LI41.10-N-068968

Noise from propeller shaft/rear axle from approx. 25 mph
Topic number
LI41.10-N-068968
Version
3
Function group
41.10 Propeller shaft
Date
07-23-2020
Validity
Model 907
Reason for change
Adaptation of the audio files
Reason for block
Complaint:
Noise from propeller shaft or rear axle from approx. 25 mph (vibrations, humming, droning, howling, running noise of
axle drive).
Cause:
Under analysis
Remedy:
In event of corresponding customer complaint, please create a PTSS case and include the following data:
- Is it a humming or a howling noise?
- Do vibrations occur at the same time?
- Does it occur at a specific engine speed, regardless of which gear is engaged?
- Is it louder in one gear than in another?
- When exactly does the problem occur?
- At which road speed?
- In which gear?
- At which engine speed?
- In which load condition?
- When carrying what sort of load?
- In what vehicle operating conditions (warm or cold)?
- Which tires and what size of tires are installed at present (attach pictures to the case)
- What type of leaf spring is installed: 1-leaf / 2-leaf / 3-leaf (attach picture of leaf spring, ensuring part number is legible).
- Pictures of the vehicle (inside, outside and underfloor, incl. suspension)
If possible, attach picture of propeller shaft with adhesive label including legible part number. (See Picture 01)
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It is absolutely essential to attach an audio file of the problem to the case.
The audio file must be recorded in MP3 or MP4 format using a suitable recording device (e.g. smartphone).
When doing so, make sure that there is no background noise.
Proceed as follows:
1. Measure phenomenon in constant conditions (at constant speed). Include the following details, saying them directly
on the recording: gear, engine speed, road speed. Then say "now!" when the phenomenon starts.
2. Ramp-up measurements in one gear, the gear being one in which the phenomenon is known to occur (according
to driver). When doing so, say the engine speeds on the recording in 500-revolution increments; here too say "now!"
when the phenomenon starts.
3. If the phenomenon occurs in several gears, carry out a separate ramp-up measurement for each gear.
An audio file is sufficient – a MOVIE file is not required.
Here again is a summary of the information required:
Required mobile phone measurements:
1) Ramp-up/acceleration with no gear change, with announcement of:  Gear  Engine speed at least every 500 rpm
 "now!" when noise starts.
2) Constant speed when noise occurs, with announcement of:  Gear  Engine speed  Road speed
3) Info on load: no / yes (how many kg)
Attachments
File
Description
01.jpg
Propeller shaft
Symptoms
Power transmission / Noises / Throbbing/intermittent humming
Chassis/suspension / Noises / Humming/droning/throbbing
Power transmission / Noises / Humming/droning
Power transmission / Drive shaft / Propeller shaft / Noises / Humming/droning
Validity
Vehicle
Engine
Transmission
Sprinter 907
642
711
Sprinter 907
651
725
Sprinter 907
651
711
Sprinter 907
651
722
Sprinter 907
274
725
Sprinter 907
642
722
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© Copyright Mercedes-Benz AG
BSTRINE
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Sprinter 907
274
722
Sprinter 907
274
711
Sprinter 907
642
725
Attachments
01.jpg:
07-23-2020 5:12 PM
© Copyright Mercedes-Benz AG
BSTRINE
Page 3/3