Chevrolet 30 Series 1967 Service Manual page 479

bead may "bind" on the rim, and refuse to seat.
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.
Be Safe!
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 pressure
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 buildup can be closely watched and so that
you can stand well back from the assembly during
the bead seating process.
Tube Type Wheels and Tires
Tube type tires using two or three piece rims are
available as optional equipment. T ires and tubes may be
demounted and mounted as outlined in this section.
Mounting and Demounting
T h r e e S e c t i o n R i m s — D e m o u n t i n g T i r e
1. Completely deflate tire by removing the valve core.
2. Using a hammer, tap around the side ring progres­
sively to move it in toward the center of the rim until
it clears the clamp ring (fig. 4).
F ig . 4 - Releasing Tire Clamp Ring
3. Starting at the split in the clamp ring, raise its end
Allowing
out of the rim gutter using a screwdriver and the tire
iron (fig. 5). Then remove the clamp ring by prying
it out of the gutter with the tire iron, moving pro­
gressively around the rim (fig. 6).
4. Drive the curved end of the tire iron in between the
side ring and the tire bead (fig. 7). Then pry down
on the opposite end of tire iron to move the tire bead
away from the side ring flange (fig. 8).
Continue
around the tire until the side ring is removed. In
some cases it may be necessary to work around the
tire more than once.
NOTE:
slightly tapered; this design makes removal of
ring much easier.
5. Push the valve stem up inside the tire to prevent
damage while removing the tire.
removed from the rim by turning it over and follow­
ing the procedure in Step 4.
WHEELS AND TIRES 10-5
the foregoing operation
The tire bead seat on the side ring is
Fig. 5 - Raising End of Clamp Ring
Fig . 6 - Removing T ire Clamp Ring
CHEVROLET TRUCK SERVICE MANUAL
progressively
The tire may be