GMC C-SERIES 1999 Owners Manual

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6-53
Then, follow the steps below for the wheels you have.
Cast
-Type Wheel
1. Put the tire and rim assembly on the axle hub.
2. Install the rim spacer at the rear.
3. Install the outer rear tire and rim assembly so that its
valve stem is exactly opposite the valve stem on the
inner tire and rim assembly.
4. Install the rim clamps and nuts. Position
them properly.
NOTICE:
If you tighten a nut when a rim clamp is not
positioned properly, it can damage the rim and
also cause the wheel to wobble in operation. Be
sure to position the rim clamps properly before
you go on to the next step.
5. Finger-tighten the nuts. Be sure that all of the wheel
clamps are seated all the way around the wheel.
6. Tighten all of the nuts using the following diagram.
Be sure to use the one that matches your wheels.
7. Now repeat Step 6, but this time tighten the nuts to
200 lb
-ft (271 N´m) of torque.
8. Turn the wheel and measure along the sidewall to see
how much wheel run
-out there is. There should be
no more than 1/8 inch (3 mm) on the front wheels
and 3/16 inch (5 mm) on the rear wheels. If there is
too much wheel run
-out, you can try loosening the
nuts on the side where there is the most run
-out and
tightening the opposite nuts. When you finally have
the tire running true, tighten all of the nuts to
200 lb
-ft (271 N´m).
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Stud-Piloted 10-Stud Wheel
The studs and nuts used on the right side of the vehicle
have right
-hand threads. Those used on the left side
have left
-hand threads. It is easy to tell by looking at the
nuts, because they are stamped R or L.
1. Put the tire and rim assembly on the axle hub.
2. Put on the wheel nuts. If you use oil or grease on the
wheel studs or nuts, the wheel nuts can't tighten
properly. This could let the wheel come off as you
are driving.
3. Finger
-tighten the nuts on the rear inner wheels and
the front wheels.
4. Tighten these nuts to 575 lb
-ft (780 N´m), unless
you have aluminum wheels and/or aluminum hubs.
If you have aluminum wheels and/or aluminum
hubs, tighten the nuts only to 475 lb
-ft (644 N´m).
Use the following diagram to do this.
Front or Inner Dual
WheelOuter Dual Wheel
5. Install the outer rear tire and rim assembly so that its
valve stem is exactly opposite the valve stem on the
inner tire and rim assembly.
6. Put on the wheel nuts.
7. Finger
-tighten the wheel nuts.
8. Tighten the nuts to the same torque numbers shown
in Step 4.
Whenever tightening both the inner and outer rear wheel
nuts, first loosen the outer wheel nuts. Then tighten the
inner nuts. Finally, tighten the outer nuts.
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CAUTION:
Never use oil or grease on studs or nuts. If you
do, the nuts might come loose. Your wheel could
fall off, causing a serious accident.
Hub-Piloted Wheels, 8-Hole or 10-Hole
The studs and nuts used with these wheels have
right
-hand threads.
1. With intermittent pilot pads, position a pad at
12 o'clock to center the wheel and reduce run
-out.
2. Put the tire and rim assembly on the axle hub. Install
the outer rear tire and rim assembly so that its valve
stem is exactly opposite the valve stem on the inner
tire and rim assembly.
3. Put on the wheel nuts.
4. Finger
-tighten the nuts.
5. Oil the surfaces between
the nuts and washers as
shown. Do not oil the
studs or the threads of
the nut.
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6-56
6. Tighten the nuts to
400 lb
-ft (542 N´m)
if an eight
-hole stud or
480 lb
-ft (650 N´m)
if a 10
-hole stud, use
the following diagrams.
