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WHEELS AND TYRES
16
4X4 WITH SPARE
4X4 WITHOUT SPARE
IV.
WHEEL RUN OUT
Wheel run - out is because of poor bead seating
on the rim. Poor bead seating is usually the result
of improper mounting or the use of improperly
made wheels.
Basically there are two types of run-out:
a. Radial run-out:
An "out-of-round" situation
where vibrations are produced as the wheel
spindle moves up and down.
b. Lateral run-out:
A side-to-side or wobbling
movement of the tyre and wheel.
Procedure to perform a wheel lateral and radial
run out check is as given below:
1. Mount the wheel on the vehicle or wheel
balancer. If on the vehicle, properly lift and
support the vehicle such that wheels can turn
freely.
2. Position a dial indicator on a rigid fixture.
3. For lateral run out check, position the indicator
point horizontally against the side of the wheel
rim flange. For a radial run out check position
the indicator point vertically against the tyre
mounting surface of the wheel rim flange.
4. Slowly rotate the wheel one full revolution
while observing the dial indicator.
5. Rotate the wheel to the position where the
lowest dial indicator reading was obtained.
6. Zero out the dial indicator.
7. Slowly rotate the wheel one full revolution
while observing the dial indicator.
8. Record the highest dial indicator reading.
Disregard any indicator readings caused by
welds, paint runs, scratches etc.
9. Perform lateral and radial run out checks on
both inboard and outboard sides of the wheel.