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Old 05-13-2007, 07:27 AM   #1
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I took my MH for a run yesterday up to the casino for the night. About half way there I noticed the exhaust rumble was decidedly loader, only when under load. I checked the engine with it running and found no apparent exhaust leaks or any other sounds out of the ordinary. The Jake also sounds loader and thumpier. This morning driving back I ran it hard and observed the exhaust sounds. It is definately alot louader broaching on unacceptable. The engine power seems normal with good turbo pressure at all speeds. I reved it when I got home and the engine was still hot. The engine sounds good at all RPM including WOT (wide open thottle)

Anybody have any ideas what it could be?

Peter
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Old 05-13-2007, 07:27 AM   #2
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I took my MH for a run yesterday up to the casino for the night. About half way there I noticed the exhaust rumble was decidedly loader, only when under load. I checked the engine with it running and found no apparent exhaust leaks or any other sounds out of the ordinary. The Jake also sounds loader and thumpier. This morning driving back I ran it hard and observed the exhaust sounds. It is definately alot louader broaching on unacceptable. The engine power seems normal with good turbo pressure at all speeds. I reved it when I got home and the engine was still hot. The engine sounds good at all RPM including WOT (wide open thottle)

Anybody have any ideas what it could be?

Peter
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Old 05-13-2007, 09:48 AM   #3
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Check that open window in the rear of the coach!!
Good luck!!
Gerard
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Old 05-13-2007, 10:14 AM   #4
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Gerard, Not even an open window would sound this cool. Sounds like a Nascar when it's at 2000+ RPM under load. I got a response on another forum that points to it being the flex pipe between the muffler and the exhaust cross pipe. Seems they have a tendancy to crack from time to time. I looked at it but it would be difficult to see if it only opens up with pressure.

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Old 05-13-2007, 10:20 AM   #5
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Here is a copy of JohnnyT's post from the other forum....

The muffler is connected to the exhaust pipe via a flexible metal hose... I have seen them develop a crack and then separate... I carry band clamps for that very reason...
Pretty sure that is your problem... If you have to replace the the hose its not that big a deal but more than likely you will have to drop the muffler which is a bit on the heavy side so if you do it yourself having help to get it back in place is a good idea... Your chassis should still be under warrantee so Spartan should cover having it replaced if you rather go that way...
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Old 05-13-2007, 10:25 AM   #6
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Thanks Bob. You are a wonder at finding and moving stuff.

Peter
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Old 05-13-2007, 10:27 AM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Thanks Bob. You are a wonder at finding and moving stuff. </div></BLOCKQUOTE>

Bob has a lot of spare time.
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Old 05-13-2007, 10:46 AM   #8
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Flex pipe may be the answer, had that problem on our highway tractor a few years ago. But it had a rust problem, which you shouldn't have at your age, coach I mean!!!
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Old 05-13-2007, 11:01 AM   #9
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No prob Peter....I try and keep an eye on all things Newmar on the forums so I knew where to look...

Gerard, I'm wondering if Peter and I are going to be the "high mileage" guinea pigs for the EXDP/LADB crowd and as such whether the combination of possibly a loose connection on a hose clamp, partnered with higher mileage and bouncing down the road of higher mileage driving had something to do with it...

The clamp may have already been loose, but someone that takes delivery of their coach and then doesn't drive it as much as Peter and I may not have had the chance to experience the issue...

Call us LUCKY I guess....
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Old 05-13-2007, 11:03 AM   #10
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Actually Peter I'm jealous you figured out a way to add a glass pack to an EXDP...
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Old 05-13-2007, 11:14 AM   #11
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Geez, Bob, I never had this problem before I added the dual exhaust. At least now I don't have to rely on the air horns, if I need someones immediate attention now all I have to do is jamb my foot to the floor.

Your point of more use bring the problems out sooner has some truth in it. I actually thought of this myself some time ago. After all, if you don't drive 'em they probably won't break or you will not know they are broken.

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Old 05-13-2007, 12:32 PM   #12
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More from the other forum on a possible temp fix...

Had not focused on the year of your motorhome... Yes I am fairly certain... The break or crack will more like be just above where the flexible pipe connects to the muffler and will be on the outside of the bend...

You probably can not see the problem looking in from the back of the engine you will be able to see it looking up from the bottom...

On edit...As a temp fix you can place a band clamp over the crack which will quite things down till you get it in to have it serviced... Any truck stop will have them as well as an auto parts store that carry parts for road tractors... You will just need to know what size...

Johnny
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Old 05-13-2007, 12:34 PM   #13
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Lug_Nut:
I took my MH for a run yesterday up to the casino for the night. About half way there I noticed the exhaust rumble was decidedly loader, only when under load. I checked the engine with it running and found no apparent exhaust leaks or any other sounds out of the ordinary. The Jake also sounds loader and thumpier. This morning driving back I ran it hard and observed the exhaust sounds. It is definately alot louader broaching on unacceptable. The engine power seems normal with good turbo pressure at all speeds. I reved it when I got home and the engine was still hot. The engine sounds good at all RPM including WOT (wide open thottle)

Anybody have any ideas what it could be?

Peter </div></BLOCKQUOTE>

Peter,

You seem to be describing similar noises that I noted on the ISM Fan Belt thread after the upgrade....a low frequency rumble/growl noise. I noted the noise under acceleration, typically when the transmission drops into 4th gear. And, during all applications of the jake brake.

Perhaps you should check to see if the fan belt has loosened up stretched)and may being riding on the deflector more frequently....Just a thought.

Sebastian
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Old 05-13-2007, 01:04 PM   #14
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Sabastian, Thanks for the thought, but no, my fan drive belt is within tolerance of tightness. The guard has been hit but no belt wear at all. I probably do not need the guard and without would afford more flex room. This is on my rig only as I have ground the frame section down and have a de-programmed Jake to fan on the ECM.
This is definately an exhaust sound and can be brought on in first gear with full acceleration.

Peter
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