Chevrolet 1977 10 Series, Repair Manual, Page: 48 / 468

3B-6
OVERHAUL MANUAL
1. Side C over Screws 9. E xpansion Plug
17. W o rm Bearing Race—U pper
2. Lash A d ju s te r L o c k n u t 10. S teering Gear H ousing 18.
A d ju s te r Plug
3. Side C over and B ushing 11. P itm an S h a ft Seal 19. W o rm s h a ft Seal
4. Lash A d ju s te r S h im 12. W o rm B earing Race—L o w e r
20. A d ju s te r Plug L o c k n u t
5. Lash A d ju s te r Screw 13. W o rm B earing—L o w e r 21. C lam p S crew
6.
Side C over G asket
14. Ball N u t 22. Ball G u id e C lam p
7. P itm a n S h a ft
15. W o rm s h a ft
23. Balls
8. P itm a n S h a ft Bushings 16. W o rm B earing—U pper 24 Ball G uides
Fig. 3B-1 5--Steering G e a r- C o rv e t t e
b. Insert the wormshaft, nut and adjuster assembly into screw and shim but without side cover) into the housing so
the housing, guiding the lower end of the wormshaft into the that the center tooth of the pitm an shaft sector enters the
housing bearing.
c. Thread the adjuster into the housing until nearly all
end play is removed from the wormshaft.
5. Position the lash adjuster (with shim) in the slotted
end of the pitm an shaft. Check the end clearance, which
should not be greater than .002" (fig. 3B-16). If clearance is
greater than .002", a steering gear lash adjuster shim unit is
available. It contains four shims--.063", .065", .067" and
.069" thick.
6. Lubricate the steering gear with 11 oz. of lubricant
meeting G M Specification G M 4673 (or equivalent). R otate
the worm shaft until the ball nut is at the end of its travel and
then pack as m uch new lubricant into the housing as possible
without losing it out the pitm an shaft opening. R otate the
worm shaft until the ball nut is at the other end of its travel
and pack as m uch lubricant into the opposite end as possible.
7. Rotate the wormshaft until the ball nut is about in
the center of travel. This is to m ake sure that the pitm an shaft
sector and ball nut will engage properly, with the center tooth
of the sector entering the center tooth space in the ball nut.
8.
Insert the pitm an shaft assembly (with lash adjuster
Fig. 3B- 1 6 - C h e c k in g Lash A d j u s t e r End Cle a ran ce