·
Never exc
eed the permitted maximum
speed of the fitted tyres → page 379.
NOTICE
The valve can be damaged if due care is
not taken when using a tyre pressure
ga
uge.
·
When attaching the tyre pressure gauge,
ensure that you do not position it at an
angle to the valve stem.
Underinflated tyres will result in in-
crea
sed fuel consumption.
Checking the tightening torque
The correct wheel bolts must always be
used for each vehicle type and these must
always be tightened with the correct tight-
ening torque. The tightening torque of the
wheel bolts must be checked regularly with
a properly functioning torque wrench. In
addition, the tightening torque must be
checked without delay using a correctly
functioning torque wrench aer every
wheel change. If the tightening torque of
the wheel bolts is too low, the wheel bolts
and rims can loosen while the vehicle is in
motion. The wheel bolts and the threads
could be damaged if the tightening torque
is too high.
If the wheel bolts are corroded and sti,
they must be renewed and the wheel hub
threads cleaned before the tightening tor-
que is checked. Never grease or lubricate
the wheel bolts or the threads of the wheel
hub.
Tightening torque for wheel bolts
The tightening torque of the wheel bolts is
specified in the section Changing a wheel
→ page 372, Changing a wheel.
WARNING
If the tightening torque of the wheel bolts
is insucient, the wheel bolts and thus
the wheel c
an loosen while the vehicle is
in motion. The wheel bolts and the
threads could be damaged if the tighten-
ing torque is too high.
Incorrectly tightened or missing wheel
bolts can lead to loss of control over the
vehicle, serious accidents and fatal inju-
ries.
·
A
lways tighten the wheel bolts with the
correct tightening torque. If you do not
have a torque wrench, tighten the
wheel bolts with the wheel bolt wrench
and have the torque checked immedi-
ately by the nearest suitably qualified
workshop.
·
Never drive if wheel bolts are missing or
loose.
·
Always use wheel bolts that match the
wheel rims and the vehicle type.
·
Never grease or oil the wheel bolt and
the threads in the wheel hubs. The
wheel bolts could loosen while the ve-
hicle is in motion, even if the required
torque setting is used.
·
Make sure that the wheel bolts and
threads of the wheel hubs are clean,
smooth-running and free of oil and
grease.
·
Never loosen the bolts on wheel rims
with bolted-on rings.
Rotating wheels
Fig. 213 Dia
gram showing how to rotate
wheels (illustration).
Regularly rotating the wheels as shown in
the illustration → Fig. 213 is recommended
to help ensure that tyres wear evenly. All
the tyres will then last for about the same
time.
We recommend having the wheels
changed by a suitably qualified workshop.
352 Wheels and tyres
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