GM Grand Am/Achieva/Calais/Skylark/Somerset 1985-98

Wheel Assembly

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REMOVAL & INSTALLATION



See Figures 1, 2 and 3

  1. Park the vehicle on a level surface.
  2.  
  3. Remove the jack, tire iron and, if necessary, the spare tire from their storage compartments.
  4.  
  5. Check the owner's manual or refer to Routine Maintenance of this information for the jacking points on your vehicle. Then, place the jack in the proper position.
  6.  
  7. If equipped with lug nut trim caps, remove them by either unscrewing or pulling them off the lug nuts, as appropriate. Consult the owner's manual, if necessary.
  8.  
  9. If equipped with a wheel cover or hubcap, insert the tapered end of the tire iron in the groove and pry off the cover.
  10.  
  11. Apply the parking brake and block the diagonally opposite wheel with a wheel chock or two.
  12.  

Wheel chocks may be purchased at your local auto parts store, or a block of wood cut into wedges may be used. If possible, keep one or two of the chocks in your tire storage compartment, in case any of the tires has to be removed on the side of the road.

  1. If equipped with an automatic transaxle, place the selector lever in P or Park; with a manual transmission/transaxle, place the shifter in Reverse.
  2.  
  3. With the tires still on the ground, use the tire iron/wrench to break the lug nuts loose.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: A locking lug nut may be used on your model; check before removing the other lug nuts



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Fig. Fig. 2: A special key is required for locking lug nuts

If a nut is stuck, never use heat to loosen it or damage to the wheel and bearings may occur. If the nuts are seized, one or two heavy hammer blows directly on the end of the bolt usually loosens the rust. Be careful, as continued pounding will likely damage the brake drum or rotor.

  1. Using the jack, raise the vehicle until the tire is clear of the ground. Support the vehicle safely using jackstands.
  2.  
  3. Remove the lug nuts, then remove the tire and wheel assembly.
  4.  

To install:
  1. Make sure the wheel and hub mating surfaces, as well as the wheel lug studs, are clean and free of all foreign material. Always remove rust from the wheel mounting surface and the brake rotor or drum. Failure to do so may cause the lug nuts to loosen in service.
  2.  
  3. Install the tire and wheel assembly and hand-tighten the lug nuts.
  4.  
  5. Using the tire wrench, tighten all the lug nuts, in a crisscross pattern, until they are snug.
  6.  
  7. Raise the vehicle and withdraw the jackstand, then lower the vehicle.
  8.  
  9. Using a torque wrench, tighten the lug nuts in a crisscross pattern to 100-103 ft. lbs. (136-141 Nm).
  10.  



Click image to see an enlarged view

Fig. Fig. 3: Typical wheel lug tightening sequence


WARNING
Do not overtighten the lug nuts, as this may cause the wheel studs to stretch or the brake disc (rotor) to warp.

  1. If so equipped, install the wheel cover or hubcap. Make sure the valve stem protrudes through the proper opening before tapping the wheel cover into position.
  2.  
  3. If equipped, install the lug nut trim caps by pushing them or screwing them on, as applicable.
  4.  
  5. Remove the jack from under the vehicle, and place the jack and tire iron/wrench in their storage compartments. Remove the wheel chock(s).
  6.  
  7. If you have removed a flat or damaged tire, place it in the storage compartment of the vehicle and take it to your local repair station to have it fixed or replaced as soon as possible.
  8.  

INSPECTION



Inspect the tires for lacerations, puncture marks, nails and other sharp objects. Repair or replace as necessary. Also check the tires for treadwear and air pressure as outlined in Routine Maintenance of this information.

Check the wheel assemblies for dents, cracks, rust and metal fatigue. Repair or replace as necessary.

REPLACEMENT



Front Wheels

See Figures 4 and 5

  1. Remove the tire and wheel assembly.
  2.  
  3. As described later in this section, remove the hub and bearing assembly.
  4.  
  5. Using tool J 6627-A or equivalent wheel stud remover tool, remove and discard the wheel stud(s).
  6.  



Click image to see an enlarged view

Fig. Fig. 4: Once the hub and bearing is removed from the vehicle, use the proper tool to remove the wheel stud(s)

To install:
  1. Insert the new stud from the rear of the hub.
  2.  
  3. Install flat washers and nut (flat side down), onto the wheel stud, then tighten until the wheel stud is fully seated.
  4.  

Use a light oil on the washers and nut to ease the installation procedure.



Click image to see an enlarged view

Fig. Fig. 5: Install washers and a nut on the wheel stud, then tighten until the stud is properly seated

  1. Remove the nut and washers.
  2.  
  3. Install the hub and bearing assembly as outlined later in this section.
  4.  
  5. Install the tire and wheel assembly.
  6.  

See Figures 4 and 5

  1. Remove the tire and wheel assembly.
  2.  
  3. Remove the brake drum, then remove the hub and bearing assembly. For details, please refer to the procedure located later in this section.
  4.  
  5. Unfasten and remove the wheel stud(s) using tool J 6627-A or an equivalent wheel stud removal tool. Discard the removed stud(s).
  6.  
  7. If a socket is used, place it over the back portion of the stud. Position a clamp over the assembly and apply pressure to pop the stud out.
  8.  

To install:
  1. Insert the new stud from the rear of the hub.
  2.  
  3. Install 4 flat washers onto the stud.
  4.  
  5. Install the wheel nut with the flat side toward the washers.
  6.  
  7. Tighten the nut until the stud head is properly seated in the hub flange.
  8.  

Use a light oil on the washers and nut to ease installation.

  1. Remove the nut and washers.
  2.  
  3. Install the hub and bearing assembly and the brake drum.
  4.  
  5. Install the tire and wheel assembly.
  6.  

 
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