wheel GMC JIMMY 1997 Repair Manual

Four-wheel Drive and
All-Wheel Drive
Most lubricant checks in this section also apply to
four-wheel-drive vehicles. However, they have two
additional systems that need lubrication.
Transfer Case
When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. See "Periodic Maintenance
Inspections"
in the Index.
How. to Check Lubricant
If the level is below the bottom of the filler plug hole,
you'll need to add some lubricant. Add enough lubricant
to raise the level
to the bottom of the filler plug hole.
What to Use
Refer to the Maintcnance Schedule to determine what
kind of lubricant to use. See "Recommended Fluids and
Lubricants" in the Index.
6-21

Brake Wear
Your vehicle has front disc brakes and rear drum brakes.
If you have the all-wheel drive option, your vehicle has
four-wheel disc brakes.
Disc brake pads have built-in wear indicators that make
a
high-pitched warning sound when the brake pads are worn
and new pads are needed.
The sound may come and go or
be heard all the time your vehicle is moving (except when
you are pushing on the brake pedal firmly).
I A CAUTION: I
The brake wear warning sound means that soon
your brakes won't
work well. That could lead to
an accident. When you hear the brake wear
warning
sound, have your vehicle serviced.
NOTICE:
Continuing to drive with worn-out brake pads
could result in costly brake repair.
Some driving conditions or climates may cause a brake
squeal when the brakes are first applied or lightly
applied. This does not mean something is wrong
with
your brakes.
Properly torqued wheel nuts are necessary to help
prevent brake pulsation. When tires are rotated, inspect
brake
pads for wear and evenly torque wheel nuts in the
proper sequence to
GM specifications.
Your rear
drum brakes don't have wear indicators,
but
if you ever hear a rear brake rubbing noise: have
the rear brake linings inspected. Also, the rear brake
drums should be removed and inspected each time the
tires are removed
for rotation or changing. When you
have the front brake pads replaced. have the rear brakes
inspected, too.
Brake linings should always be replaced as complete
axle sets.
See
"Brake System Inspection" in Section 7 of this manual
under
Part C "Periodic Maintenance Inspections."
6-31

I NOTICE: (Continued) I
If your tires have too much air (overinflation),
you
can get the following:
0 Unusual wear
0 Bad handling
0 Rough ride
Needless damage from road hazards.
When to Check
Check your tires once a month or n101-e. Also. check the
tire pressure
of the spare tire.
I! you have a compact spare tire. it should be at 60 psi
(420
k Pa).
How to Check
Use a good quality pocket-type gage to check tire
pressure. You can't tell
if your tires are properly inflated
simply
by looking at thcm. Radial tires may look
properly inflated even when they're underintlatecl.
Be sure to put the valve caps back on the valve stems.
They help prevent leaks
by keeping out dirt and moisture.
Tire Inspection and Rotation
Tires s11o111d be rotated every 6,000 to 8,000 miles
( IO 000 to 13 000 km). Any time you notice unusual
we;^. rotate your tires as soon as possible and check
wheel alignment.
Also check for damaged tires or
wheels. See "When 1t.s Time for New Tires" and
"Wheel Replacement" later
in this section for
more information.
Thc purpose
of' reg~~lar rotation is to achieve more
uniform wear
fur all tires on the vehicle. The first
rotation
is thu most important. See "Schecluled
Maintenance Services"
in the Index for scheduled
rotation intervals.
r --
6-42

I1
If your vehicle has a compact spare tire, don’t include it
in your tire rotation.
After the tires have been rotated, adjust the front and
rear inflation pressures as shown on the
Certificatioflire label. Make certain that all wheel nuts
are properly tightened. See “Wheel Nut Torque’’ in
the Index.
Rust or dirt on a wheel, or on the parts to which
it is fastened, can make wheel nuts become loose
after a time. The wheel could come
off and cause
an accident. When you change a wheel, remove
any rust or dirt from places where the wheel
attaches to the vehicle.
In an emergency, you can
use a cloth or a paper towel to do this; but be
sure to use a scraper or wire brush later, if you
need to, to get all the rust or dirt
off. (See
“Changing a Flat Tire” in the Index.)
6-43

