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WHEELS AND TIRES 10-6
lifted on the rim to force the top tire bead
against the top rim flange. The weight of the
tire will seat the bottom bead.
Repair
When a tire loses all or most of its air pressure,
particularly when driving at high legal speeds on today
1
s
super-highways, recommended procedure is to remove it
from the wheel for complete inspection to be sure no
tire damage has occurred. Punctured tires should be
removed from the wheel and permanently repaired from
the inside.
Externally applied plug type repairs should be con-?
sidered temporary and the tire should be permanently
repaired as soon as possible.
Hot Patch Method
It is essential to thoroughly clean and remove all
foreign matter from the hole left by the puncturing-object
without enlarging the injury and then follow the manu-
facturer's instructions for vulcanizing the patch.
Rubber Plug Methods
There are several types of rubber plugs--some are
inserted from the inside of the tire; others are inserted
from the outside of the tire without demounting the tire
from the rim.
When using the plug method be sure to clean and
lubricate the hole with repair cement before inserting
the plug. Your tire supplier has available complete kits
containing materials, tools and detailed instructions for
making repairs with plugs. Follow instructions in the kit
you use.
Cold Patch Method
(Self Vulcanizing Type)
In this method it is essential to thoroughly clean and
remove all foreign matter from the hole left by the
puncturing object without enlarging the injury; also on
the inside of the tire, buff an area large enough for the
patch. Follow the manufacturer
1
s instructions for appli-
cation of the special cement and self-vulcanizing cold
patch.
Pressure Gun Method
Several types of pressure guns are available. Consult
your tire supplier for materials and instructions.
Tire Installation Safety Precautions
When tires are mounted on dirty or corroded rims, or
when they are not properly centered on rims, the tire
bead may "bind" on the rim, and refuse to seat. Allowing
pressure to continue to build up within the assembly in
an attempt to seat the tire bead is a DANGEROUS PRAC-
TICE which can result in a broken tire bead, and serious
injury to the serviceman.
1. Make sure that rim flanges and bead ledge (espe-
cially hump and radius) areas are smooth and clean.
Remove any oxidized rubber, dried soap solution,
rust, heavy paint, etc. with a wire brush, or, in ex-
treme cases, a file.
2. Lubricate tire beads, rim flanges, and bead ledge
areas with a liberal amount of thin vegetable oil
soap solution, or approved rubber lubricant,
3. Insure that air pressure build-up during the bead
seating process is not allowed to exceed 40 pounds
pressure. If beads have not seated by the time pres-
sure reaches 40 pounds, assembly should be deflated,
re-positioned on rim, re-lubricated and re-inflated.
4. Make sure valve core is inserted in valve stem
prior to inflating.
5. Use an extension gauge with clip on chuck so air
pressure build-up can be closely watched and so
that you can stand well back from the assembly
during the bead seating process.
WHEELS
Valve Assembly
Replace
NOTE:
Always use new valve assembly when
replacing.
1. Cut or drive old valve assembly out of rim.
2. Clean valve hole and surrounding area on inside of
flange with steel wool.
Fig. 6 - Installing Valve
Fig. 7 - Rim Inspection
CHEVROLET CHASSIS SERVICE MANUAL
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