2008 Nimbus exhaust

Topic: 2008 Nimbus exhaust (Read 630 times) previous topic - next topic

2008 Nimbus exhaust

January 23, 2023, 08:36:34 pm

Was looking over my coach this last week in Quartzite and after speaking with a few others was considering putting a resonator on mine. But we were stumped by the sensors and tubing on my muffler. I see no mention of any of this in my manuals. Does anyone know what this stuff may be. My coach does not have DEF. Any ideas?

Re: 2008 Nimbus exhaust

Reply #1 – January 23, 2023, 09:57:32 pm

Quote from: Bigoil76 – January 23, 2023, 08:36:34 pm

Was looking over my coach this last week in Quartzite and after speaking with a few others was considering putting a resonator on mine. But we were stumped by the sensors and tubing on my muffler. I see no mention of any of this in my manuals. Does anyone know what this stuff may be. My coach does not have DEF. Any ideas?

That's interesting. What engine is in your coach. I have an 08' Nimbus 342 with an ISM 500. My muffler is totally different.

Re: 2008 Nimbus exhaust

Reply #2 – January 23, 2023, 10:03:21 pm

ISL 400...M3000 trans

Re: 2008 Nimbus exhaust

Reply #3 – January 23, 2023, 10:12:04 pm

Looks like pressure differential monitoring across the canister that's in the middle, particulate filter?

Re: 2008 Nimbus exhaust

Reply #4 – January 23, 2023, 10:17:59 pm

Yes Scott, that's what it looks like to me also. Jim, was looking at this with me the last couple days, out at Q, as I was talking to him about installing a resonator. I was just curious as to if removing this would give me some type of error code that would lead to another issue. I can't bfindvanything about it in my manuals.

Re: 2008 Nimbus exhaust

Reply #5 – January 23, 2023, 11:51:02 pm

Try calling FOT and pick their brains

Re: 2008 Nimbus exhaust

Reply #6 – January 24, 2023, 12:09:27 am

That's called a DPF, Diesel Particulate Filter. When the pressure between inlet and outlet gets too high it goes through a regeneration cycle where a diesel burner inside it turns the particulate into ash. The unit will get real hot during a recharge. For coach applications a regen will not happen very often due to all the highway driving.

Sorry, no resonator for you. I'm pretty sure the engine computer talks to it and would complain and possibly de-rate your power until it's fixed.

Re: 2008 Nimbus exhaust

Reply #7 – January 24, 2023, 08:54:54 am

Thanks John, makes sense. That's what it looked like to me also, just could find any information about it. Will check on the computer part of it. But your probably right about it being monitored. The resonator was just a thought to maybe improve performance a little and I like the sound. I'm just a big teenager wanting a big glass pack...😂😂👍...life will go on without ...

Re: 2008 Nimbus exhaust

Reply #8 – January 24, 2023, 09:11:18 am

Quote from: JohnFitz – January 24, 2023, 12:09:27 am

That's called a DPF, Diesel Particulate Filter.

The DPF showed up on engines built after June or July of 2007.

Quote from: Res777 – January 23, 2023, 09:57:32 pm

That's interesting. What engine is in your coach. I have an 08' Nimbus 342 with an ISM 500. My muffler is totally different.

An ISM 500 in a 2008 could be either DPF or non-DPF, depending on when the engine was built. The muffler gives it away (although you can verify via Cummins Quickserve)

Re: 2008 Nimbus exhaust

Reply #9 – January 24, 2023, 09:55:30 am

May also be unbelievably expensive to replace if you are ever required to operate within emission requirements. Im confident someone has figured out a work around, BUT personally I would want to see you retain the original and have it be a easy remove and reinstall (for test purposes only) setup. V-band clamps are your friend. It is also a life limited component and they planned for that with the current V-band clamps installed. Too heavy for me to want to deal with several times IMO.
Scott

Re: 2008 Nimbus exhaust

Reply #10 – January 24, 2023, 01:27:13 pm

Yeah, I think I will just leave it be. Not causing any problems. So I'm assuming it's doing what it's supposed to with regenerations and such. Will be about $1200-$1500 if I ever need to replace that filter. Hopefully not anytime soon. Thanks to all....

