GM Century/Lumina/Grand Prix/Intrigue 1997-2000

Wheels

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Fig. Tire identification and metric tire size explanation

REMOVAL & INSTALLATION





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Fig. Most W-Body vehicles have metal or plastic cosmetic covers over the wheel lug nuts. Use a deep socket to unscrew the lug nut cover



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Fig. With the metal or plastic cosmetic cover removed, use a 1 / 2 inch breaker bar and a deep socket to remove the lug nut



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Fig. Note that the wheel lug nut has external threads to accept a screw-on cosmetic cover



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Fig. Note how the cosmetic plastic cover threads onto the steel wheel retaining nut



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Fig. Use a torque wrench for final wheel lug nut tightening. Proper torque protects styled alloy wheels and helps prevent distortion of the brake rotor which could cause brake pedal pulsation

  1. If equipped, remove the hub cap/wheel cover.
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  3. Many GM W-Body vehicles use styled wheels with cosmetic covers over the wheel retaining nuts (also called lug nuts). Some models may use bright-finished metal caps, others may use a black plastic cap. Use a deep socket to unscrew these cosmetic covers.
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  5. With the vehicle still on the ground, use a deep socket and a suitable breaker bar or ratchet to break loose, but do not unscrew the lug nuts.
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  7. Raise and safely support the vehicle.
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NOTE
Always use a suitable floor jack for raising the vehicle to be serviced. Never use the jacking device supplied with the vehicle for vehicle service. That jacking device is designed for emergency use only to change a flat tire.

  1. Remove the wheel lug nuts.
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  3. Since the tire and wheel assemblies were originally balanced as an assembly on the vehicle and since many professional tire shops may spin balance a tire and wheel assembly while mounted on the vehicle (so the brake rotor and hub are also included in the balance computation), a tire and wheel assembly should always be installed in the same location as removed. Mark the location of the tire and wheel to the hub. Many technicians will chalk the end of the topmost wheel stud and place a another chalk mark on the corresponding wheel opening. In this way, the tire and wheel assembly can be installed in the same relationship as when removed.
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  5. Remove the tire and wheel assembly.
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To install:


CAUTION
Before installing a wheel, remove any build-up of corrosion on the wheel mounting surface or brake rotor, by scraping and wire brushing. Installing wheels without good metal-to-metal contact at the mounting surfaces can cause the wheel lug nuts to loosen, which may allow the wheel to come off while the vehicle is in motion.

  1. Clean the wheel nuts, studs and the wheel and rotor mounting surfaces.
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  3. Install the tire and wheel assembly aligning the locating marks made at removal.
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CAUTION
Never use oil or grease on studs or nuts.

  1. Tighten the wheel lug nuts by hand until they are snug. Then tighten the nuts in a 'star-shape' sequence, as shown in the accompanying figure, and torque to specification. Improperly tightened wheel lug nuts could eventually allow the wheel to come off while the vehicle is moving, possibly causing loss of control, personal injury and property damage.
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Fig. "Star" lug nut tightening sequence

  1. Tighten the lug nuts finger-tight. Then tighten in sequence to 100 ft. lbs. (140 Nm). Use of a torque wrench is important. Aluminum wheels will distort under uneven wheel lug nut pressure. Unequal torque can also distort brake rotors, causing uneven brake wear and pulsations in the brake pedal.
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  3. Install the hub cap, if equipped. Install the lug nut cosmetic covers, if equipped.
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  5. Lower the vehicle. With the vehicle on the ground, recheck the wheel lug nut torque.
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Servicing Difficult To Remove Wheels

General Motors says that penetrating oil has not been found to effective in removing tight wheels. However, if it is to be used, it should be applied sparingly to the hub surface only.


CAUTION
If penetrating oil gets on the vertical surfaces between the wheel and the rotor or drum, it could cause the wheel to work loose as the vehicle is driven, resulting in loss of control and an injury accident. Never use heat to loosen a tight wheel. It can shorten the life of the wheel, studs or hub nut and bearing. Wheel nuts must be tightened in sequence and to the proper torque to avoid bending the wheel or rotor.

Excessive force such as hammering the wheel or tire can also cause damage. Use a rubber mallet to lightly tap the tire's sidewall. Sometimes wheels can be difficult to remove from the vehicle due to foreign material or a tight fit between the wheel center hole and the hub or rotor. These wheels can be removed without damage as follows:

  1. Tighten all wheel nuts on the affected wheel, then loosen each wheel nut two turns.
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  3. Lower the vehicle to the floor.
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  5. Rock the vehicle from side to side as hard as possible using one or more person's body weight to loosen the wheel, and/or rock the vehicle from DRIVE to REVERSE, allowing it to move several feet in each direction. Apply quick, hard jabs on the brake pedal to loosen the wheel.
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CAUTION
Before installing a wheel, remove any build-up of corrosion on the wheel mounting surface or rotor, by scraping and wire brushing. Installing wheels without good metal-to-metal contact at mounting surfaces can cause wheel nuts to loosen, which may later allow the wheel to come off while the vehicle is in motion. Never use oil or grease on studs and nuts. Tighten the wheel nuts with your fingers until they are snug. Then tighten the nuts in a "star" pattern. The wheel nut torque specification for these vehicles is 100 ft. lbs. (140 Nm). Improperly tightened wheel nuts could eventually allow the wheel to come off while the vehicle is moving, possibly causing loss of control, personal injury and property damage.

INSPECTION



Inspect the tread for abnormal wear, check for nails or other foreign material embedded into the tire. To check for leaks, submerse the wheel assembly into a tub of water and watch for air bubbles.

Wheels must be replaced if they are bent, dented, leak air through welds, have elongated bolt holes, if wheel nuts won't stay tight, or if the wheels are heavily rusted. Replacement wheels must be equivalent to the original equipment wheels in load capacity, diameter, rim width, offset, and mounting configuration.

A wheel of improper size may affect wheel bearing life, brake cooling, speedometer/odometer calibration, vehicle ground clearance and tire clearance to the body and/or chassis.


NOTE
Replacement with used wheels is not recommended as their service history may have included severe treatment or very high mileage and they could fail without warning.

Check runout in all directions (up and down, in and out) using a dial indicator. For aluminum wheels, maximum runout is 0.030 in. (0.762mm) For steel wheels, the specification is 0.045 in. (1.143mm). If the wheel causes a vibration and tire balance does not solve the problem, replace the wheel.

 
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