Chevrolet CHEVY VAN G10 SERIES Service Manual page 291

G eneral D e s c r ip tio n ................................................................
Tire Tread Wear I n d i c a t o r ..............................................
Puncture Inspection and R e p a ir.....................................
Tire I n fla tio n .......................................................................
Service O p e r a tio n s ..................................................................
Jacking In s tru c tio n s ...........................................................
The 1972 Chevy Van and Sportvan tru ck is equipped w ith a
wide range o f tubeless type tires and wheels selected according
to the tru ck GVW rating and type o f service. All Light-Duty
30 Series tru ck m odels will be equipped w ith nylon cord truck
ty p e tires. 10 & 20 Series w ith bias belt passenger car type
tires. Wheels are o f the short spoke type.
Only those tires o f th e size listed in this section are
recom m ended for use on your vehicle. Use o f any other size o f
tire m ay seriously affect ride, handling, ground clearance, tire
clearances, and speedom eter calibration. To achieve best all
around vehicle handling perform ance, fibreglass belted tires,
radial ply tires, and bias ply tires should n o t be m ixed o n the
same truck.
TIR E TREAD WEAR INDICATO R
The original equipm ent passenger type tires on 10-20 series
incorporate built in tread indicators to assist in judging when
tires are w orn o u t and should be replaced.
These indicators are m olded into th e b o tto m o f the tread
grooves and will appear as bands across th e tread as a visual
rem inder th at the tire should be replaced (See Fig. 1).
W hen the depth o f tread becomes 1 /1 6-inch or less as
indicated by the bands, there is a significant decrease in
traction and anti-skid properties, also, the m ajority o f tire
troubles will occur in the last
TREAD
STILL G O O D
Fig. 1—Tire Tread Wear Indicator
SECTION 10
WHEELS AND TIRES
GENERAL DESCRIPTION
10
% o f tire life.
TREAD
W O R N OUT
INDEX
Page
10-1 Wheel N ut Torques (Also See Specifications) ..........
10-1
C orrecting Irregular Tire W e a r .......................................
10-1
Wheel and Tire B a la n cin g ......................................................
10-1 Tire Rem oval and Installation ............................................
10-2 Tubeless T y p e ....................................................................
10-1
Puncture Inspection and Repair
A t each lubrication, tires should be checked for foreign
objects in th e tread or breaks in the tread or side-wall. If tire is
punctured or otherw ise dam aged, it should be repaired using
one o f several repair kits available thro ug h tire m anufactures'
outlets.
TIRE IN FLA TIO N
S tandard inflation pressures for tires are listed in the " Load
Capacity C hart" in Section O o f this manual. These are the
m inim um required tire pressures and tire sizes for m axim um
permissible loads. M inimum tire pressures for tires oth er than
those listed in the " Load Capacity C hart" can be determ ined
from the " Tire L oad and Inflation Pressure C h art" on the
following pages, using the weights shown on the vehicle GVW
plate.
The use o f im proper tire inflation pressures can affect tire
life and load carrying capacity, and may affect vehicle h an d ­
ling. Inflation pressures should be checked at least once a
m o nth (and preferably m ore o ften ) to insure th a t the right
am ou nt o f air is contained in the tires. W ith regard to tire life,
to o little air pressure allows abnorm al deflection o f th e tire
causing excessive operating tem peratures, while to o m uch air
pressure prevents norm al deflection, making th e cor,d body
m ore vulnerable to road impacts.
Use o f o ptional inflations is allowable only w ith a reduced
load as show n in the " Tire Load and Inflation Pressure C h art"
on the following page.
When operating at loads greater than th e optional reduced
load, th e inflation pressure m ust be increased to th e standard
inflation for full rated loads.
Tire Load and Inflation Pressure Notes
1. Tire inflation pressure may increase as m uch as
p er square inch (psi) w hen ho t.
2. F o r continous high speed operation, (over 75 m ph) w ith
passenger car typ e tires increase tire inflation pressure 4
Page
10-2
10-2
10-3
10-3
10-4
6
pounds
C H E V Y V A N SH O P M A N U A L