GMC 1982 Light Duty Truck Service Manual page 413

Fig. 4A-24--lnstalling Tool J-23996 Over Ball
2. Clean and inspect seal and ball seats along with spring
and washers. If any parts show indication of excessive
wear or are broken, replace the entire set with a service
kit.
Whenever the seal is removed to inspect ball seat parts,
it should be discarded and replaced with a new seal.
3. Remove all plastic from groove of coupling yoke.
4. Inspect the centering ball surface. If it shows signs of
wear beyond smooth polish, replace it.
Centering Ball Replacement
1. Place fingers of inner part of Tool J-23996 under ball as
shown in figure 4A-24.
2. Place outer cylinder of Tool J-23996 over outside of
ball as shown in figure 4A-25.
3. Thread nut on Tool J-23996 and draw ball off stud,
using wrench as shown in figure 4A-27.
4. Place the replacement ball on stud.
5. Using Tool J-23996, drive ball onto stud as in
Fig. 4 A -2 5 — Installing O uter Cylinder o f Tool J-23996 O ver Ball
Fig. 4A-26-Removing Centering Ball
figure 4A-27, until the ball can be seen to seat firmly
against the shoulder at the base of the stud. This is
important as the center of the double C ardan joint is
determined by the ball seating tightly in the proper
location.
6. Using grease provided in the ball seat kit, lubricate all
parts and insert them into the clean ball seat cavity in
the following order: spring, washer (smallest O D ),
three ball seats (with largest opening outw ard to
receive ball), washer (largest OD) and seal.
7. L u bricate seal lip and press seal flush with Tool
J-23694, as shown in figure 4A-28. Sealing lip should
tip inward.
8. Fill cavity with grease provided in kit.
9. Install flange yoke to centering ball as shown in figure
4A-29, making sure alignment marks are correctly
positioned. Install trunnion and bearing caps as
previously outlined.
Fig. 4 A -2 7 -ln sta llin g Centering Ball
PROPELLER SHAFT 4 A -1 1