Parts & Service Procedure Information
PARTS INFORMATIONParts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To ensure these parts will be obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. order, with NO special instruction code, but on an advise code (2).
NOTICE: Parts must be ordered according to VIN range. Be certain to check the VIN of the vehicle being serviced to obtain the correct parts. Refer to the Vehicles Involved section of this bulletin.
VIN Range Part Number Description Quantity
Group 1 3634775 Service Kit* 1
7466961 Hub & Bearing Assy As Required**
14084119 Bearing Seal As Required**
22529144 Brake Caliper Bolt As Required
(two per Hub and Bearing Assembly)
Group 2 14035592 Torque Prevailing Nut 2
10049691 Large Washer 2
* NOTICE: Each Service Kit contains 2 splined washer adapters, 2 washers, 2 torque prevailing nuts and 2 nut retainers for servicing both the left and right front drive axles.
**NOTICE: It is anticipated that less than 10% of the hub and bearing
assemblies within the Group 1 VIN ranges will require replacement. Bearing assemblies are not included in the Service Kit and must be ordered separately. Please adjust your parts orders accordingly. Vehicles within the Group 2 VIN range should not require any wheel bearing assembly replacements.
SERVICE PROCEDURE (Applies to both left and right front drive axles)
Group 1 (Riviera KU400001-KU401763 and Reatta KB900001-KB901034)
1. Support front of vehicle. Lift vehicle enough to removal most of the weight of the vehicle from the ground, but keep the tires on the ground to prevent rotation during torque readings.
2. Remove front wheel covers or wheel inserts.
3. Loosen drive axle nut one-sixth turn (one flat).
4. Tighten nut to original position.
5. Check and record torque to re-loosen drive axle nut.
ILLUSTRATION # 2:
Group 2 (Riviera KU401764-KU403487 and Reatta KB901035-KB901911)
1. Support front of vehicle. Lift vehicle enough to remove most of the weight of the vehicle from the ground, but keep the tires on the ground to prevent rotation during torque readings.
2. Remove front wheel covers or wheel inserts.
3. Remove drive axle nut and washer and discard.
NOTICE: For Steps 4 and 5, refer to Illustration # 2.
4. Install new washer (part number 10049691).
5. Install new torque prevailing nut (part number 14035592) and torque to 245 N-m (180 ft. lbs.).
IMPORTANT: Use torque wrench to tighten drive axle nut to specification.
6. Install front wheel covers or wheel inserts.
7. Remove support from front of vehicle.
8. Install Campaign Identification Label.
ILLUSTRATION # 1:
6. If torque in Step 5 is below 80 N-m (60 ft. lbs.) replace hub and bearing assembly and seal per 1989 Reatta Riviera Service Manual procedure, Pages 3C-6 through 8.
NOTICE: If a hub and bearing assembly is replaced, the two brake caliper bolts (part number 22529144) MUST also be replaced (see Notice on Page 5B3-1 of Service Manual).
7. Remove original drive axle nut and washer and discard.
NOTICE: For Steps 8 through 11 refer to Illustration # 1 and use Service Kit Part Number 3634775.
8. Install splined washer adaptor.
9. Install new washer.
10. Install new torque prevailing nut and torque to 245 N-m. (180 ft. lbs.).
IMPORTANT: Use torque wrench to tighten drive axle nut to specification.
11. Install nut retainer over nut and be certain that the three tabs latch into the three notches in the splined washer adaptor. If tabs and notches do not align, tighten nut further to align. Do not exceed 275 N-m. (200 ft. lbs.)
12. Install front wheel cover or wheel insert.
13. Remove support from front of vehicle.
14. Install Campaign Identification Label.