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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7.3 Engine peripherals/drivetrain
7 Modifications to the basic vehicle
7.3.3
Engine cooling
Modifications to the cooling system (radiator, radiator
grille, air ducts, coolant circuit etc.) are not permitted.
The cross-sectional areas of the cooling air intakes
must be kept free (risk of engine limp-home mode).
Do not obstruct the radiator air inlet.
Do not affix warning signs, labels or decorative objects
in the area in front of the radiator.
If required, flashing lamps at the front of the vehicle
are to be mounted at the side of the radiator grille area
(sealing of radiator section), on or between the horizon-
tal fins. The vertical bars of the radiator grille may not
be modified, as the stability of the radiator grille will
otherwise no longer be guaranteed.
Additional cooling equipment for major assemblies
shall be provided for cases where the vehicle is station-
ary and a high continuous output is demanded.
Disk brakes
Cooling must not be impaired by attaching spoilers
below the bumper, additional hub caps or brake disk
covers, etc.
a
WARNING
Modifications to the air flow of the brake system can
negatively affect the braking power.
In extreme cases, brake system overheating will not
only impair stopping power, it can also cause tire
damage.
For this reason, modifications which impair the flow
of cooling air to the brake system are only permis-
sible in consultation with Daimler AG (see chapter
1.6 “Contact” (
7.3.4
Engine air intake
Modifications to the engine air intake are not permissi-
ble.
The clean air side of the engine air intake system must
not be modified in any way.
Warm air
•
The intake of warm air will lead to a loss of engine
power. A bulkhead between the intake point and
the engine compartment is therefore essential.
•
The intake air temperature should not exceed the
outside temperature by more than 10 °C.
Water
•
Make sure that water cannot reach the intake
points through any fresh-air inlets. The flow rate at
the intake points must not be increased by modifi-
cations to the opening of the intake points.
Dust/dirt
•
The area of the intake must be shielded against
swirling dust from the wheel arch.
•
Increased dust intake will lead to shorter mainte-
nance intervals for the air filter.
7.3.5
Propeller shafts
!
Note
On no account should modifications be made to the
drivetrain.
