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slippert
Top Member
USA
630 Posts |
 Posted - 11/04/2015 : 05:23:50 AM
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We purchased 3 2015 IC buses with the cummins 6.7 engines close to a year ago.... The last couple weeks 1 of them is giving me issues with strong odor/exhaust smell(eyes watering) in drivers area, from 6 feet down asile to rear of bus can't smell odor...smell is only there when engine regens and High temp exhaust light is on at slow speed or stopped...goes away once up to speed and no odor when not in regen...
I have been over and under bus numerous times, found one clamp on turbo pipe slightly loose(tightened that) found hole plug in body behind stepwell heater missing(installed a plug and sealed that),then I went over bus with silicone sealant anywhere I thought it might have a body leak that outside air could get in... other than what I found so far, I can find no other leaks at manifold, turbo or exhaust system!
Planning on sending bus to dealer to give them a go at it, but wondered if anyone else had ever had similar issue? If so what you had found? or if anyone cares to speculate ...I am open to any ideas
It appears these engines don't use a Closed Crankcase vent system,(has breather tube hanging on left rear) wondered if smell could be coming from crankcase, possibe engine issue causing this one to stink worst than others? |
Edited by - slippert on 11/04/2015 05:36:32 AM
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RonF
Top Member
867 Posts |
Posted - 11/04/2015 : 05:34:13 AM
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| Is the exhaust coming out beyond the bumper? |
US Army retired CMBT |
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slippert
Top Member
USA
630 Posts |
Posted - 11/04/2015 : 05:42:34 AM
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quote:
Originally posted by RonF
Is the exhaust coming out beyond the bumper?
Yes it is! but these IC's use that venturi/air makeup pipe in rear.... which I have never cared for.... seems like you would have to be moving to keep all exhaust odor going out of pipe to me... but has never caused an issue like this before in my fleet.. |
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Troy87
Senior Member
United States
52 Posts |
Posted - 11/04/2015 : 06:17:37 AM
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| We have some '15 BB, not IC, with 6.7L, with same issue and found loose clamps at the turbo. Tightened/replaced clamps .. good. I have also noticed that when the exhaust temps. are high, there is a slight odor if you are not moving. I don't know if there is a way to stop it completely, (still working on that). |
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krmvcs
Advanced Member
362 Posts |
Posted - 11/04/2015 : 07:22:00 AM
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...now this is what you might call "speculation"...
perhaps there are some rubber materials or body adhesives up in the front there that might be reacting or breaking down due to the high heat generated during a regen. maybe the glue used to attach the heat shield insulation. CYA and document everything on this one. years ago i had a driver blame the shop (another tech and i) because he missed a 90 degree left turn on the perimeter road and drove the bus up a berm.(no kids. adult air base transport and dead head back to the yard) he claimed he could smell exhaust coming up from the doghouse on a BB FE and passed out. dont remember the details of the investigation but we still had our jobs and he didnt. if this problem persists you might have to put it on a manual regen schedule just to avoid any potential issues in the future.
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Fastback
Top Member
1500 Posts |
Posted - 11/04/2015 : 07:32:13 AM
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| Maybe try switching the "stinky" bus to another route and see if issue follows bus....... |
Why yes, the ORIGinal CHARGER is a Fastback |
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second.flood
Top Member
USA
640 Posts |
Posted - 11/04/2015 : 08:40:48 AM
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| U-joint grease on the DPF. |
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aaronwilmoth80911
Top Member
538 Posts |
Posted - 11/04/2015 : 4:12:17 PM
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| We had a driver complaining about this just today. This bus was also just worked on by Cummins and had the turbo replaced and the DPF was pretty plugged up so we had to do a parked regen on it. I didn't personally look at it, but guy that did said he did not find anything wrong. |
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slippert
Top Member
USA
630 Posts |
Posted - 11/05/2015 : 04:48:54 AM
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Thinking i will bring in and try doing a manual regen just to see what happens and what smells I get today or if it helps get rid of eye watering stench inside bus after that.... with these busses being first ones here running DEF fluid, odor outside when running or in mitst of regen does seem more pungent, to say the least... I find most of the 2007 and newer emmission buses do have a stronger odor outside when exhaust is hot in process of regen and if odors stay outside passenger compartment really nothing that can be done for it...
Just not good when it seems to fill driver/passenger area.... these buses are not an air tight vessel, but normally can keep exhaust smells mostly outside as long as exhast system is tight and large holes are plugged in body |
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1forTBB
New Member
8 Posts |
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Strange issue in a 2015 IC w/6.7 Cummins