Mixing tires could cause you to lose control while
driving.
If you mix tires of different sizes or types
(radial and bias-belted tires), the vehicle may not
handle properly, and you could have
a crash.
Using tires
of different sizes may also cause
damage to
your vehicle. Be sure to use the same
size and type tires
on all wheels.
It’s all right to drive with your compact spare
(if you have one). It was developed for
use on
your vehicle.
Uniform Tire Quality Grading
The following information relates to the system
developed
by the United States National Highway
Traffic Safety Administration, which grades tires by
treadwear. traction and temperature performance. (This
applies only to vehicles
sold in the United States.) The
grades are molded on the sidewalls of most passenger
car tires. The Uniform Tire Quality Grading system does not
apply to deep tread, winter-type snow tires,
space-saver or temporary use spare tires, tires with
nominal
rim diameters of 10 to 12 inches (25 to 30 cm),
or to some limited-production tires.
While the tires available on General Motors passenger
cars and light trucks may vary
with respect to these
requirements and additional General Motors Tire
Performance Criteria (TPC) standards.
c Urades, they rnust also conform to Federal safety
Treadwear
The treadwear grade is a comparative rating based
on
the wear rate of the tire when tested under controlled
conditions on
a specified government test course. For
example.
a tire graded 150 would wear one and a half
( 1 1/2) times as well on the government course as a tire
upon the actual conditions of their use, however, and
may depart significantly from the norm due to variations
in driving habits, service practices and differences in
road characteristics and clilnate.
e oraded 100. The relative performance of tires depends
6-45

Traction -- A, B, C
The tmction grades, from highest to lowest. are A, B. and
C, and they represent the tire‘s ability to stop on wet
pavement
as measured under controlled conditions on
specified government test surfaces of asphalt and concrete.
A tire marked C may have poor traction perf’ormance.
Wxning: The traction grade assigned
to this tire is based
on braking (straight ahead) traction tests and does not
include cornering (tuning) traction.
Temperature -- A, B, C
The temperature grades are A (,the highest), B, and C.
representing the tire‘s resistance to the gencration of
heat and its ability to dissipate heat when tested undcr
controlled conditions
on a specified indoor laboratory
test wheel. Sustained high temperature can cause
the
material of the tire to degenerate and reduce tire life,
and excessive temperature can lead to sudden tire
failure. The grade
C corresponds to a level of
performance which all passenger car tires must meet
under the Federal Motor Vehicle
Safety Standard
No. 109. Grades B and A represent higher levels of
performance
on the laboratory test wheel than the
minimum required
by law.
Warnin?: Thc ten~perat~u-e pxde for this tire is
estnblishcd for a tire that is properly intlated and not
overloaded. Excessive speed. underinflation, or
excessive loading. either separatcly or in combination.
c;m ca~~se heat buildup
md possible tire failure.
Wheel Alignment and Tire Balance
The wheels on your vehicle were aligned and balanced
care1’uIly at the factory to give you the longest tire life
and best overdl performance.
lee1 Replacement
~epl~e ;my wheel that is bent. cracked, or badly rusted
01- corrocled. If wheel n~~ts keep coming loose. the wheel,
wheel bolts and wheel nuts should be 1-eplacec1.
If the
wheel leaks air, replace it (except some aluminum
wheels. which cm sometimes be repaired). See your
GM dcalcr if any of’ these conditions exist.
6-46

Each new wheel should have the same load-carrying
capacity, diameter. width. offset and
be mounted the
same way as the one it replaces.
If you need to replace any of your wheels, wheel bolts
or wheel nuts. replace them only with new GM original
equipment parts. This way.
you will be sure to have the
right wheel. wheel bolts
and wheel nuts for your vehicle.
I
A CAUTION: r)
Using the wrong replacement wheels, wheel bolts
or wheel nuts on your vehicle can be dangerous.
It could affect the braking and handling of your
vehicle, make your tires lose
air and make you
lose control. You could have a collision in which
you or others could be injured.
Alwrays use the
correct wheel, wheel
bolts and wheel nuts
for replacement.
NOTICE:
The wrong wheel can also cause problems with
bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper
height, vehicle ground clearance and tire or tire
chain clearance
to the body and chassis.
~~ ,.
See "Changing a Flat Tire" in the Index for
more information.
Used Replacement Wheels
'
A CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can't know how it's been used or
how
far it's been driven. It could fail suddenly
and cause an accident.
If you have to replace a
wheel, use
a new GkI original equipment wheel.
6-47

