Chevrolet 1977 light duty truck Service Manual page 334

housing; to raise fron t wheel o f C, G, P models, place
jack under lower control arm pivot; to raise front wheel
of K models, place jack under front axle near spring
seat.
Dual and Single Wheels
W hen installing the tire and wheel on the vehicle,
the following procedure should be followed:
A fter wheel nuts are p ut on loosely, turn the wheel
until one nut is at the top o f the bolt circle; tighten the
nut just snug. Snug up the re m aining nuts criss-cross to
m inim ize runout, then
recom m ended torque alternately and evenly to avoid
excessive runout.
W hen installing wheels on vehicles with dual rear
wheels:
1. Install inner and outer wheel and clamp ring on
rear, or wheel and clamp ring on front (be sure pins on
clam p ring face outboard).
2. Install and snug nuts finger tight.
3. T orque nuts to specified torque in sequence
shown in Figure 4.
Lateral runout should not exceed 1 /8 " on front
wheel or 3 /1 6 " on rear wheel.
Matching Side and Lock Rings
Side and lock rings o f different rim types are not
interchangeable. Some m ay ap p ea r to be, but they do
not fit peoperly on the rim base. Serious accidents have
resulted from the use of m ismatched rings. Rim base
and rings must be matched according to m anufacturer,
size and type. This info rm atio n is stamped on each part.
Installing Synthetic Tubes
CAUTION: When
properly lubricated a n d mounted, they will
stretch thin in the tire bead a nd rim region.
This will cause premature failure.
1. Before installing tube in tire, clean inside of
casing thoroughly.
2. Insert tube in tire and inflate until it is nearly
rounded out.
3. Inspect rim for rust scale and bent flanges-
-clean rust scale and straighten flanges where necessary.
4. U sing a brush or cloth swab, apply a solution of
neutral vegetable oil soap to the inside and outside of
tig h te n the nuts to
tube and flap are not
tire beads and also the the rim side o f the tube. Do not
allow soap solution to run down into tire.
5. W hen m ounting tire and tube on a drop center
rim, follow the standard procedure. Be sure tire is
centered on rim so that beads are out o f rim well before
inflating. Do not allow tire to h ang loosely on wheel
while inflating.
6. Center valve and pull it firmly against the rim.
Hold in this position and inflate until tire beads are
firmly seated on rim against flanges.
7. Completely deflate tire by removing valve core.
the
8. Reinflate tire to recom m ended pressure.
TUBELESS TIRES
Tubeless tires mounted on one piece full drop center
rims are standard on some trucks. These tires have a
safety inner liner which if punctured, tends to cling to
the penetrating object forming a partial seal until the
object is removed from the tire.
The mounting and dem ounting of tubeless truck
tires will present no problem when a ru bb er lubricant,
such as Ru-Glyde or equivalent is applied to tire beads
and rim flanges. Ru-Glyde or equivalent in addition to
materially assisting in mounting and dem ounting also
prevents rusting at the tire sealing area
prevents tires from adhering to the wheel.
CAUTION: A hammer, or tools with sharp
edges, should never be used to demount or
mount tubeless tires as damage to rim flange or
tire sealing bead may result.
Inspection for Leaks
1. With wheel assembly removed from vehicle,
inflate the tire to recom m ended operating pressure.
2. Check for leaks at rim bead by placing wheel
and tire horizontal and allowing w ater to stand in groove
between rim and tire. Check for large leaks by lowering
assembly into water tank or running water over tire.
Demounting
1. Remove vlave core to completely deflate tire.
With tire lying flat on floor, loosen beads from rim seats
by walking around on tire with heels at points close to
rim. With wide side o f rim down, apply tire lubricant to
top bead. With stops toward rim, insert spoon ends of
two tire irons about 10" apart. While standing on tire to
hold bead in gutter, pull one tool toward center of rim.
2. Hold one iron in position with foot and pull
second iron toward center o f rim. Progressively work
bead off rim, taking additional bites if necessary.
3. Stand assembly in vertical position. Lubricate
second bead. At top o f assembly insert straight end of
tire iron between bead and back flange o f rim at about a
45 degree angle.
4. Turn iron so that it is perpendicular to rim. Pry
second bead off.
Mounting
All tubeless ties will be mounted as follows:
1. Inspect rim to insure bead seats are clean and
and thus