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Old 05-18-2013, 08:45 AM   #15
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Your flux capacitor needs degoosing
Degaussing. You do that by reversing the polarity of the neutron flow, right?

Seriously, though, the hardest part of diagnosing a strange sound is finding out, "Is it supposed to make that noise?" I would suggest doing a test drive in another Sprinter there at your MB dealer, and find out if that one makes the same noise. If it doesn't, then you can ask the service department, "What's different in the drive train between that one and mine?"
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Old 05-18-2013, 09:24 AM   #16
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Degaussing. You do that by reversing the polarity of the neutron flow, right?

Seriously, though, the hardest part of diagnosing a strange sound is finding out, "Is it supposed to make that noise?" I would suggest doing a test drive in another Sprinter there at your MB dealer, and find out if that one makes the same noise. If it doesn't, then you can ask the service department, "What's different in the drive train between that one and mine?"
All seriousness aside, a little squirt of WD40 on the squirrel cage should get er done.
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Old 05-18-2013, 11:44 AM   #17
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So got a call from the dealer after a new diff and the problem is still there. They said that MB USA concluded this sound is normal. The mechanics did not believe them that this is a normal noise. So then came the field trip to another sprinter dealer who had a three duallies in for service. 1 from Winnebago, one from airstream, and one outfitted for construction They said they test drove the other duallies that were outfitted with some weight and they heard this noise too. At that point I received a call from them to come pick my rig up and that they too consider this noise normal.

Now we are sick to our stomachs paying out the wazoo for what we considered the finest class B on the market and now we re stuck with a whirring dud that Mercedes says is normal but none of you guys have heard it in your own vehicles. We run 6 sprinter 3500 duallies at our solar company. We carry around 1000's of pounds of solar panels, inverters and electrical equipment and do not have this sound in any of our trucks.

Now what?

I fly back into Atlanta on Wednesday to pick up my rig and told the dealer I will believe them once I drive another vehicle or two with this same sound. I find it hard to believe that all 3 duallies they test make this noise even though none of you have this problem and none of my other duallies have this problem.
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Old 05-18-2013, 12:30 PM   #18
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Driveshaft center bearing, trust me. Jim
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Old 05-18-2013, 12:35 PM   #19
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My question to the MB dealer that did the differential repair, how did they submit a warrantee claim for a repair that they now say is normal?
The Service Department may take quite a hit on that one, that is one big "Customer Goodwill" expense.

Keep all your records, it may be time to go up the chain of command. I would get it in writing that MB USA considers the noise "normal".

Have you read any of the Sprinter Forums?

"Rumble strip noise"

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Old 05-18-2013, 06:44 PM   #20
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Can't believe they replace the rear diff before the driveshaft carrier bearing.
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Old 05-21-2013, 01:27 AM   #21
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Driveshaft center bearing, trust me. Jim
Quick question on this one, since the noise happens at certain RPMs and does not seem to be connected to speed, you still think its a driveshaft bearing? Where is the center bearing located?
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Old 05-21-2013, 04:45 AM   #22
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Quick question on this one, since the noise happens at certain RPMs and does not seem to be connected to speed, you still think its a driveshaft bearing? Where is the center bearing located?
In the center between the two shafts....but it's hard to believe they'd overlook it.
The noise would definitely change with speed variations.
Most of the failures I've dealt with have been with the rubber bearing carrier and not the bearing itself, bang, bang, bang as the shaft rotates, especially on starts and under load, as opposed to a roar sound if the bearing itself has failed.


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Old 05-21-2013, 11:56 AM   #23
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I never noticed duals on Interstate. As for the Groaning/grinding; My Avenue brakes did that when I first got it. After a few miles of no change, I took it out and did a typical "brake drying"(like one does after driving through a large amount of water; only while dry this time) a few times for a few seconds each time while consistant pressure, while still accelerated at a moderate speed evenly, and that stopped mine. Sometimes the rotors just need a "dusting" and a glaze reduction. I also anticipate a stop so as to avoid hard braking with the amount of weight on a downhill while braking enough to avoid glazing.
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Old 05-29-2013, 10:32 AM   #24
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Ok, so I picked her up after 2 weeks in the shop and still have the noise. Was told its normal so I said let me take that brand new Interstate over there for a spin and if it makes the noise, I'll be convinced it is normal. Wouldn't you know it, without even leaving the parking lot I could hear the whirring noise already and when we came to a stop in the parking lot, the same grinding from the drivetrain.

I am surprised with these 2 rigs doing the same thing, no one else has this problem. Drove from Atlanta north through the hills of West Virginia and man is that noise annoying. I guess I will deal with the cards that I'm dealt.

Still need to look into driveshaft probs but I'm not sure it's the problem because its related to rpm. Makes noise from 2 to 80 mph only at certain rpms. It really sounds like a resonant sound more than anything else.
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Old 05-30-2013, 05:25 PM   #25
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I have the same problem...at speeds when the transmission drops from drive to the next lower gear and about 2700 rpm, there is a loud noise coming from the rear differential. It happens as long as you stay at the speed and rpm. It also happens briefly when initial moving but the gear change stops it.... I also have fluid/grease/brake fluid?? coming from the driver side rear dual...it streaks the rear dual....RMB in Atlanta is working on the second problem right now....don't know about the noise problem yet...
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Old 05-30-2013, 05:49 PM   #26
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because its related to rpm. Makes noise from 2 to 80 mph only at certain rpms. It really sounds like a resonant sound more than anything else.
Hi, if the noise is RPM related, then you can stop at the engine, and anything rotating with the engine at engine speed. Stopping at the torque converter. Also RPM related are noises caused by engine vibrations.

If speed related, I would say it's from the driveshaft back to differential or tires.
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Old 05-31-2013, 03:30 PM   #27
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The noise is definitely coming from the rear differential or rear end as I put my ear to the floor during the downshift and the loudest noise is over the rear diff. RBM is telling me to go to the Merc dealer in Montgomery to see what the fluid leak at the rear hub is...in the first month of ownership, I've had several problems...awning failed, propane regulator failed, bathroom vent not sealed allowing interior leakage and to top it off Bates RV won't call me back to tell me where the title application is I can register the vehicle which is now out of time for dealer tags....????????!!!!!!!!!! Do I wish I could do this again...you bet!!!!!
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Old 05-31-2013, 10:11 PM   #28
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That is so frustrating! Our dealer did that to us too...there was some little form that they neglected to tell us we needed before we could get our license plates. Luckily, they were able to email us extended temporary tags, and we got it worked out....but if I hadn't called....
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