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Old 07-04-2013, 04:27 PM   #29
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Did you get the Konis on yet?
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Old 07-04-2013, 08:33 PM   #30
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Mutter, Mutter, grumble, NO, I have not yet installed the Konis.

I neglected to swing wide enough pulling into a filling station and got a minor (I stress the word MINOR) crease just behind the sliding curb side door. Between the insurance company negotiating with the body shop, ordering a small panel from Germany, and a smaller chrome trim piece from Airstream (all seriatim of course), my Interstate has been in the body shop for a month tomorrow and I still don't have an estimated completion date! In the meantime the Konis are sitting in my garage at home waiting for a vehicle to be installed on.

When I get my Interstate back from the body shop the Airstream dealer will still owe me a repair on the back door that occurred before delivery and reattaching the water tank sensors that have taken to falling off.

Sometime this summer, I hope to get my rig back, get the Konis installed, and have the chance to take our baby out on the road again.
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Old 07-05-2013, 09:34 AM   #31
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Man that sucks big time. Hope you get it back on the road this summer.
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Old 07-09-2013, 07:42 AM   #32
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Comes from the rear end. We were driving down the interstate in the Interstate and I put my ears to the place above the rear differential and the noise/vibration seemed to come from there...not that noticeable from the front...taking it to the dealer tomorrow for rear hub leak and will note it with them then.
This is considered a "normal noise by Mercedes". This noise is so annoying and loud and you are correct that is tied to RPM. When you go up a slight hill is whites loudly from the rear. They replaced a bunch of parts in the rear end and after 2 weeks in the shop, we got it back with the same noise and a "normal" explanation from Mercedes. It is related to the engine rpm and I think is is a resonant sound that the engine creates at certain RPMs. They worked the diff and the driveshaft with no luck. I was so bummed at that point, I told them I'd believe it was normal if they could show me the sound in another rig. So went down there and took another brand new one out on the road and sure enough, same noise.

I am convinced that this can be solved and will keep trying to dive into it when I am not touring these next 4 months. Let me know if you figure anything out.
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Old 07-09-2013, 08:51 AM   #33
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This is considered a "normal noise by Mercedes". This noise is so annoying and loud and you are correct that is tied to RPM. When you go up a slight hill is whites loudly from the rear. They replaced a bunch of parts in the rear end and after 2 weeks in the shop, we got it back with the same noise and a "normal" explanation from Mercedes. It is related to the engine rpm and I think is is a resonant sound that the engine creates at certain RPMs. They worked the diff and the driveshaft with no luck. I was so bummed at that point, I told them I'd believe it was normal if they could show me the sound in another rig. So went down there and took another brand new one out on the road and sure enough, same noise.

I am convinced that this can be solved and will keep trying to dive into it when I am not touring these next 4 months. Let me know if you figure anything out.
I am pretty sure it's resonance. Was thinking of trying Dynamats to absorb the sound and vibration ... Maybe someone else has a solution.
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Old 07-10-2013, 08:55 PM   #34
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It could be that the gears in the differential are not set up properly. If that's the case, then a good mechanic experienced in setting up differentials properly could fix it. Even if another one on the lot exhibits the same noise doesn't mean it's OK. It also might just be a case of sloppy gear tolerances, in which case it can't be fixed.

I'll bet MB cars don't make that noise and if they did, they get fixed.
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Old 07-10-2013, 10:04 PM   #35
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Something just occurred to me. I'm only guessing, so a reality check might be in order…

Given the amount of insulation in the floor of an Interstate, the sound should have been significantly attenuated. Yet it's still loud for you guys. Maybe for my Interstate, too, but I never ride in the back to hear it.

So how is that noise being transmitted to the interior? I'm thinking that the least-insulated area back there is the wheelwells, and it sounds like it's coming from the middle because you're hearing it from both sides.

If so, then for a temporary solution until a mechanic can sort it out, you might try lifting up the side-facing seats to stuff pillows, or foam, or some other sound-deadening material in the boxes over the wheelwells.

It may or may not help quiet things down, but it's easy enough to try, and doesn't cost much.
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Old 07-11-2013, 07:53 AM   #36
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Yes, that was exactly where I was going to try some sound insulation. The RBM folks told me that AS will be making plastic "drawers" to fit in this slot over the dual wheels but haven't had the chance to go to WM and see if something there might fit.

Lawn guys broke my rear quarter window yesterday weedeating...now it's a tape job.

While i was listening to the vibration last week I thought I felt it going up the side walls??? We were on a trip to NC pulling a small trailer...I might try the Koni's ... seemed to ride better with a full trailer being pulled...

Resonance could go from diff to axle to contact points of the body like where the shocks fit...hmmmm...
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Old 07-11-2013, 08:30 AM   #37
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Yes, that was exactly where I was going to try some sound insulation. The RBM folks told me that AS will be making plastic "drawers" to fit in this slot over the dual wheels but haven't had the chance to go to WM and see if something there might fit.
Since I never ride in the back, I never noticed a noise problem. I use the space under those seats to store my shore power cables and extension cords on one side, fresh water hoses, spare filters, etc. on the other side.

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Lawn guys broke my rear quarter window yesterday weedeating...now it's a tape job.
If you have trouble getting the window replaced, the manufacturer of the windows, CR Laurence, also sells direct. CRL Sprinter Van Windows

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Resonance could go from diff to axle to contact points of the body like where the shocks fit...hmmmm...
Which brings you back to the wheelwells.

A question… How much of the sound can be attributed to simple road noise, from the sound of the tires on the pavement— rather than the differential? Big, heavy tires, lots of ground pressure (otherwise you wouldn't need 61 psi) and duals for double the contact surface, can make for a lot of noise that you wouldn't get in a smaller vehicle, even with smooth treads on the tires. One way to find out, try listening while traveling on different road surfaces… asphalt, concrete, sod. If you get the same noise driving across a lawn as you do on the street, it's definitely not the tires, but if the noise goes away on the softer surface, it's the tires.

I thought of that on my way to work this morning, when I was passed by a 4×4 with knobby mudgrip tires, where the sound of tires on pavement was louder than his engine.
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Old 07-11-2013, 11:15 AM   #38
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I thought of that on my way to work this morning, when I was passed by a 4×4 with knobby mudgrip tires, where the sound of tires on pavement was louder than his engine.
Given recent highway engineering studies indicating somewhere around 70% of environmental noise on highways is the result of tires on the road surface that is certainly a possibility. If it is tire noise it should change with different road surfaces and even with different speeds.
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Old 07-11-2013, 05:11 PM   #39
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It only happens at certain RPMs regardless of road...I hear a small indication initially in the shift from 3rd to 4th as speed builds but only lasts a second due to shfit...lasts as long as I am going 68mph and 4th gear? One down from drive?? So I don't think it is the road.
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Old 07-11-2013, 05:52 PM   #40
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It only happens at certain RPMs regardless of road...I hear a small indication initially in the shift from 3rd to 4th as speed builds but only lasts a second due to shfit...lasts as long as I am going 68mph and 4th gear? One down from drive?? So I don't think it is the road.
That's fine. But I would have been remiss not to ask, since if it had been the road noise, you could have possibly saved some repair money.
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Old 07-11-2013, 08:44 PM   #41
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Travelling tomorrow...will put things into the wheel well space to see if the noise is affected....let you know.
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Old 07-11-2013, 09:42 PM   #42
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Does the noise change when you go from loaded drive train (accelerating) to unloaded (coasting) to level road @ constant speed?
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