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Exhaust Manifold Leak on Cummins ISL-400

Yahoo Message Number: 117536
Hello All,

We are having a screaming sound coming for the engine area. We have eliminated the belts and the pulleys as the cause. All of the hose clamps have been checked and we do not have an air leak. We have noticed black soot around 3 of the exhaust ports.

Has anyone had experience with an exhaust leak making this noise? We were warned by Cummins years ago that this engine can have possible exhaust leaks.

Thanks for your help.

Marta and Scott
07 Allure 31501

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #1 –
Yahoo Message Number: 117545
Marta and Scott, We had a leaking exhaust gasket on the ISL in our '04 Allure. It did not make a screaming noise. It was, rather, like a ticking. Each time the cylinder with the leak fired we would hear the leak as a psst. At idle of 600 RPM that would be 300 per minute or 5 per second. That made each psst sound like a tick.

Of course that doesn't mean a leak cannot sound as your describe. The evidence of carbon around the exhaust manifold is unmistakable. You have leaks.

See you Thursday.

George in Birmingham
'03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #2 –
Yahoo Message Number: 117548
Sounds more like a leak from your inter cooler radiator check your manifold pressure on acceleration

Robert McClernon
2000 Intrigue
40 one slide cummins 375

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #3 –
Yahoo Message Number: 117549
In addition to a CAC leak it could a ruptured boot in the intercooler system.

J Beach
06 Allure 31309

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #4 –
Yahoo Message Number: 117550
Does it disappear after it is warmed up?

Mark

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #5 –
Yahoo Message Number: 117560
It does not disappear after it is warmed up. We are sure the leak is the problem based on other posts on IRV2. Thank you.

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #6 –
Yahoo Message Number: 117561
Boost pressure are fine. We definitely think it is the exhaust manifold leak based on other posts about the ISL400. Thank you.

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #7 –
Yahoo Message Number: 117562
Thanks George. So looking forward to seeing you and Janet!!!

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #8 –
Yahoo Message Number: 117563
The air compressors are noted for making a screaming sound at times. Bob 06 intrigue 12047

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #9 –
Yahoo Message Number: 117566
ISL's, and ISC's, are known for Exhaust Manifold related opportunities:)! Since you were cautioned about a possible leak, I'd suggest either a slightly warping manifold, with actual blow exhaust manifold gaskets. Or a cracked manifold, that you have not detected. The discoloration you see, is another nod towards one, or even both, of the above. The sound you describe, could be the other items mentioned - but also a combination of the above could also present that noise. (Our crack, #3 tube, was more of a high pitch scratch sound then a ticking sound. But that was a crack. I could see how sound George described could happen with gasket leak.)

When the engine is not running, get mechanical telescoping mirror and flashing and hang into the engine bay as much as you can. Look on the and around the manifolds, close to where you are seeing the discoloration. (I'll share that upon occasions, in our 04 Allure, I've found enough room to crouchup behind the fan belt, and get close to the engine. (Easier getting up for me, then down:)!) - this will get you some closer access.

Best of luck to you, and please let us know what you find out, as it could help others down the road:)!
Smitty
04 Allure 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #10 –
Yahoo Message Number: 117567
There are aftermarket manifolds available with provision for expansion to eliminate cracking. Not that expensive and a simple DIY job.

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #11 –
Yahoo Message Number: 117572
Corina - I'd really appreciate a link to an aftermarket exhaust manifold for the ISL. I spent several hours on the internet, and made numerous phone calls, and struck out when looking for a better quality/alloy manifold for the ISL. This was about 3-4 years ago now, so things may have changed.

Many for ISB, ISM, ISX.

I do not recall any for the ISC either(?).

My research indicated that some owners of ISC's and ISL's were on their third Exhaust Manifold... I would have gladly paid a bit extra for a better quality manifold, and even one that added tad easier breathing too:)!

TIA,
Smitty
04 Allure 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)

Re: Exhaust Manifold Leak on Cummins ISL-400

Reply #12 –
Yahoo Message Number: 117573
A quick Google came up with Parley's Diesel as one possibility. You might contact Damon Rapozo as well, he knows of some diesel performance facilities.