Wheel Nut Torque; Wheel Stud Nut Torque; Wheel Tightening Sequence - Isuzu NPR 2008 Owner's Manual

55702_Sec03_'08 08.2.12 9:47 AM Page 7

WHEEL NUT TORQUE

CAUTION: Never use oil or grease on studs or nuts. Use the torque
specified for the type of wheels on the vehicle. Snug all wheel nuts
and then tighten to the specified torque in the numerical sequence
shown. Improperly tightened wheel nuts could eventually allow the
wheel to come off while the vehicle is moving, possibly causing
loss of control and personal injury and property damage.
When the vehicle, wheel or fasteners are new, have a technician
tighten wheel stud nuts and rim clamp nuts with a torque wrench
at 650 miles (1,040 kilometers). This is necessary because the
clamping system used on the wheels must seat before the fastener
will hold a uniform clamp load and remain fully tightened. Also
have a technician tighten wheel stud nuts and rim clamp nuts with
a torque wrench after installing any wheel.
In addition, nut tightness on all wheels should be set with a
torque wrench every 6,500 miles (10,400 kilometers).

WHEEL STUD NUT TORQUE

490 N·m (362 ft·lbs)

WHEEL TIGHTENING SEQUENCE

NOTICE: Some studs and nuts have left-hand threads. Those studs
are marked on their ends with the letter "L".
Install valve stems of dual wheels 180 degrees opposite each other.
1. Finger-tighten the nuts.
2. Tighten all nuts to specified torque in order as shown. Never use oil
or grease on the studs or nuts.
3. If a wheel stud and nut has been replaced, stake the stud and nut.
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