Functional Check Buick Century VI

Functional Check

Position 1-2 support drum on bench. Install reaction sun gear assembly into 1-2 support drum. Rotate reaction sun gear counterclockwise. Rotate 1-2 support drum clockwise. (Scheme 111) Roller clutch should move freely in indicated directions. Roller clutch should lock in opposite direction. If roller clutch does not function as described, clutch is not assembled correctly. Reassemble as necessary.

Scheme 108

Scheme 109

Scheme 110

Scheme 111

Inspect 2-1 manual band for cracked, separated or worn friction material. Inspect for cracks around apply lugs. Replace components as necessary. (Scheme 83)

Inspect reaction sun gear and drum for the following

1. Worn or scored bushings.
2. Damaged reaction sun gear teeth.
3. Band apply area of drum for discoloration or wear.
4. Welds connecting sun gear to drum for voids or cracks.
5. Worn or damaged 1-2 support outer race.

Replace components as necessary. (Scheme 112)

Scheme 112

1. Using feeler gauge, check for excessive pinion gear end play in input carrier and reaction carrier assemblies. End play should be.009-.030" (.23-.76 mm). If end play is not as specified, replace appropriate component. (Scheme 113)
2. Inspect thrust bearings, reaction carrier and input carrier for the following: Damaged cage. Damaged or missing rollers. Damage to pinion teeth. Damage to internal gear teeth. Damage to spline teeth. Replace components as necessary. (Scheme 114)

Scheme 113

Scheme 114

1. Inspect for damaged 2nd clutch and reverse reaction drum splines. Original 2nd clutch and reverse reaction drums have splines with 25-degree sides and have tendency to strip. New design 2nd clutch and reverse reaction drum kit (GM P/N 24213402) have splines with 10-degree sides.
2. Inspect reverse reaction drum for cracks, damaged splines or distortion. (Scheme 75) Replace drum if necessary.

1. Remove input and 3rd sprag clutch assemblies from input clutch housing. (Scheme 115) Remove and discard spiral lock retaining ring from input clutch sprag outer race retainer. Remove 3rd clutch sprag assembly and input clutch sprag assembly from input and 3rd clutch sprag inner race. (Scheme 116) Remove input and 3rd clutch sprag inner race and input sun gear spacer from input sun gear.
2. Remove 3rd clutch sprag outer race retainer. Remove input and 3rd clutch sprag end bearings and input and 3rd clutch sprag center bearing from sprag outer races. Remove 3rd clutch and input clutch sprag assemblies from sprag outer races. (Scheme 117)

Inspect outer races for worn or damaged splines, scoring on inside diameter of races, wear or cracks. Inspect sprag components for flat spots. Inspect cage assemblies for distortion or broken ribbon tabs. Inspect end bearings and center bearing for cracks. Check input sun gear spacer for worn or damaged splines, or wear and cracks. Inspect input sun gear for worn or damaged splines or plugged lube holes or cracks. (Scheme 116)and (Scheme 117). Replace components as necessary.

1. Position input clutch sprag outer race on flat surface with flat side facing down. Insert end bearing with flat side down into input clutch sprag outer race. Insert input sprag into outer race. (Scheme 117)
2. Position 3rd clutch sprag outer race on flat surface with beveled side facing down. Install center bearing into 3rd clutch. Install 3rd sprag into 3rd clutch outer race. Lip on sprag cage must be facing up. Insert input and 3rd clutch sprag end bearing into third clutch sprag outer race with flat side up. (Scheme 117)
3. Install input clutch sprag assembly onto input and 3rd clutch sprag inner race with flat side of input clutch sprag outer race facing down. Install 3rd clutch sprag assembly onto input and 3rd clutch sprag inner race with beveled side of 3rd clutch sprag outer race facing input clutch sprag assembly. Install 3rd clutch sprag outer race retainer onto 3rd clutch sprag outer race. (Scheme 117)
4. Using small flat-blade screwdriver, install retaining ring onto input clutch sprag. Assemble spacer onto input sun gear. Install input and 3rd sprag clutch assemblies onto input sun gear. (Scheme 118)