Rotating Wheels - Mercedes-Benz 420 SEL 1989 Owner's Manual

It is imperative that the wheel mount­
ing bolts be retightened after approx.
800 km (500 miles).
On new vehicles retightening is
carried out during the 1st inspection.
Retightening is also necessary
whenever wheels are fitted, e. g. when
the spare wheel is used for the first
time or when a set of wheels with
M+S tires is installed.
Tightening torque: 110 Nm (80 Ib-ft).
For tire specifications, refer to "Tech­
nical Data" .
Note:
The use of retread tires is not recom­
mended. Retread tires may adversely
affect the handling characteristics and
safety of the vehicle.

Rotating wheels:

The wheels can be rotated according
to the degree of tire wear while retain­
ing the same direction of travel.
Rotating, however, should be carried
out before the characteristic tire wear
pattern (shoulder wear on front
wheels and tread center wear on rear
wheels) becomes visible at a mileage
of 5000-10 000 km (3000-
6000 miles) as otherwise the driving
properties deteriorate.
Underinflated tires due to a slow leak
(e.g. due to a nail in the tire) may
cause damage such as tread separa­
tion, bulging, etc. Regular tire pres­
sure checks (including the spare tire)
at intervals of no more than 14 days
are therefore essential. Keep in mind
that warm tires have a higher pressure
than cold tires. (See tire pressure
chart on fuel filler door and the last
page.) If a tire constantly loses air, it
should be inspected for damage.
Use only genuine MERCEDES-BENZ
wheel bolts (identified by Mercedes
star).
Thoroughly clean the inner side of the
wheels any time you rotate the wheels
or wash vehicle underside.
Dented or bent rims cause tire
pressure loss and damage to the tire
beads. For this reason, check rims for
damage at regular intervals.
The rim flanges must be checked for
wear before a tire is mounted. Re­
move burrs, if there are any.