Mercedes-Benz Body & Equipment Guideline for Metris - BM 447, Version November 27, 2015.
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Please observe the revision notes compared to 09/18/2015 ! Only print out complete sections of the current version!
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7.1 Chassis
7 Modifications to the basic vehicle
7.1
Chassis
7.1.1
General information on the chassis
a
WARNING
Do not modify components of the chassis, which
can result in impaired and unstable vehicle handling
characteristics. For this reason, no modifications
whatsoever may be made to components of the
suspension system.
This is especially valid for:
•
Front transverse control arms: Changes to wheel
alignment settings are not permitted.
•
Front axle suspension subframe: It is not permitted
to modify or use the front axle suspension sub-
frame to mount additional equipment or make other
modifications.
•
Stabilizer bars: Any modifications to stabilizer bars
(diameter, material) at the front and rear, and the
retrofitting of the same, require a certificate of
non-objection from the responsible department,
see 1.6 “Contact” (
•
Rear axle: Modifications are not permitted.
•
Brakes: Modifications are not permitted.
•
Units, sensors, line routing for ESP
®
/ABS: Modifica-
tions are not permitted.
•
New screws/bolts must be used when installing the
front axle. All screws/bolts and threaded connec-
tions are to be tightened in accordance with the
Mercedes-Benz tightening instructions. Information
on this is available from your Mercedes-Benz Ser-
vice Center.
•
It is prohibited to shorten the free clamping length,
change to a stretch shank or use screws/bolts with
a shorter free thread.
•
The settling behavior of threaded connections must
be taken into account.
•
Additionally clamped components must exhibit
an identical or higher strength than the previous
clamped assembly.
•
The use of Mercedes-Benz tightening torques
assumes coefficients of friction for the bolts in the
tolerance range of [µ = 0.08 to 0.14].
•
We recommend the use of standard Mercedes-Benz
parts.
7.1.2
Springs/shock absorbers
Modifications to springs, shock absorbers and stabilizer
bars can only be made in the combinations specified by
Daimler AG on the front and rear axle. In this case an
upfitter impact study (UIS) is required. For any further
modifications, the front and the rear axles must be
adapted to each other and an upfitter impact study
(UIS) is required.
•
We recommend genuine Mercedes-Benz springs
•
Do not damage the surface or corrosion protection
of the springs during installation work.
•
Before carrying out welding work, springs must be
covered to protect them against welding spatter.
•
Do not touch springs with welding electrodes or
welding tongs.
On no account should springs or shock absorbers
be used if they do not correspond to the character-
istics of standard parts or parts obtainable as spe-
cial equipment. We recommend the use of standard
Mercedes-Benz parts.