Re: 2008 Nimbus exhaust

Reply #11 – January 24, 2023, 03:52:33 pm

I had my son take a look at your picture and like mentioned above, he say's it's a PRE -DEF. Catalyst / DPF filter works by injecting diesel into the Catalyst by either a injector (Fuel Dowser) down stream of the turbo or has the engine injectors to over fuel to burn out the Catalyst and DPF filter. He's Cummins, CAT, MACK, Mahindra, Engine Certified since 2006. he also mentioned a Catalyst / DPF filter run's about 4-5K to replace but said they can be cleaned.

Re: 2008 Nimbus exhaust

Reply #12 – January 24, 2023, 05:37:15 pm

It would need a programmer to shut the DPF off.. You can open the dpf and punch everything out and run a straight pipe through it so it looks like its still working as its a visual inspection. You will need to find a programmer that works for the engine which you can check online to find something. Much cleaner and better than Original

Re: 2008 Nimbus exhaust

Reply #13 – January 24, 2023, 06:16:44 pm

I think I'll just leave it alone. I will research a little and see how it works though. All the connections to it are electrical except the two tubes running to the DP sensor. That piece in the middle with the big clamps on it is replaceable if need be. About 1200 bucks from Cummins. Thanks

Re: 2008 Nimbus exhaust

Reply #14 – January 24, 2023, 06:46:36 pm

Quote from: zmpm01 – January 24, 2023, 03:52:33 pm

I had my son take a lot at your picture, like mentioned above, he say it's a PRE -DEF.

Cummins didn't introduce DEF into the mix until 2011, I believe.

As a note, Foretravel did a "last time buy" on the 2010 pre-DEF ISX (10 engines, IIRC) and built up through the first year IH-45 coaches with that engine (aka the red eggshell due to valve issues).

Re: 2008 Nimbus exhaust

Reply #15 – January 24, 2023, 07:44:48 pm

Replaces 4965249 CUMMINS ISX EGR 2010 DPF ASSEMBLY (DIESEL PARTICULATE...

Looks the same to me but been wrong before

Re: 2008 Nimbus exhaust

Reply #16 – January 24, 2023, 07:58:00 pm

My bad I was trying to say before DEF fluid was required. PRE -DEF.

Re: 2008 Nimbus exhaust

Reply #17 – January 24, 2023, 08:12:07 pm

DPF is what I think everyone meant ... DPF came first then the DEF system.. Both suck or in this case blow..

Re: 2008 Nimbus exhaust

Reply #18 – January 24, 2023, 08:13:56 pm

Quote from: zmpm01 – January 24, 2023, 07:58:00 pm

My bad I was trying to say before DEF fluid was required. PRE -DEF.

No mea culpa needed - I understood what you were saying and was just fleshing out the details of when engines requiring DEF fluid were introduced. In Foretravels it's not clear-cut since some 2010 engines were used in 2012 coaches.

Re: 2008 Nimbus exhaust

Reply #19 – January 24, 2023, 08:53:11 pm

Yes the whole can is expensive for sure. It is possible to just replace the center sections individually if needed.

Re: 2008 Nimbus exhaust

Reply #20 – January 24, 2023, 09:34:10 pm

Yep you can get the center sections "if still available" but I would try to clean at least once if you have a failure.

I have pulled the catalyst out of catalytic converters for natural gas engines and had them cleaned or re-generated as they liked to call it and returned to service, didn't quite get the same duration of run time but very close 95% to 97%. compared to a new catalyst bundle. and way cheaper than replacing the whole catalyst.

Re: 2008 Nimbus exhaust

Reply #21 – January 26, 2023, 10:16:12 am

Does anyone out there with one of these pre-def, PDF coaches, know if there is a specific light or alarm on dash that I would see when a regen happens or is needed? Most of the Cummins literature I read refers to some type of dash lights acknowledging a regen either needed or occurring. Basically so you don't shutdown in the middle of the action. Nothing in my Foretravel box about it that I can find.

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