8
-Hole
10-Hole
(Front or Inner Dual
Wheel)10-Hole
(Outer Dual Wheel)
CAUTION:
If wheel studs are damaged, they can break. If all
the studs on a wheel broke, the wheel could come
off and cause a serious crash. If any stud is
damaged because of a loose
-running wheel, it
could be that all of the studs are damaged. To be
sure, replace all studs on the wheel. If the stud
holes in a wheel have become larger, the wheel
could collapse in operation. Replace any wheel if
its stud holes have become larger or distorted in
any way. Inspect hubs and hub piloted wheels for
damage. Because of loose running wheels,
piloting pad damage may occur and require
replacement of the entire hub, for proper
centering of the wheels.
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CAUTION:
Rust or dirt on a wheel, or on the parts to which
it is fastened, can make the 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 the places where the
wheel attaches to the vehicle. In an emergency,
you can use a cloth or 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.
How Often to Check
Wheel tightness is so important you should have a
technician check nut tightness on all wheels with a
torque wrench every 1,000 miles (1 600 km).
When your vehicle is new or when a wheel or fastener is
new you should have a technician tighten the wheel
stud and rim clamp nuts, with a torque wrench, at
100, 500 and 1,000 miles (160, 800 and 1 600 km).
The reason for this is that the clamping system has to
seat before the fasteners will stay tightened.
Wheel Replacement
Replace any wheel that is bent, cracked or badly rusted.
If wheel nuts keep coming loose, replace the wheel.
If the wheel leaks air, replace it.
Your dealer will know the kind of wheel you need.
CAUTION:
A leaking wheel could fail without warning. A
wheel designed for tubeless tires could be leaking
because it is damaged. Don't use an inner tube or
some other thing to try to stop the leaking. Get a
new wheel of the proper type.
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CAUTION:
Without the correct wheel, you may not be able
to stop properly, and you could have other
problems like a tire air
-out. You could have a
collision. If you don't go to your dealer to get a
new wheel, be sure you get the correct one. Each
new wheel should match the original wheel in
load
-carrying capacity, inflation pressure
capacity, diameter, width, offset and mounting
configuration.
Using wheels and tires with higher load-carrying limits
than the original wheels and tires doesn't change the
GAWR or the GVWR of your vehicle.
NOTICE:
The wrong wheel can cause trouble in bearing
life, brake cooling, speedometer/odometer
calibration, headlamp aim, bumper height,
vehicle ground clearance, stopping distance and
tire clearance to the body and chassis. You could
also have other problems like a tire air
-out.
Used Replacement Wheels
CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can't know how it's been used or
how many miles it's been driven. It could fail
suddenly and cause an accident. If you have to
replace a wheel, use a new GM original
equipment wheel.
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Appearance Care
Remember, cleaning products can be hazardous. Some
are toxic. Others can burst into flame if you strike a
match or get them on a hot part of the vehicle. Some are
dangerous if you breathe their fumes in a closed space.
When you use anything from a container to clean your
vehicle, be sure to follow the manufacturer's warnings
and instructions. And always open your doors or
windows when you're cleaning the inside.
Never use these to clean your vehicle:

