Loosening the anti-theft wheel bolt
Fig. 214
Changing a wheel: tyre valve
1
and
locations of the
anti-theft
wheel bolt
2
or
3
.
1. Take the adapter for the
anti-theft
wheel bolt out of the vehicle toolkit.
2. Insert the adapter into the
anti-theft
wheel bolt as far as it will go
→
3. Insert the box spanner into the adapter
as far as it will go
→
4. Hold the end of the box spanner and
turn the wheel bolt one turn anticlock-
wise
→
Screwing in the anti-theft wheel bolts
(wheel cover)
On wheels with a wheel cover, the
anti-
theft
wheel bolt must be screwed in at po-
sition
→
or
3
according to the
position of the tyre valve
1
. Otherwise, it
will not be possible to
fit
the wheel cover.
Tightening torque for wheel bolts
Specified
tightening torque for wheel bolts
for steel or alloy wheels:
— 140 Nm (103
ft-lb)
.
If the wheel bolts are corroded and
stiff,
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.
The tightening torque should be checked
with a properly functioning torque wrench
immediately
after
changing a wheel.
WARNING
Incorrectly tightened wheel bolts can
loosen while the vehicle is in motion and
cause accidents, serious injury, and loss of
control of the vehicle.
·
The wheel bolts and threads of the
wheel hubs must be clean, free from oil
and grease, and turn easily.
·
Always use the box spanner placed in
the vehicle at the factory to loosen and
tighten the wheel bolts.
·
Only loosen the wheel bolts by approxi-
mately one turn before raising the vehi-
cle with the jack.
·
Never grease or oil the wheel bolt and
the threads in the wheel hubs. This
could cause them to loosen while the
vehicle is in motion, even if the required
torque setting is used.
·
Never loosen the bolts on wheel rims
with bolted-on rings.
·
Regularly check the tightening torque
with a torque wrench. 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.
WARNING
The wrong wheel bolts can loosen while
the vehicle is in motion and cause acci-
dents, serious injury, and loss of control of
the vehicle.
·
Use only wheel bolts that belong to the
respective wheel rim.
·
Never use
different
wheel bolts.
Lifting the vehicle with the jack
Please refer to at the start of the
chapter on page 352.
Jacking points
Fig. 215
Jacking points.
354
Wheels and tyres
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