Scuff (roughen) the area that the patch will
cover, so it will adhere tightly.
Apply the proper cement (adhesive), following
the directions in the tire repair kit.
Remove the covering from the adhesive side of
the patch and carefully place it on the inner liner.
Using a tool, called a sticher, roll it across the
patch to bond the patch tightly to the inner liner.
A few basic safety rules for repairing a tubeless
tire are as follows:
Do NOT attempt to repair a puncture by
plugging the tire from the outside. ALWAYS
dismount the tire and patch the inner liner.
Do NOT attempt to repair sidewalls or tires with
punctures larger than a 1/2 inch.
Reduce the air pressure to at least 15-psi, when
removing an object from the tire.
Broken strands in a steel belted tire can indicate
more serious damage than initially suspected.
Replace the tire.
Follow the procedures given in the tire repair kit.
If a tube tire has been punctured but has no other
damage, it can be repaired with a patch. Remove the
tube from the tire to find the leak. Inflate the tube and
then submerge it in water. Bubbles will appear where
there is a leak. Mark the spot. Then deflate and dry the
There are two methods to patch a tube leak. They
are the cold-patch method and the hot-patch method.
With the cold-patch method (also known as chemical
vulcanizing), first make sure the area is clean, dry, and
free of grease and oil. Scuff the area around the leak.
Then cover the area with vulcanizing cement. Let the
cement dry until tacky. Press the patch into place. Roll
it from the center out with a "stitching tool" or the edge
of the patch kit can.
With the hot-patch method, prepare the tube in the
same way as for the cold patch. Put the hot patch into
place and clamp it. Then, with a match, light the fuel on
the back of the patch. As the fuel burns, the heat
vulcanizes the patch to the tube. After the patch has
cooled, inflate the tube and recheck for leaks by
submerging the tube in water. Another kind of hot
patch uses a vulcanizing hot plate. The hot plate
supplies the heat required to bond the patch to the tube.
Preventive maintenance of tires and wheels
involves periodic inspections, checking inflation
pressure, wheel balancing, and rotation. Wheel
bearings are periodically lubricated and checked for
wear. These preventive maintenance steps will help
assure vehicle safety and a longer component life.
Tire rotation can be beneficial in several ways.
When done at the recommended times, it can preserve
balanced handling and traction of the tires and even out
tire wear. It can even provide performance advantages.
Manufacturers recommend that tires be rotated every
3,000 to 5,000 miles, even if they do not show signs of
wear. Tire rotation when done at the recommended
times helps even out tire wear by allowing each tire to
serve in as many of the wheel positions of the vehicle
Remember that tire rotation can NOT
correct problems due to worn mechanical parts
or incorrect inflation pressures.
While every vehicle is equipped with four tires,
usually tires on the front need to accomplish very
different tasks than the rear tires. And the tasks
encountered on a front-wheel drive vehicle are
considerably different than those of a rear-wheel
drive vehicle. Each wheel position can cause different
wear rates and different types of tire wear. It is to your
advantage when al! four tires wear together because
as wear reduces tread depth of a tire, it allows tires to
respond to the operator's input more quickly,
maintains the handling, and it helps increase the
cornering traction of a tire. Figure 8-41 shows
common tire rotation diagrams. A description of each
is as follows.
On front-wheel drive vehicles, rotate the tires in
a forward cross pattern (A) or the alternative X
On rear-wheel drive vehicles, rotate the tires in a
rearward cross pattern (C) or the alternative X
If the vehicle has directional tires, rotate these
tires from front to back only and vise versa(D).
If the vehicle has nondirectional tires that are a
different size from front to rear, rotate these tires
from side to side only (E).