Chevrolet 10 Series 1968, Service Manual, Page: 571 / 713

WHEELS AND TIRES 10-20
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F ig . 3 4 —Removing Ring
Fig . 354-Prying Bead over Edge of Ri
Fig. 3 6 —Prying Second Bead From Rim
7. Insert thin end of rim tool or heavy screw driver and
pull ring outward toward centered position. Strike
with mallet, forcing ring into gutter (fig. 32).
Demounting
First remove valve core to completely deflate tire.
Place tire and wheel on floor with side ring up.
To loosen first bead, drive hooked end of rim tool
between tire and rim flange and press downward on
bead (fig. 33).
Progress around rim, using 2 tools, as shown.
To remove ring, insert tool in notch and force ring
opposite of notch into gutter, then pry off (fig. 34 ).
Pry out and up on side ring, carefully but firmly.
(Be careful not to bend side ring.)
Force upper tire bead into well opposite the valve
slot and with tire tool pry opposite portion of bead
over edge of rim (fig. 35).
Turn tire over and by means of rim tools, loosen
bead on opposite bead seat. This can be further aided
by using foot pressure.
Make sure one portion of second bead is still in the
rim well, then pry opposite portion of bead over edge
of rim (fig. 36). This will free the tire from the rim.
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CHEVROLET TRUCK SERVICE MANUAL