’t expecting any until next year and literally noone on the internet has one.  Apparently aftermarket isn’t available as it’s still under copyright protection with Cummins? 

Many Thanks  

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Edited by BradHend
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@klcdenver, Thanks for looking.  I have literally called every site that comes up on google for this part - even the salvage yards -  No one has it.  That includes the ones on the pic you submitted. 

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Call Freightliner!.  So back in October 2021 I needed  the exhaust Manifold and bolts for my 2004 5.9, 300 HP Cummins. after my turbo blew and cracked the header.    Cummins by far was NO help at all. Waste of time!

They told me they did not know when they would get one in and  it could be a year out  ( The old COVIDI / supply issue excuse).   A mechanic in Cortez Colorado told me to contact Freightliner in Farmington NM.   Well,  it turned out that Freightliner had in stock, just on the west coast,  8 in stock and would ship out right away  Tucson had 3 California has 2 and another state had at least 2 IN STOCK which BTY  they purchase from Cummins!  AND  t was the same cost as Cummins quoted it would be.

 

 Good hunting 

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Cracked or warped?   I had one on a Cat engine that was warped so we ground it flat on a flat wood workers belt grinder.  It was long enough to grind all 6 ports at once. it worked perfectly. 

If you still can't find a manifold you might be able to get by with this guys redneck repair.   https://www.youtube.com/watch?v=ypJYbKX6v5I             

I don't think it could hurt anything to give it a try and if for no other reason it'll give you a glimps into another mans world.                                                                     Don't listen to the bad language,    🙉

 

Edited by Ray Davis
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I had a Ford 460 in my Class C.   Under warranty the passenger side had to be replaced, it had a bad crack.  It took 4 months to get a new manifold as Ford was having a big problem with this.  Got that one fixed and with a couple months the drivers side failed BUT I was out of warranty, I went with an after market.   About a year later the passenger side warped, pulled it and took it to a shop and had them resurface it flat, worked great.  To my knowledge both manifolds are still good as I sold the Class C to my mechanics father who at +90 still goes on trips. 

Depending on how yours failed it might be repairable. 

When the manifold on my 8.3 ISC failed I went with a Cummins for replacement, at the time after market weren't readily available.  My manifold cracked all the way around so not repairable, but if it is cracked lengthwise you might be able to have it welded until you are able to find a new one.  If it is warped you might get it resurfaced. 

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Firstly, I want to thank everyone for their input on this manifold dilemma I’m in.  Very much appreciated, and I have contacted everyone’s suggestion, but without any luck so far.  
As to the questions of it being warped, yes it is clearly warped at the broken stud on #6.  
I would love to be able to remove it, get it built back up and machined back flat with the rest, however I just cannot risk doing that due to the condition of the manifold itself and the attached equipment.   Manifold, EGR valve and the VGT Turbo are all heavily corroded, so I can almost guarantee there will be some consequential damage if I attempt to remove them.  
I have purchased new Cummins manifold gaskets, as well as spacers and bolts for my attempt to fix this, as well as a sheet of Remflex exhaust manifold gasket.  Going to try and use a stock gasket with a Remflex gasket to try and close this leak up until, by the sounds of it, next year when I might be able to get a new manifold.  At that time I will be replacing the turbo with a reman as well as a reman EGR valve.  Fun fun. 

I still cannot believe i can’t find this manifold anywhere.

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7 minutes ago, BradHend said:


As to the questions of it being warped, yes it is clearly warped at the broken stud on #6.  
I would love to be able to remove it, get it built back up and machined back flat with the rest

I haven't heard of anyone having to build the area up, only grinding all 6 flat.    However with no replacement available I would probably try what you are doing.

Good luck & let us know.   BTW what engine is this on?   If it's a 5.9 maybe a Dodge manifold will fit.

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Ray, it’s on the 5.9L ISB engine.  If it wasn’t for the dang EGR port on the manifold I could get the part…

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I’d get the non-EGR manifold and eliminate the EGR. Your engine will be much happier without all of the soot being pumped back into it. Ok, I’m ready to hear from everyone regarding how this a bad idea so have at it 😆

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Had great service, warranty and price for my 2004 Cummins 300HP ISB  turbo  Got it thru Trubochargersdirect.com it was a OEM Holset Factory Rebuilt turbo

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