Tire Chains
NOTICE:
If your vehicle has P235/75R15, P235/70K15 or
31xlOSOR15LT/C size tires, don’t use tire chains.
They can. damage your vehicle because there’s
not enough clearance.
Use another type of traction device only
if its
manufacturer recommends it for use on your vehicle and tire size combination and road
conditions. Follow that manufacturer’s
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it’s contacting your vehicle, and don’t
spin your wheels.
NOTICE: (Continued)
NOTICE: (Continued)
If you do hd a traction device that will fit, install
them on the rear tires.
If you have other size tires, use tire chains only
where legal and only when you must. Use only
SAE Class “S” type chains that are the proper
size for your tires. Install them on the drive axle
tires (,four-wheel-drive vehicles can use chains on both axles) and tighten them as tightly
as possible
with the ends securely fastened. Drive slowly and
follow the chain manufacturer’s instructions.
If
you can hear the chains contacting your vehicle,
stop and retighten them.
If the contact continues,
slow down until it stops. Driving
too fast or
spinning the wheels with
chains on will damage
your vehicle.
6-48

Exterior painted surfaces are subject to aging, weather
and chemical fdlout that can take their
toll over a period
of years. You can help to keep the paint finish looking
new by keeping your vehicle garaged or covered
whenever possible.
Protecting Exterior Bright Metal Parts
Bright metal parts should be cleaned regularly to keep
their luster. Washing
with water is all that is usually
needed. However. you may use chrome polish on
chrome or stainless steel trim.
if necessary.
Use special care
with aluminum trim. To avoid
damaging protective
trim, never use auto or chrome
polish, steam or caustic
soap to clean aluminum. A
coating of wax, rubbed to high polish, is recommended
for
all bright metal parts.
Cleaning Aluminum Wheels
(If Equipped)
Keep your wheels clean wing a soft clean cloth with
mild
soap and water. Rinse with cle.an water. After
rinsing thoroughly,
dry with a soft clean towel. A wax
may then be applied. The surface
of these wheels
is similar to the painted
surface of your vehicle. Don't use strong soaps.
chemicals, abrasive polishes, abrasive cleaners or
abrasive cleaning brushes on then1 because you could
damage the surface.
Don't take your vehicle through an automatic car wash
that has silicon carbide tire cleaning brushes. These
brushes can
also damage the surface of these wheels.
Cleaning Tires
To clean YOLK tires, use a stiff brush with a tire cleaner.
NOTICE:
When applying a tire dressing always take care to
wipe off any overspray or splash from all painted
surfaces
on the body or wheels of the vehicle.
Petroleum-based products may damage the paint finish.
Sheet Metal Damage
If your vehicle is damaged and requires sheet metal
repair
or replacement, make sure the body repair shop
applies anti-corrosion material to the parts repaired or
replaced
to restore corrosion protection.
6-55

,I,, WDO >- ACCY
Fuse/Circuit Breaker
Usage
A Power Door Locks, Power Seat,
Power Seat Lumbar, Remote Keyless Entry
Power Windows, Sunroof
Modde/Motor
B
Fuse/Circuit
Breaker Usage
1
2
3
4
Stoplamps, Hazard Lamps, Chime,
Center High-Mounted Stoplamp Relay,
Center High-Mounted Stoplamp
Dome Lamps, Cargo Lamps, Visor
Vanity Mirror, Cigarette Lighter,
Inside Rearview Mirror Lamp,
Overhead Console L,amps, Glove
Box Lamp, Horns, Horn Relay, IP
Courtesy Lamps, Power Outside
Rearview Mirror, Liftglass Release
Motor, Illuminated Entry Module
Parking Lamps, License Plate Lamps,
Electric Shift Transfer Case Module,
Underhood Lamp, Rear Wiper,
Fog
Lamp Relay, Door Switch Lamp,
Ashtray Lamp, Headlamp Switch
A/C Compressor Relay, Cluster
Chime Module. DRL Relay Coil,
Four-Wheel-Drive Indicator Lamp,
DRL Module, Rear
Defog Timer,
Transfer Case Control Module
Ignition, SIR Redundant Ignition,
RKE Ignition. Fuel Sender Module
6-60