Gasoline

Benzene

Naphtha

Carbon Tetrachloride

Acetone

Paint Thinner

Turpentine

Lacquer Thinner

Nail Polish Remover
They can all be hazardous
-- some more than others --
and they can all damage your vehicle, too.Don't use any of these unless this manual says you can.
In many uses, these will damage your vehicle:

Alcohol

Laundry Soap

Bleach

Reducing Agents
Cleaning the Inside of Your Vehicle
Use a vacuum cleaner often to get rid of dust and loose
dirt. Wipe vinyl, leather, plastic and painted surfaces
with a clean, damp cloth.
Cleaning of Fabric/Carpet
Your dealer has two cleaners, Multi-Purpose Interior
Cleaner and Capture Non
-Solvent Dry Spot and Soil
Remover for cleaning fabric and carpet. They will clean
normal spots and stains very well. You can get
GM
-approved cleaning products from your dealer.
(See ªAppearance Care and Materialsº in the Index.)
Here are some cleaning tips:

Always read the instructions on the cleaner label.

Clean up stains as soon as you can
-- before they set.

Carefully scrape off any excess stain.
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6-60

Use a clean cloth or sponge, and change to a
clean area often. A soft brush may be used if stains
are stubborn.

If a ring forms on fabric after spot cleaning, clean the
entire area immediately or it will set.
Using Multi-Purpose Interior Cleaner
on Fabric
1. Vacuum and brush the area to remove any loose dirt.
2. Always clean a whole trim panel or section. Mask
surrounding trim along stitch or welt lines.
3. Mix powdered cleaner following the directions on
the container label to form thick suds.
4. Use suds only and apply with a clean sponge. Don't
saturate the material and don't rub it roughly.
5. As soon as you've cleaned the section, use a sponge
to remove the suds.
6. Wipe cleaned area with a clean, damp towel or cloth.
7. Wipe with a clean cloth and let dry.
Special Fabric Cleaning Problems
Stains caused by such things as catsup, coffee (black),
egg, fruit, fruit juice, milk, soft drinks, vomit, urine and
blood can be removed as follows:
1. Carefully scrape off excess stain, then sponge the
soiled area with cool water.
2. If a stain remains, follow the multi
-purpose interior
cleaner instructions described earlier.
3. If an odor lingers after cleaning vomit or urine,
treat the area with a water/baking soda solution:
1 teaspoon (5 ml) of baking soda to 1 cup (250 ml)
of lukewarm water.
4. Let dry.
Stains caused by candy, ice cream, mayonnaise, chili
sauce and unknown stains can be removed as follows:
1. Carefully scrape off excess stain.
2. First, clean with cool water and allow to
dry completely.
3. If a stain remains, follow instructions for
Multi
-Purpose Interior Cleaner.
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6-61 Fabric Protection
Your vehicle has upholstery that has been treated with
Scotchgard Fabric Protector, a 3M product. It protects
fabrics by repelling oil and water, which are the carriers
of most stains. Even with this protection, you still need
to clean your upholstery often to keep it looking new.
Further information on cleaning is available by calling
1
-800-433-3296 (in Minnesota, 1-800-642-6167).
Cleaning Vinyl
Use warm water and a clean cloth.

Rub with a clean, damp cloth to remove dirt. You
may have to do it more than once.

Things like tar, asphalt and shoe polish will stain
if you don't get them off quickly. Use a clean cloth
and a vinyl/leather cleaner. See your dealer for
this product.
Cleaning the Top of the Instrument Panel
Use only mild soap and water to clean the top surfaces
of the instrument panel. Sprays containing silicones or
waxes may cause annoying reflections in the windshield
and even make it difficult to see through the windshield
under certain conditions.
Cleaning Interior Plastic Components
Use only a mild soap and water solution on a soft
cloth or sponge. Commercial cleaners may affect the
surface finish.
Care of Safety Belts
Keep belts clean and dry.
CAUTION:
Do not bleach or dye safety belts. If you do, it
may severely weaken them. In a crash, they
might not be able to provide adequate protection.
Clean safety belts only with mild soap and
lukewarm water.
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Cleaning Glass Surfaces
Glass should be cleaned often. GM Glass Cleaner or a
liquid household glass cleaner will remove normal
tobacco smoke and dust films on interior glass. (See
ªAppearance Care and Materialsº in the Index.)
Don't use abrasive cleaners on glass, because they may
cause scratches. Avoid placing decals on the inside rear
window, since they may have to be scraped off later.
Cleaning the Outside of the
Windshield and Wiper Blades
If the windshield is not clear after using the windshield
washer, or if the wiper blade chatters when running, wax,
sap or other material may be on the blade or windshield.
Clean the outside of the windshield with GM Windshield
Cleaner, Bon Ami

Powder (non-scratching glass
cleaning powder), GM Part No. 1050011. The windshield
is clean if beads do not form when you rinse it
with water.Grime from the windshield will stick to the wiper blades
and affect their performance. Clean the blade by wiping
vigorously with a cloth soaked in full
-strength
windshield washer solvent. Then rinse the blade
with water.
Check the wiper blades and clean them as necessary;
replace blades that look worn.
Weatherstrips
Silicone grease on weatherstrips will make them last
longer, seal better, and not stick or squeak. Apply
silicone grease with a clean cloth at least every six
months. During very cold, damp weather more frequent
application may be required. (See ªRecommended
Fluids and Lubricantsº in the Index.)
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